Symbol.split

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2015.

The Symbol.split static data property represents the well-known symbol Symbol.split. The String.prototype.split() method looks up this symbol on its first argument for the method that splits a string at the indices that match the current object.

For more information, see RegExp.prototype[Symbol.split]() and String.prototype.split().

Try it

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"

Value

The well-known symbol Symbol.split.

Property attributes of `Symbol.split`
Writable	no
Enumerable	no
Configurable	no

Examples

Custom reverse split

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

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

Specifications

Specification
ECMAScript® 2025 Language Specification # sec-symbol.split