Circular shift on a javascript array

cricular-shift.js

// performs a circular shift on an array (i < 0 ? right : left)
Object.defineProperty(Array.prototype, 'rotate', {
    enumerable: false,
    value: function (i) {
        if (i == 0) return this;
        const s = (this.splice).apply(this, i < 0 ? [i] : [0, i]);
        (i < 0 ? this.unshift : this.push).apply(this, s);
        return this;
    }
});