README.md · plaknight/type-challenge

Collection of TypeScript type challenges

English | <a href='./README.zh-CN.md'>简体中文</a> | <a href='./README.ja.md'>日本語</a> | <a href='./README.ko.md'>한국어</a>

## Intro

<del>by the power of TypeScript's well-known <a href="https://github.com/microsoft/TypeScript/issues/14833">Turing Completed</a> type system</del>

High-quality types can help improve projects' maintainability while avoiding potential bugs.

There are a bunch of awesome type utility libraries may boost your works on types, like [ts-toolbelt](https://github.com/millsp/ts-toolbelt), [utility-types](https://github.com/piotrwitek/utility-types), [SimplyTyped](https://github.com/andnp/SimplyTyped), etc., which you can already use.

This project is aimed at helping you better understand how the type system works, writing your own utilities, or just having fun with the challenges. We are also trying to form a community where you can ask questions and get answers you have faced in the real world - they may become part of the challenges!

## Challenges

> Click the following badges to see details of the challenges.

<img src="https://img.shields.io/badge/warm--up-1-teal" alt="1"/> <a href="./questions/13-warm-hello-world/README.md" target="_blank"><img src="https://img.shields.io/badge/-13%E3%83%BBHello%20World-teal" alt="13・Hello World"/></a> <img src="https://img.shields.io/badge/easy-13-7aad0c" alt="13"/> <a href="./questions/4-easy-pick/README.md" target="_blank"><img src="https://img.shields.io/badge/-4%E3%83%BBPick-7aad0c" alt="4・Pick"/></a> <a href="./questions/7-easy-readonly/README.md" target="_blank"><img src="https://img.shields.io/badge/-7%E3%83%BBReadonly-7aad0c" alt="7・Readonly"/></a> <a href="./questions/11-easy-tuple-to-object/README.md" target="_blank"><img src="https://img.shields.io/badge/-11%E3%83%BBTuple%20to%20Object-7aad0c" alt="11・Tuple to Object"/></a> <a href="./questions/14-easy-first/README.md" target="_blank"><img src="https://img.shields.io/badge/-14%E3%83%BBFirst%20of%20Array-7aad0c" alt="14・First of Array"/></a> <a href="./questions/18-easy-tuple-length/README.md" target="_blank"><img src="https://img.shields.io/badge/-18%E3%83%BBLength%20of%20Tuple-7aad0c" alt="18・Length of Tuple"/></a> <a href="./questions/43-easy-exclude/README.md" target="_blank"><img src="https://img.shields.io/badge/-43%E3%83%BBExclude-7aad0c" alt="43・Exclude"/></a> <a href="./questions/189-easy-awaited/README.md" target="_blank"><img src="https://img.shields.io/badge/-189%E3%83%BBAwaited-7aad0c" alt="189・Awaited"/></a> <a href="./questions/268-easy-if/README.md" target="_blank"><img src="https://img.shields.io/badge/-268%E3%83%BBIf-7aad0c" alt="268・If"/></a> <a href="./questions/533-easy-concat/README.md" target="_blank"><img src="https://img.shields.io/badge/-533%E3%83%BBConcat-7aad0c" alt="533・Concat"/></a> <a href="./questions/898-easy-includes/README.md" target="_blank"><img src="https://img.shields.io/badge/-898%E3%83%BBIncludes-7aad0c" alt="898・Includes"/></a> <a href="./questions/3057-easy-push/README.md" target="_blank"><img src="https://img.shields.io/badge/-3057%E3%83%BBPush-7aad0c" alt="3057・Push"/></a> <a href="./questions/3060-easy-unshift/README.md" target="_blank"><img src="https://img.shields.io/badge/-3060%E3%83%BBUnshift-7aad0c" alt="3060・Unshift"/></a> <a href="./questions/3312-easy-parameters/README.md" target="_blank"><img src="https://img.shields.io/badge/-3312%E3%83%BBParameters-7aad0c" alt="3312・Parameters"/></a> <img src="https://img.shields.io/badge/medium-64-d9901a" alt="64"/> <a href="./questions/2-medium-return-type/README.md" target="_blank"><img src="https://img.shields.io/badge/-2%E3%83%BBGet%20Return%20Type-d9901a" alt="2・Get Return Type"/></a> <a href="./questions/3-medium-omit/README.md" target="_blank"><img src="https://img.shields.io/badge/-3%E3%83%BBOmit-d9901a" alt="3・Omit"/></a> <a href="./questions/8-medium-readonly-2/README.md" target="_blank"><img src="https://img.shields.io/badge/-8%E3%83%BBReadonly%202-d9901a" alt="8・Readonly 2"/></a> <a href="./questions/9-medium-deep-readonly/README.md" target="_blank"><img src="https://img.shields.io/badge/-9%E3%83%BBDeep%20Readonly-d9901a" alt="9・Deep Readonly"/></a> <a href="./questions/10-medium-tuple-to-union/README.md" target="_blank"><img src="https://img.shields.io/badge/-10%E3%83%BBTuple%20to%20Union-d9901a" alt="10・Tuple to Union"/></a> <a href="./questions/12-medium-chainable-options/README.md" target="_blank"><img src="https://img.shields.io/badge/-12%E3%83%BBChainable%20Options-d9901a" alt="12・Chainable Options"/></a> <a href="./questions/15-medium-last/README.md" target="_blank"><img src="https://img.shields.io/badge/-15%E3%83%BBLast%20of%20Array-d9901a" alt="15・Last of Array"/></a> <a