Function isUndefined

  • isUndefined<T>(value): value is undefined

  • Checks if value is undefined, acts as a typescript safeguard.

    Type Parameters

    • T

    Parameters

    • value: undefined | T

    Returns value is undefined

    Example

    [null, undefined, 1, 5].filter(isUndefined)
    > [undefined]

    [null, undefined, 1, 5].filter(isNot(isUndefined))
    > [null, 1, 5]

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