• Verifies that the given value is not null. This especially helps with a .filter

    Type Parameters

    • T

    Parameters

    • x: null | T

    Returns x is T

    const values: (number | null)[] = [1, 2, null, 4];
    const nonNullValues: number[] = values.filter(isNotNull);
    // nonNullValues is now of type number[]