href="./questions/16-medium-pop/README.md" target="_blank"><img src="https://img.shields.io/badge/-16%E3%83%BBPop-d9901a" alt="16・Pop"/></a> <a href="./questions/20-medium-promise-all/README.md" target="_blank"><img src="https://img.shields.io/badge/-20%E3%83%BBPromise.all-d9901a" alt="20・Promise.all"/></a> <a href="./questions/62-medium-type-lookup/README.md" target="_blank"><img src="https://img.shields.io/badge/-62%E3%83%BBType%20Lookup-d9901a" alt="62・Type Lookup"/></a> <a href="./questions/106-medium-trimleft/README.md" target="_blank"><img src="https://img.shields.io/badge/-106%E3%83%BBTrim%20Left-d9901a" alt="106・Trim Left"/></a> <a href="./questions/108-medium-trim/README.md" target="_blank"><img src="https://img.shields.io/badge/-108%E3%83%BBTrim-d9901a" alt="108・Trim"/></a> <a href="./questions/110-medium-capitalize/README.md" target="_blank"><img src="https://img.shields.io/badge/-110%E3%83%BBCapitalize-d9901a" alt="110・Capitalize"/></a> <a href="./questions/116-medium-replace/README.md" target="_blank"><img src="https://img.shields.io/badge/-116%E3%83%BBReplace-d9901a" alt="116・Replace"/></a> <a href="./questions/119-medium-replaceall/README.md" target="_blank"><img src="https://img.shields.io/badge/-119%E3%83%BBReplaceAll-d9901a" alt="119・ReplaceAll"/></a> <a href="./questions/191-medium-append-argument/README.md" target="_blank"><img src="https://img.shields.io/badge/-191%E3%83%BBAppend%20Argument-d9901a" alt="191・Append Argument"/></a> <a href="./questions/296-medium-permutation/README.md" target="_blank"><img src="https://img.shields.io/badge/-296%E3%83%BBPermutation-d9901a" alt="296・Permutation"/></a> <a href="./questions/298-medium-length-of-string/README.md" target="_blank"><img src="https://img.shields.io/badge/-298%E3%83%BBLength%20of%20String-d9901a" alt="298・Length of String"/></a> <a href="./questions/459-medium-flatten/README.md" target="_blank"><img src="https://img.shields.io/badge/-459%E3%83%BBFlatten-d9901a" alt="459・Flatten"/></a> <a href="./questions/527-medium-append-to-object/README.md" target="_blank"><img src="https://img.shields.io/badge/-527%E3%83%BBAppend%20to%20object-d9901a" alt="527・Append to object"/></a> <a href="./questions/529-medium-absolute/README.md" target="_blank"><img src="https://img.shields.io/badge/-529%E3%83%BBAbsolute-d9901a" alt="529・Absolute"/></a> <a href="./questions/531-medium-string-to-union/README.md" target="_blank"><img src="https://img.shields.io/badge/-531%E3%83%BBString%20to%20Union-d9901a" alt="531・String to Union"/></a> <a href="./questions/599-medium-merge/README.md" target="_blank"><img src="https://img.shields.io/badge/-599%E3%83%BBMerge-d9901a" alt="599・Merge"/></a> <a href="./questions/610-medium-camelcase/README.md" target="_blank"><img src="https://img.shields.io/badge/-610%E3%83%BBCamelCase-d9901a" alt="610・CamelCase"/></a> <a href="./questions/612-medium-kebabcase/README.md" target="_blank"><img src="https://img.shields.io/badge/-612%E3%83%BBKebabCase-d9901a" alt="612・KebabCase"/></a> <a href="./questions/645-medium-diff/README.md" target="_blank"><img src="https://img.shields.io/badge/-645%E3%83%BBDiff-d9901a" alt="645・Diff"/></a> <a href="./questions/949-medium-anyof/README.md" target="_blank"><img src="https://img.shields.io/badge/-949%E3%83%BBAnyOf-d9901a" alt="949・AnyOf"/></a> <a href="./questions/1042-medium-isnever/README.md" target="_blank"><img src="https://img.shields.io/badge/-1042%E3%83%BBIsNever-d9901a" alt="1042・IsNever"/></a> <a href="./questions/1097-medium-isunion/README.md" target="_blank"><img src="https://img.shields.io/badge/-1097%E3%83%BBIsUnion-d9901a" alt="1097・IsUnion"/></a> <a href="./questions/1130-medium-replacekeys/README.md" target="_blank"><img src="https://img.shields.io/badge/-1130%E3%83%BBReplaceKeys-d9901a" alt="1130・ReplaceKeys"/></a> <a href="./questions/1367-medium-remove-index-signature/README.md" target="_blank"><img src="https://img.shields.io/badge/-1367%E3%83%BBRemove%20Index%20Signature-d9901a" alt="1367・Remove Index Signature"/></a> <a href="./questions/1978-medium-percentage-parser/README.md" target="_blank"><img src="https://img.shields.io/badge/-1978%E3%83%BBPercentage%20Parser-d9901a" alt="1978・Percentage Parser"/></a> <a href="./questions/2070-medium-drop-char/README.md" target="_blank"><img src="https://img.shields.io/badge/-2070%E3%83%BBDrop%20Char-d9901a" alt="2070・Drop Char"/></a> <a href="./questions/2257-medium-minusone/README.md" target="_blank"><img src="https://img.shields.io/badge/-2257%E3%83%BBMinusOne-d9901a" alt="2257・MinusOne"/></a> <a href="./questions/2595-medium-pickbytype/README.md" target="_blank"><img src="https://img.shields.io/badge/-2595%E3%83%BBPickByType-d9901a" alt="2595・PickByType"/></a> <a href="./questions/2688-medium-startswith/README.md" target="_blank"><img