JSFiddle - React, Tailwind, and code Playground

HTML

<script src="//cdn.rawgit.com/mrdoob/three.js/master/build/three.js"></script>

CSS

body {
	  margin: 0;
}

JavaScript

const x = 2;

const a = new THREE.Vector3();
const b = new THREE.Vector3( 0, 0, 1 );

const v = new THREE.Vector3();
v.subVectors( a, b );
v.normalize();
v.multiplyScalar( x );
v.add( b );

console.log( v );