master

分支 (1)

管理

管理

master

programming-questions
/
Array.filter.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      Array.prototype._filter = function (fn) {
        if (typeof fn !== 'function') return
        let result = []
        for (let i = 0; i < this.length; i++) {
          if (fn(this[i])) result.push(this[i])
        }
        return result
      }
      console.log([1, 2]._filter((i) => i > 1))
    </script>
  </body>
</html>