src="https://img.shields.io/badge/-2688%E3%83%BBStartsWith-d9901a" alt="2688・StartsWith"/></a> <a href="./questions/2693-medium-endswith/README.md" target="_blank"><img src="https://img.shields.io/badge/-2693%E3%83%BBEndsWith-d9901a" alt="2693・EndsWith"/></a> <a href="./questions/2757-medium-partialbykeys/README.md" target="_blank"><img src="https://img.shields.io/badge/-2757%E3%83%BBPartialByKeys-d9901a" alt="2757・PartialByKeys"/></a> <a href="./questions/2759-medium-requiredbykeys/README.md" target="_blank"><img src="https://img.shields.io/badge/-2759%E3%83%BBRequiredByKeys-d9901a" alt="2759・RequiredByKeys"/></a> <a href="./questions/2793-medium-mutable/README.md" target="_blank"><img src="https://img.shields.io/badge/-2793%E3%83%BBMutable-d9901a" alt="2793・Mutable"/></a> <a href="./questions/2852-medium-omitbytype/README.md" target="_blank"><img src="https://img.shields.io/badge/-2852%E3%83%BBOmitByType-d9901a" alt="2852・OmitByType"/></a> <a href="./questions/2946-medium-objectentries/README.md" target="_blank"><img src="https://img.shields.io/badge/-2946%E3%83%BBObjectEntries-d9901a" alt="2946・ObjectEntries"/></a> <a href="./questions/3062-medium-shift/README.md" target="_blank"><img src="https://img.shields.io/badge/-3062%E3%83%BBShift-d9901a" alt="3062・Shift"/></a> <a href="./questions/3188-medium-tuple-to-nested-object/README.md" target="_blank"><img src="https://img.shields.io/badge/-3188%E3%83%BBTuple%20to%20Nested%20Object-d9901a" alt="3188・Tuple to Nested Object"/></a> <a href="./questions/3192-medium-reverse/README.md" target="_blank"><img src="https://img.shields.io/badge/-3192%E3%83%BBReverse-d9901a" alt="3192・Reverse"/></a> <a href="./questions/3196-medium-flip-arguments/README.md" target="_blank"><img src="https://img.shields.io/badge/-3196%E3%83%BBFlip%20Arguments-d9901a" alt="3196・Flip Arguments"/></a> <a href="./questions/3243-medium-flattendepth/README.md" target="_blank"><img src="https://img.shields.io/badge/-3243%E3%83%BBFlattenDepth-d9901a" alt="3243・FlattenDepth"/></a> <a href="./questions/3326-medium-bem-style-string/README.md" target="_blank"><img src="https://img.shields.io/badge/-3326%E3%83%BBBEM%20style%20string-d9901a" alt="3326・BEM style string"/></a> <a href="./questions/3376-medium-inordertraversal/README.md" target="_blank"><img src="https://img.shields.io/badge/-3376%E3%83%BBInorderTraversal-d9901a" alt="3376・InorderTraversal"/></a> <a href="./questions/4179-medium-flip/README.md" target="_blank"><img src="https://img.shields.io/badge/-4179%E3%83%BBFlip-d9901a" alt="4179・Flip"/></a> <a href="./questions/4182-medium-fibonacci-sequence/README.md" target="_blank"><img src="https://img.shields.io/badge/-4182%E3%83%BBFibonacci%20Sequence-d9901a" alt="4182・Fibonacci Sequence"/></a> <a href="./questions/4260-medium-nomiwase/README.md" target="_blank"><img src="https://img.shields.io/badge/-4260%E3%83%BBAllCombinations-d9901a" alt="4260・AllCombinations"/></a> <a href="./questions/4425-medium-greater-than/README.md" target="_blank"><img src="https://img.shields.io/badge/-4425%E3%83%BBGreater%20Than-d9901a" alt="4425・Greater Than"/></a> <a href="./questions/4471-medium-zip/README.md" target="_blank"><img src="https://img.shields.io/badge/-4471%E3%83%BBZip-d9901a" alt="4471・Zip"/></a> <a href="./questions/4484-medium-istuple/README.md" target="_blank"><img src="https://img.shields.io/badge/-4484%E3%83%BBIsTuple-d9901a" alt="4484・IsTuple"/></a> <a href="./questions/4499-medium-chunk/README.md" target="_blank"><img src="https://img.shields.io/badge/-4499%E3%83%BBChunk-d9901a" alt="4499・Chunk"/></a> <a href="./questions/4518-medium-fill/README.md" target="_blank"><img src="https://img.shields.io/badge/-4518%E3%83%BBFill-d9901a" alt="4518・Fill"/></a> <a href="./questions/4803-medium-trim-right/README.md" target="_blank"><img src="https://img.shields.io/badge/-4803%E3%83%BBTrim%20Right-d9901a" alt="4803・Trim Right"/></a> <a href="./questions/5117-medium-without/README.md" target="_blank"><img src="https://img.shields.io/badge/-5117%E3%83%BBWithout-d9901a" alt="5117・Without"/></a> <a href="./questions/5140-medium-trunc/README.md" target="_blank"><img src="https://img.shields.io/badge/-5140%E3%83%BBTrunc-d9901a" alt="5140・Trunc"/></a> <a href="./questions/5153-medium-indexof/README.md" target="_blank"><img src="https://img.shields.io/badge/-5153%E3%83%BBIndexOf-d9901a" alt="5153・IndexOf"/></a> <a href="./questions/5310-medium-join/README.md" target="_blank"><img src="https://img.shields.io/badge/-5310%E3%83%BBJoin-d9901a" alt="5310・Join"/></a> <a href="./questions/5317-medium-lastindexof/README.md" target="_blank"><img src="https://img.shields.io/badge/-5317%E3%83%BBLastIndexOf-d9901a" alt="5317・LastIndexOf"/></a> <a href="./questions/5360-medium-unique/README.md" target="_blank"><img