dot product checking

function getNormalized(point) {
    var norm = Math.sqrt((point.x * point.x) + (point.y * point.y));
    var normalized = { x: 0, y: 0 };
    if (norm != 0) {
        normalized.x = point.x / norm;
        normalized.y = point.y / norm;
    }
    return normalized;
}

function subtractVectors(v1, v2) {
    return {
        x: (v1.x - v2.x),
        y: (v1.y - v2.y)
    };
}

function getDistance(v1, v2) {
    var newV = subtractVectors(v1, v2);
    return Math.abs(Math.sqrt(newV.x * newV.x + newV.y * newV.y));
}

function dotProduct(vectorA, vectorB) {
    return (vectorA.x * vectorB.x) + (vectorA.y * vectorB.y);
}

function getDegrees(angle) {
    return angle * (180 / Math.PI);
}

function test() {
    var guardPos = { x: 1, y: 3 };
    var guardFacing = { x: 1, y: 1 };
    var heroPos = { x: 3, y: 2 };

    var guardFacingNormalized = getNormalized(guardFacing);
    console.log("guardFacingNormalized", guardFacingNormalized);

    var heroMinusGuardPos = subtractVectors(heroPos, guardPos);
    console.log("heroMinusGuardPos", heroMinusGuardPos);
    var guardToHero = getNormalized(heroMinusGuardPos);
    console.log("guardToHero", guardToHero);

    var angle = Math.acos(dotProduct(guardFacingNormalized, guardToHero));

    console.log("angle is ", getDegrees(angle));
}