Array.prototype.reduce()
, Math.pow()
and Math.sqrt()
to calculate the magnitude of each vector and the scalar product of the two vectors.Math.acos()
to calculate the arccosine and get the theta value.const vectorAngle = (x, y) => {
let mX = Math.sqrt(x.reduce((acc, n) => acc + Math.pow(n, 2), 0));
let mY = Math.sqrt(y.reduce((acc, n) => acc + Math.pow(n, 2), 0));
return Math.acos(x.reduce((acc, n, i) => acc + n * y[i], 0) / (mX * mY));
};
vectorAngle([3, 4], [4, 3]); // 0.283794109208328
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