src="https://img.shields.io/badge/-5360%E3%83%BBUnique-d9901a" alt="5360・Unique"/></a> <img src="https://img.shields.io/badge/hard-32-de3d37" alt="32"/> <a href="./questions/6-hard-simple-vue/README.md" target="_blank"><img src="https://img.shields.io/badge/-6%E3%83%BBSimple%20Vue-de3d37" alt="6・Simple Vue"/></a> <a href="./questions/17-hard-currying-1/README.md" target="_blank"><img src="https://img.shields.io/badge/-17%E3%83%BBCurrying%201-de3d37" alt="17・Currying 1"/></a> <a href="./questions/55-hard-union-to-intersection/README.md" target="_blank"><img src="https://img.shields.io/badge/-55%E3%83%BBUnion%20to%20Intersection-de3d37" alt="55・Union to Intersection"/></a> <a href="./questions/57-hard-get-required/README.md" target="_blank"><img src="https://img.shields.io/badge/-57%E3%83%BBGet%20Required-de3d37" alt="57・Get Required"/></a> <a href="./questions/59-hard-get-optional/README.md" target="_blank"><img src="https://img.shields.io/badge/-59%E3%83%BBGet%20Optional-de3d37" alt="59・Get Optional"/></a> <a href="./questions/89-hard-required-keys/README.md" target="_blank"><img src="https://img.shields.io/badge/-89%E3%83%BBRequired%20Keys-de3d37" alt="89・Required Keys"/></a> <a href="./questions/90-hard-optional-keys/README.md" target="_blank"><img src="https://img.shields.io/badge/-90%E3%83%BBOptional%20Keys-de3d37" alt="90・Optional Keys"/></a> <a href="./questions/112-hard-capitalizewords/README.md" target="_blank"><img src="https://img.shields.io/badge/-112%E3%83%BBCapitalize%20Words-de3d37" alt="112・Capitalize Words"/></a> <a href="./questions/114-hard-camelcase/README.md" target="_blank"><img src="https://img.shields.io/badge/-114%E3%83%BBCamelCase-de3d37" alt="114・CamelCase"/></a> <a href="./questions/147-hard-c-printf-parser/README.md" target="_blank"><img src="https://img.shields.io/badge/-147%E3%83%BBC--printf%20Parser-de3d37" alt="147・C-printf Parser"/></a> <a href="./questions/213-hard-vue-basic-props/README.md" target="_blank"><img src="https://img.shields.io/badge/-213%E3%83%BBVue%20Basic%20Props-de3d37" alt="213・Vue Basic Props"/></a> <a href="./questions/223-hard-isany/README.md" target="_blank"><img src="https://img.shields.io/badge/-223%E3%83%BBIsAny-de3d37" alt="223・IsAny"/></a> <a href="./questions/270-hard-typed-get/README.md" target="_blank"><img src="https://img.shields.io/badge/-270%E3%83%BBTyped%20Get-de3d37" alt="270・Typed Get"/></a> <a href="./questions/300-hard-string-to-number/README.md" target="_blank"><img src="https://img.shields.io/badge/-300%E3%83%BBString%20to%20Number-de3d37" alt="300・String to Number"/></a> <a href="./questions/399-hard-tuple-filter/README.md" target="_blank"><img src="https://img.shields.io/badge/-399%E3%83%BBTuple%20Filter-de3d37" alt="399・Tuple Filter"/></a> <a href="./questions/472-hard-tuple-to-enum-object/README.md" target="_blank"><img src="https://img.shields.io/badge/-472%E3%83%BBTuple%20to%20Enum%20Object-de3d37" alt="472・Tuple to Enum Object"/></a> <a href="./questions/545-hard-printf/README.md" target="_blank"><img src="https://img.shields.io/badge/-545%E3%83%BBprintf-de3d37" alt="545・printf"/></a> <a href="./questions/553-hard-deep-object-to-unique/README.md" target="_blank"><img src="https://img.shields.io/badge/-553%E3%83%BBDeep%20object%20to%20unique-de3d37" alt="553・Deep object to unique"/></a> <a href="./questions/651-hard-length-of-string-2/README.md" target="_blank"><img src="https://img.shields.io/badge/-651%E3%83%BBLength%20of%20String%202-de3d37" alt="651・Length of String 2"/></a> <a href="./questions/730-hard-union-to-tuple/README.md" target="_blank"><img src="https://img.shields.io/badge/-730%E3%83%BBUnion%20to%20Tuple-de3d37" alt="730・Union to Tuple"/></a> <a href="./questions/847-hard-string-join/README.md" target="_blank"><img src="https://img.shields.io/badge/-847%E3%83%BBString%20Join-de3d37" alt="847・String Join"/></a> <a href="./questions/956-hard-deeppick/README.md" target="_blank"><img src="https://img.shields.io/badge/-956%E3%83%BBDeepPick-de3d37" alt="956・DeepPick"/></a> <a href="./questions/1290-hard-pinia/README.md" target="_blank"><img src="https://img.shields.io/badge/-1290%E3%83%BBPinia-de3d37" alt="1290・Pinia"/></a> <a href="./questions/1383-hard-camelize/README.md" target="_blank"><img src="https://img.shields.io/badge/-1383%E3%83%BBCamelize-de3d37" alt="1383・Camelize"/></a> <a href="./questions/2059-hard-drop-string/README.md" target="_blank"><img src="https://img.shields.io/badge/-2059%E3%83%BBDrop%20String-de3d37" alt="2059・Drop String"/></a> <a href="./questions/2822-hard-split/README.md" target="_blank"><img src="https://img.shields.io/badge/-2822%E3%83%BBSplit-de3d37" alt="2822・Split"/></a> <a href="./questions/2828-hard-classpublickeys/README.md" target="_blank"><img