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Showing content from https://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Global_Objects/Symbol/split below:

Symbol.split - JavaScript | MDN

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Symbol.split ウェルノウンシンボルは、正規表現に一致する位置で文字列を分割するメソッドを指定します。この関数は String.prototype.split() メソッドによって呼び出されます。

詳しくは、 RegExp.prototype[Symbol.split]() と String.prototype.split() を参照してください。

class Split1 {
  constructor(value) {
    this.value = value;
  }
  [Symbol.split](string) {
    const index = string.indexOf(this.value);
    return `${this.value}${string.substring(0, index)}/${string.substring(
      index + this.value.length,
    )}`;
  }
}

console.log("foobar".split(new Split1("foo")));
// Expected output: "foo/bar"

class ReverseSplit {
  [Symbol.split](string) {
    const array = string.split(" ");
    return array.reverse();
  }
}

console.log("Another one bites the dust".split(new ReverseSplit()));
// expected output: [ "dust", "the", "bites", "one", "Another" ]

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