Method back

javascript/1472-design-browser-history.js:21–24

* @param {number} steps * @return {string}

(steps)

     * @return {string}
     */
    back(steps) {
        this.current = Math.max(this.current - steps, 0);
        return this.history[this.current];
    }

    /**
     * @param {number} steps