Method isNegativeStrict

src/AutoNumericHelper.js:532–534

* Return `true` if the given string contains a negative sign on the first character (on the far left). * * @example isNegativeStrict('1234.56') => false * @example isNegativeStrict('1234.56-') => false * @example isNegativeStrict('-1234.56') => true * @example isNe

(numericString, negativeSignCharacter = '-')

     * @returns {boolean}
     */
    static isNegativeStrict(numericString, negativeSignCharacter = '-') {
        return numericString.charAt(0) === negativeSignCharacter;
    }

    /**
     * Return `true` if the very first character is the opening bracket, and if the rest of the `valueString` also has the closing bracket.