Function isStrictNullOrUndefined

  • isStrictNullOrUndefined(value): boolean

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

    Parameters

    • value: any

      The value to check

    Returns boolean

    Example

    isStrictNullOrUndefined(null);         // true
    isStrictNullOrUndefined(undefined);    // true
    isStrictNullOrUndefined("undefined");  // false

    let value = null;
    isStrictNullOrUndefined(value);        // true
    let value = undefined;
    isStrictNullOrUndefined(value);        // true

    isStrictNullOrUndefined("");           // false
    isStrictNullOrUndefined(0);            // false
    isStrictNullOrUndefined(new Date());   // false
    isStrictNullOrUndefined(true);         // false
    isStrictNullOrUndefined(false);        // false

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