includes() function

检查指定的值是否相等。

There is another alias function called contains.

Signature:

declare function includes<T extends readonly []>(
  value: unknown,
  iterable: T,
): false;

Example

includes("c", "abcd"); // true
includes("e", "abcd"); // false
includes(3, [1, 2, 3, 4]); // true
includes(5, [1, 2, 3, 4]); // false

Open Source Code