src="https://img.shields.io/badge/-2828%E3%83%BBClassPublicKeys-de3d37" alt="2828・ClassPublicKeys"/></a> <a href="./questions/2857-hard-isrequiredkey/README.md" target="_blank"><img src="https://img.shields.io/badge/-2857%E3%83%BBIsRequiredKey-de3d37" alt="2857・IsRequiredKey"/></a> <a href="./questions/2949-hard-objectfromentries/README.md" target="_blank"><img src="https://img.shields.io/badge/-2949%E3%83%BBObjectFromEntries-de3d37" alt="2949・ObjectFromEntries"/></a> <a href="./questions/4037-hard-ispalindrome/README.md" target="_blank"><img src="https://img.shields.io/badge/-4037%E3%83%BBIsPalindrome-de3d37" alt="4037・IsPalindrome"/></a> 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target="_blank"><img src="https://img.shields.io/badge/-1383%E3%83%BBCamelize-de3d37" alt="1383・Camelize"/></a> </td></tr><tr><td><img src="https://img.shields.io/badge/-%23split-999" alt="#split"/></td><td><a href="./questions/2822-hard-split/README.md" target="_blank"><img src="https://img.shields.io/badge/-2822%E3%83%BBSplit-de3d37" alt="2822・Split"/></a> </td></tr><tr><td><img src="https://img.shields.io/badge/-%23string-999" alt="#string"/></td><td><a href="./questions/531-medium-string-to-union/README.md" target="_blank"><img src="https://img.shields.io/badge/-531%E3%83%BBString%20to%20Union-d9901a" alt="531・String to Union"/></a> <a href="./questions/2822-hard-split/README.md" target="_blank"><img src="https://img.shields.io/badge/-2822%E3%83%BBSplit-de3d37" alt="2822・Split"/></a> <a href="./questions/4037-hard-ispalindrome/README.md" target="_blank"><img src="https://img.shields.io/badge/-4037%E3%83%BBIsPalindrome-de3d37" alt="4037・IsPalindrome"/></a> </td></tr><tr><td><img src="https://img.shields.io/badge/-%23template--literal-999" alt="#template-literal"/></td><td><a href="./questions/106-medium-trimleft/README.md" target="_blank"><img src="https://img.shields.io/badge/-106%E3%83%BBTrim%20Left-d9901a" alt="106・Trim Left"/></a> <a href="./questions/108-medium-trim/README.md" target="_blank"><img src="https://img.shields.io/badge/-108%E3%83%BBTrim-d9901a" alt="108・Trim"/></a> <a href="./questions/110-medium-capitalize/README.md" target="_blank"><img src="https://img.shields.io/badge/-110%E3%83%BBCapitalize-d9901a" alt="110・Capitalize"/></a> <a href="./questions/116-medium-replace/README.md" target="_blank"><img src="https://img.shields.io/badge/-116%E3%83%BBReplace-d9901a" alt="116・Replace"/></a> <a href="./questions/119-medium-replaceall/README.md" target="_blank"><img src="https://img.shields.io/badge/-119%E3%83%BBReplaceAll-d9901a" alt="119・ReplaceAll"/></a> <a href="./questions/298-medium-length-of-string/README.md" target="_blank"><img src="https://img.shields.io/badge/-298%E3%83%BBLength%20of%20String-d9901a" alt="298・Length of String"/></a> <a href="./questions/529-medium-absolute/README.md" target="_blank"><img src="https://img.shields.io/badge/-529%E3%83%BBAbsolute-d9901a" alt="529・Absolute"/></a> <a href="./questions/610-medium-camelcase/README.md" target="_blank"><img src="https://img.shields.io/badge/-610%E3%83%BBCamelCase-d9901a" alt="610・CamelCase"/></a> <a href="./questions/612-medium-kebabcase/README.md" target="_blank"><img src="https://img.shields.io/badge/-612%E3%83%BBKebabCase-d9901a" alt="612・KebabCase"/></a> <a href="./questions/2070-medium-drop-char/README.md" target="_blank"><img src="https://img.shields.io/badge/-2070%E3%83%BBDrop%20Char-d9901a" alt="2070・Drop Char"/></a> <a href="./questions/2688-medium-startswith/README.md" target="_blank"><img src="https://img.shields.io/badge/-2688%E3%83%BBStartsWith-d9901a" alt="2688・StartsWith"/></a> <a href="./questions/2693-medium-endswith/README.md" target="_blank"><img src="https://img.shields.io/badge/-2693%E3%83%BBEndsWith-d9901a" alt="2693・EndsWith"/></a> <a href="./questions/3326-medium-bem-style-string/README.md" target="_blank"><img src="https://img.shields.io/badge/-3326%E3%83%BBBEM%20style%20string-d9901a" alt="3326・BEM style string"/></a> <a href="./questions/5140-medium-trunc/README.md" target="_blank"><img src="https://img.shields.io/badge/-5140%E3%83%BBTrunc-d9901a" alt="5140・Trunc"/></a> <a href="./questions/112-hard-capitalizewords/README.md" target="_blank"><img src="https://img.shields.io/badge/-112%E3%83%BBCapitalize%20Words-de3d37" alt="112・Capitalize Words"/></a> <a href="./questions/114-hard-camelcase/README.md" target="_blank"><img src="https://img.shields.io/badge/-114%E3%83%BBCamelCase-de3d37" alt="114・CamelCase"/></a> <a href="./questions/147-hard-c-printf-parser/README.md" target="_blank"><img src="https://img.shields.io/badge/-147%E3%83%BBC--printf%20Parser-de3d37" alt="147・C-printf Parser"/></a> <a href="./questions/270-hard-typed-get/README.md" target="_blank"><img src="https://img.shields.io/badge/-270%E3%83%BBTyped%20Get-de3d37" alt="270・Typed