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

Symbol.split - JavaScript | MDN

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El símbolo conocido como Symbol.split especifica el método que divide una cadena en los índices que coinciden con una expresión regular. Esta función es llamada por el método String.prototype.split().

Para más información, véase RegExp.prototype[@@split]() y String.prototype.split().

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()));
// resultado esperado: [ "dust", "the", "bites", "one", "Another" ]

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