Method isUndefined

src/danfojs-base/shared/utils.ts:84–86

* Checks if a value is undefined * @param value The value to check. * @returns

(value: T)

     * @returns 
     */
    isUndefined<T>(value: T): boolean {
        return typeof value === "undefined";
    }

    /**
     * Checks if a value is empty. Empty means it's either null, undefined or NaN.