Get"/></a> <a href="./questions/300-hard-string-to-number/README.md" target="_blank"><img src="https://img.shields.io/badge/-300%E3%83%BBString%20to%20Number-de3d37" alt="300・String to Number"/></a> <a href="./questions/472-hard-tuple-to-enum-object/README.md" target="_blank"><img src="https://img.shields.io/badge/-472%E3%83%BBTuple%20to%20Enum%20Object-de3d37" alt="472・Tuple to Enum Object"/></a> <a href="./questions/545-hard-printf/README.md" target="_blank"><img src="https://img.shields.io/badge/-545%E3%83%BBprintf-de3d37" alt="545・printf"/></a> <a href="./questions/651-hard-length-of-string-2/README.md" target="_blank"><img src="https://img.shields.io/badge/-651%E3%83%BBLength%20of%20String%202-de3d37" alt="651・Length of String 2"/></a> <a href="./questions/2059-hard-drop-string/README.md" target="_blank"><img src="https://img.shields.io/badge/-2059%E3%83%BBDrop%20String-de3d37" alt="2059・Drop String"/></a> <a href="./questions/151-extreme-query-string-parser/README.md" target="_blank"><img src="https://img.shields.io/badge/-151%E3%83%BBQuery%20String%20Parser-b11b8d" alt="151・Query String Parser"/></a> <a href="./questions/274-extreme-integers-comparator/README.md" target="_blank"><img src="https://img.shields.io/badge/-274%E3%83%BBIntegers%20Comparator-b11b8d" alt="274・Integers Comparator"/></a> <a href="./questions/476-extreme-sum/README.md" target="_blank"><img src="https://img.shields.io/badge/-476%E3%83%BBSum-b11b8d" alt="476・Sum"/></a> <a href="./questions/517-extreme-multiply/README.md" target="_blank"><img src="https://img.shields.io/badge/-517%E3%83%BBMultiply-b11b8d" alt="517・Multiply"/></a> </td></tr><tr><td><img src="https://img.shields.io/badge/-%23this-999" alt="#this"/></td><td><a href="./questions/6-hard-simple-vue/README.md" target="_blank"><img src="https://img.shields.io/badge/-6%E3%83%BBSimple%20Vue-de3d37" alt="6・Simple Vue"/></a> <a href="./questions/1290-hard-pinia/README.md" target="_blank"><img src="https://img.shields.io/badge/-1290%E3%83%BBPinia-de3d37" alt="1290・Pinia"/></a> </td></tr><tr><td><img src="https://img.shields.io/badge/-%23tuple-999" alt="#tuple"/></td><td><a href="./questions/18-easy-tuple-length/README.md" target="_blank"><img src="https://img.shields.io/badge/-18%E3%83%BBLength%20of%20Tuple-7aad0c" alt="18・Length of Tuple"/></a> <a href="./questions/3312-easy-parameters/README.md" target="_blank"><img src="https://img.shields.io/badge/-3312%E3%83%BBParameters-7aad0c" alt="3312・Parameters"/></a> <a href="./questions/10-medium-tuple-to-union/README.md" target="_blank"><img src="https://img.shields.io/badge/-10%E3%83%BBTuple%20to%20Union-d9901a" alt="10・Tuple to Union"/></a> <a href="./questions/3192-medium-reverse/README.md" target="_blank"><img src="https://img.shields.io/badge/-3192%E3%83%BBReverse-d9901a" alt="3192・Reverse"/></a> <a href="./questions/3326-medium-bem-style-string/README.md" target="_blank"><img src="https://img.shields.io/badge/-3326%E3%83%BBBEM%20style%20string-d9901a" alt="3326・BEM style string"/></a> <a href="./questions/4471-medium-zip/README.md" target="_blank"><img src="https://img.shields.io/badge/-4471%E3%83%BBZip-d9901a" alt="4471・Zip"/></a> <a href="./questions/4484-medium-istuple/README.md" target="_blank"><img src="https://img.shields.io/badge/-4484%E3%83%BBIsTuple-d9901a" alt="4484・IsTuple"/></a> <a href="./questions/4499-medium-chunk/README.md" target="_blank"><img src="https://img.shields.io/badge/-4499%E3%83%BBChunk-d9901a" alt="4499・Chunk"/></a> <a href="./questions/4518-medium-fill/README.md" target="_blank"><img src="https://img.shields.io/badge/-4518%E3%83%BBFill-d9901a" alt="4518・Fill"/></a> <a href="./questions/399-hard-tuple-filter/README.md" target="_blank"><img src="https://img.shields.io/badge/-399%E3%83%BBTuple%20Filter-de3d37" alt="399・Tuple Filter"/></a> <a href="./questions/472-hard-tuple-to-enum-object/README.md" target="_blank"><img src="https://img.shields.io/badge/-472%E3%83%BBTuple%20to%20Enum%20Object-de3d37" alt="472・Tuple to Enum Object"/></a> <a href="./questions/730-hard-union-to-tuple/README.md" target="_blank"><img src="https://img.shields.io/badge/-730%E3%83%BBUnion%20to%20Tuple-de3d37" alt="730・Union to Tuple"/></a> <a href="./questions/2822-hard-split/README.md" target="_blank"><img src="https://img.shields.io/badge/-2822%E3%83%BBSplit-de3d37" alt="2822・Split"/></a> </td></tr><tr><td><img src="https://img.shields.io/badge/-%23union-999" alt="#union"/></td><td><a href="./questions/4-easy-pick/README.md" target="_blank"><img src="https://img.shields.io/badge/-4%E3%83%BBPick-7aad0c" alt="4・Pick"/></a> <a href="./questions/3-medium-omit/README.md" target="_blank"><img src="https://img.shields.io/badge/-3%E3%83%BBOmit-d9901a" alt="3・Omit"/></a> <a