Vector-Math

(function () {
    return {
        'add': (x, y) => { return [x[0] + y[0], x[1] + y[1]] },
        'multiply': (x, scalar) => { return [x[0] * scalar, x[1] * scalar] },
        'length': (x) => { return Math.sqrt(x[0] ** 2 + x[1] ** 2) },
        'dot': (x, y) => { return (x[0] * y[0]) + (x[1] * y[1]) },
        'cross': (x, y) => { return (x[0] * y[1]) - (y[0] * x[1]) }
    }
})()