1. Array.prototype.includes

    Determines whether or not an array includes the given value, returning a boolean value (unlike `indexOf`).

  2. ECMAScript 5

    Full support for the ECMAScript 5 specification. Features include `Function.prototype.bind`, Array methods like `indexOf`, `forEach`, `map` & `filter`, Object methods like `defineProperty`, `create` & `keys`, the `trim` method on Strings and many more.

  3. javascript built-in: array: indexof

  4. javascript built-in: array: lastindexof

  5. javascript built-in: string: indexof

  6. javascript built-in: string: lastindexof

  7. javascript built-in: typedarray: indexof

  8. javascript built-in: typedarray: lastindexof