href="./questions/10-medium-tuple-to-union/README.md" target="_blank"><img src="https://img.shields.io/badge/-10%E3%83%BBTuple%20to%20Union-d9901a" alt="10・Tuple to Union"/></a> <a href="./questions/62-medium-type-lookup/README.md" target="_blank"><img src="https://img.shields.io/badge/-62%E3%83%BBType%20Lookup-d9901a" alt="62・Type Lookup"/></a> <a href="./questions/296-medium-permutation/README.md" target="_blank"><img src="https://img.shields.io/badge/-296%E3%83%BBPermutation-d9901a" alt="296・Permutation"/></a> <a href="./questions/531-medium-string-to-union/README.md" target="_blank"><img src="https://img.shields.io/badge/-531%E3%83%BBString%20to%20Union-d9901a" alt="531・String to Union"/></a> <a href="./questions/1042-medium-isnever/README.md" target="_blank"><img src="https://img.shields.io/badge/-1042%E3%83%BBIsNever-d9901a" alt="1042・IsNever"/></a> <a href="./questions/3326-medium-bem-style-string/README.md" target="_blank"><img src="https://img.shields.io/badge/-3326%E3%83%BBBEM%20style%20string-d9901a" alt="3326・BEM style string"/></a> <a href="./questions/5117-medium-without/README.md" target="_blank"><img src="https://img.shields.io/badge/-5117%E3%83%BBWithout-d9901a" alt="5117・Without"/></a> <a href="./questions/730-hard-union-to-tuple/README.md" target="_blank"><img src="https://img.shields.io/badge/-730%E3%83%BBUnion%20to%20Tuple-de3d37" alt="730・Union to Tuple"/></a> <a href="./questions/1383-hard-camelize/README.md" target="_blank"><img src="https://img.shields.io/badge/-1383%E3%83%BBCamelize-de3d37" alt="1383・Camelize"/></a> <a href="./questions/5423-hard-intersection/README.md" target="_blank"><img src="https://img.shields.io/badge/-5423%E3%83%BBIntersection-de3d37" alt="5423・Intersection"/></a> </td></tr><tr><td><img src="https://img.shields.io/badge/-%23utils-999" alt="#utils"/></td><td><a href="./questions/268-easy-if/README.md" target="_blank"><img src="https://img.shields.io/badge/-268%E3%83%BBIf-7aad0c" alt="268・If"/></a> <a href="./questions/1042-medium-isnever/README.md" target="_blank"><img src="https://img.shields.io/badge/-1042%E3%83%BBIsNever-d9901a" alt="1042・IsNever"/></a> <a href="./questions/55-hard-union-to-intersection/README.md" target="_blank"><img src="https://img.shields.io/badge/-55%E3%83%BBUnion%20to%20Intersection-de3d37" alt="55・Union to Intersection"/></a> <a href="./questions/57-hard-get-required/README.md" target="_blank"><img src="https://img.shields.io/badge/-57%E3%83%BBGet%20Required-de3d37" alt="57・Get Required"/></a> <a href="./questions/59-hard-get-optional/README.md" target="_blank"><img src="https://img.shields.io/badge/-59%E3%83%BBGet%20Optional-de3d37" alt="59・Get Optional"/></a> <a href="./questions/89-hard-required-keys/README.md" target="_blank"><img src="https://img.shields.io/badge/-89%E3%83%BBRequired%20Keys-de3d37" alt="89・Required Keys"/></a> <a href="./questions/90-hard-optional-keys/README.md" target="_blank"><img src="https://img.shields.io/badge/-90%E3%83%BBOptional%20Keys-de3d37" alt="90・Optional Keys"/></a> <a href="./questions/223-hard-isany/README.md" target="_blank"><img src="https://img.shields.io/badge/-223%E3%83%BBIsAny-de3d37" alt="223・IsAny"/></a> <a href="./questions/270-hard-typed-get/README.md" target="_blank"><img src="https://img.shields.io/badge/-270%E3%83%BBTyped%20Get-de3d37" alt="270・Typed Get"/></a> <a href="./questions/2828-hard-classpublickeys/README.md" target="_blank"><img src="https://img.shields.io/badge/-2828%E3%83%BBClassPublicKeys-de3d37" alt="2828・ClassPublicKeys"/></a> <a href="./questions/2857-hard-isrequiredkey/README.md" target="_blank"><img src="https://img.shields.io/badge/-2857%E3%83%BBIsRequiredKey-de3d37" alt="2857・IsRequiredKey"/></a> <a href="./questions/5181-hard-mutable-keys/README.md" target="_blank"><img src="https://img.shields.io/badge/-5181%E3%83%BBMutable%20Keys-de3d37" alt="5181・Mutable Keys"/></a> <a href="./questions/5-extreme-readonly-keys/README.md" target="_blank"><img src="https://img.shields.io/badge/-5%E3%83%BBGet%20Readonly%20Keys-b11b8d" alt="5・Get Readonly Keys"/></a> </td></tr><tr><td><img src="https://img.shields.io/badge/-%23vue-999" alt="#vue"/></td><td><a href="./questions/6-hard-simple-vue/README.md" target="_blank"><img src="https://img.shields.io/badge/-6%E3%83%BBSimple%20Vue-de3d37" alt="6・Simple Vue"/></a> <a href="./questions/213-hard-vue-basic-props/README.md" target="_blank"><img src="https://img.shields.io/badge/-213%E3%83%BBVue%20Basic%20Props-de3d37" alt="213・Vue Basic Props"/></a> <a href="./questions/1290-hard-pinia/README.md" target="_blank"><img src="https://img.shields.io/badge/-1290%E3%83%BBPinia-de3d37" alt="1290・Pinia"/></a> </td></tr><tr><td><code>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</code></td><td></td></tr></tbody></table></details>

