atan2 < Math < JavaScript

The Math atan2() static method returns the angle in the plane (in radians) between the positive x-axis and the ray from (0, 0) to the point (x, y), for Math.atan2(y, x).

    
    function calcAngleDegrees(x, y) {
      return (Math.atan2(y, x) * 180) / Math.PI;
    }

    console.log(calcAngleDegrees(5, 5));
    // 45

    console.log(calcAngleDegrees(10, 10));
    // 45

    console.log(calcAngleDegrees(0, 10));
    // 90