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

Symbol.replace - JavaScript | MDN

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El símbolo conocido como Symbol.replace especifica el método que reemplaza las subcadenas coincidentes de una cadena. Esta función es llamada por el método String.prototype.replace().

Para más información, consulte RegExp.prototype[@@replace]() y String.prototype.replace().

class Replace1 {
  constructor(value) {
    this.value = value;
  }
  [Symbol.replace](string) {
    return `s/${string}/${this.value}/g`;
  }
}

console.log("foo".replace(new Replace1("bar")));
// Expected output: "s/foo/bar/g"

class CustomReplacer {
  constructor(value) {
    this.value = value;
  }
  [Symbol.replace](string) {
    return string.replace(this.value, "#!@?");
  }
}

console.log("football".replace(new CustomReplacer("foo")));
// salida esperada: "#!@?tball"

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