> ✨ [Upcoming challenges](https://github.com/type-challenges/type-challenges/issues?q=is%3Aissue+is%3Aopen+label%3Anew-challenge)

> 🔥 Start the challenge in [TypeScript Playground](https://www.typescriptlang.org/play?install-plugin=%40type-challenges%2Fplayground-plugin)

## Recommended Readings

### Official

- [The TypeScript Handbook](https://www.typescriptlang.org/docs/handbook/intro.html)

- [Unions and Intersection Types](https://www.typescriptlang.org/docs/handbook/2/everyday-types.html#union-types)
  - [Literal Types](https://www.typescriptlang.org/docs/handbook/2/everyday-types.html#literal-types)
  - [Utility Types](https://www.typescriptlang.org/docs/handbook/utility-types.html)
  - [Advanced Types](https://www.typescriptlang.org/docs/handbook/2/types-from-types.html)

- [The New Handbook](https://github.com/microsoft/TypeScript-Website/tree/v2/packages/documentation/copy/en/handbook-v2)

### Articles

- [Learn Advanced TypeScript Types](https://medium.com/free-code-camp/typescript-curry-ramda-types-f747e99744ab)
- [The Art of Type Programming](https://mistlog.medium.com/the-art-of-type-programming-cfd933bdfff7)
- [Type Query: jQuery Style Type Manipulation](https://mistlog.medium.com/type-query-jquery-style-type-manipulation-497ce26d93f)

### Talks

- [Type Level Programming in Typescript](https://www.youtube.com/watch?reload=9&v=vGVvJuazs84)

### Projects / Solutions

- [Type Gymnastics](https://github.com/g-plane/type-gymnastics)
- [Type Challenges Solutions](https://github.com/ghaiklor/type-challenges-solutions)
- [TypeType Examples](https://github.com/mistlog/typetype-examples)

> TODO

## How to Contribute

There are several ways you can contribute to this project

- Share your answers / solutions
- Propose new challenges
- Add more test cases to the existing challenges
- Provide learning resources or ideas of how to solve challenges
- Share the problems you have faced in real-world projects, regardless you having the solution or not - the community would help you as well
- Help with others by discussion in issues
- Contribute the infra of this project [TODOs.md](./TODOs.md)

Just [open an issue](https://github.com/type-challenges/type-challenges/issues/new/choose) and choose the corresponding template. Thanks!

## Thanks

This project was born from solving real-world types problem with [@hardfist](https://github.com/hardfist) and [@MeCKodo](https://github.com/MeCKodo). And great thanks to [@sinoon](https://github.com/sinoon) who contributed a lot while giving early feedback on this project.

### Inspired by

- [piotrwitek/utility-types](https://github.com/piotrwitek/utility-types)
- [psmyrdek/typescript-challenges](https://github.com/psmyrdek/typescript-challenges)
- [andnp/SimplyTyped](https://github.com/andnp/SimplyTyped)

### [Contributors](https://github.com/type-challenges/type-challenges/graphs/contributors)

## License

MIT

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