I need three js equivalent to my code


This is my code in some other language but whats the three js equivalent for this.
Here this code giving me an vector.


Subtract the start vector from the end vector.

let vStart = _vector;
let vEnd = _vector;
let result = new THREE.Vector3().subVectors(vEnd, vStart);
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Is there any way to check to check that direction vector is clockwise or anti?
I want a short way to calculate the azimuth. These are end points of my line and you showed how to get the direction vector. Any idea how to acheive this in three js. Any help on this