Function includes

Checks if a value is included in a source array or string.

Example

includes(1)([1, 2, 3]); // => true
includes(1)([2, 3]); // => false
includes({})({}); // => false, because they hold different references
  • includes<V>(
        search: V,
        startIndex?: number,
    ): (
        source: V extends string
            ? string
            | readonly unknown[]
            : readonly unknown[],
    ) => boolean

    Type Parameters

    • V

    Parameters

    • search: V
    • OptionalstartIndex: number

    Returns (
        source: V extends string
            ? string
            | readonly unknown[]
            : readonly unknown[],
    ) => boolean