Method isZeroOrHasNoValue

src/AutoNumericHelper.js:555–557

* Return `true` if the formatted or unformatted numeric string represent the value 0 (ie. '0,00 €'), or is empty (' €'). * This works since we test if there are any numbers from 1 to 9 in the string. If there is none, then the number is zero (or the string is empty). * * @param {strin

(numericString)

     * @returns {boolean}
     */
    static isZeroOrHasNoValue(numericString) {
        return !(/[1-9]/g).test(numericString);
    }

    /**
     * Return the negative version of the value (represented as a string) given as a parameter.