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TypeScript(JavaScript)でArrayの分割をする

Last updated at Posted at 2019-07-02
const array = ['www.apple.com', 'www.apple.com', 'www.apple.com', 'www.apple.com', 'www.apple.com'];

みたいなarrayを規定の上限数で分割したい時ってありますよね。

chunking = <T>(array: T[], size: number): T[][] => {
  return (array.length <= size) ?
    [array] :
    [array.slice(0, size), ...chunking(array.slice(size), size)];
}

スクリーンショット 2019-07-02 17.33.14.png

パフォーマンスが重要ならsliceを使ったやり方の方が良い。

via https://scotch.io/courses/the-ultimate-guide-to-javascript-algorithms/array-chunking

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