Function isNullOrUndefined

  • isNullOrUndefined(value): boolean

  • Checks if the provided value is null, undefined or contains the string value of "undefined".

    Parameters

    • value: any

      The value to check

    Returns boolean

    true if the value is null or undefined

    Example

    isNullOrUndefined(null);         // true
    isNullOrUndefined(undefined);    // true
    isNullOrUndefined("undefined");  // true

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

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

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