Function isStrictUndefined

  • isStrictUndefined(arg): arg is undefined

  • Checks if the provided value is undefined, a string value of "undefined" is NOT considered to be undefined.

    Parameters

    • arg: any

      The value to check

    Returns arg is undefined

    true if the typeof value === UNDEFINED

    Example

    isStrictUndefined(undefined);    // true

    isStrictUndefined(null);         // false
    isStrictUndefined("null");       // false
    isStrictUndefined("undefined");  // false
    isStrictUndefined("1");          // false
    isStrictUndefined("aa");         // false
    isStrictUndefined(new Date());   // false
    isStrictUndefined(0);            // false
    isStrictUndefined(1);            // false
    isStrictUndefined("");           // false

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