CoffeeScript Example

Vector3.coffee

class Vector3
  add: (additional) ->
    new Vector3 @x + additional.x, 
                @y + additional.y, 
                @z + additional.z

  subtract: (subtrahend) ->
    new Vector3 @x - subtrahend.x,
                @y - subtrahend.y,
                @z - subtrahend.z

  divideScalar: (scalar) ->
    new Vector3 @x / scalar,
                @y / scalar,
                @z / scalar

  multiplyScalar: (scalar) ->
    new Vector3 @x * scalar,
                @y * scalar,
                @z * scalar

  magnitude: ->
    Math.pow Math.pow(@x, 2) + Math.pow(@y, 2) + Math.pow(@z, 2), 0.5

  normalize: ->
    this if magnitude == 0
    @divideScalar @magnitude

module.exports = Vector3

Vector3.js

function Vector3(x, y, z) {
  this.x = x
  this.y = y
  this.z = z
}

Vector3.prototype.add = function(additional) {
  return new Vector3(this.x + additional.x, this.y + additional.y, this.z + additional.z)
}

Vector3.prototype.subtract = function(subtrahend) {
  return new Vector3(this.x - subtrahend.x, this.y - subtrahend.y, this.z - subtrahend.z)
}

Vector3.prototype.divideScalar = function(scalar) {
  return new Vector3(this.x / scalar, this.y / scalar, this.z / scalar)
}

Vector3.prototype.multiplyScalar = function(scalar) {
  return new Vector3(this.x * scalar, this.y * scalar, this.z * scalar)
}

Vector3.prototype.magnitude = function() {
  return Math.pow(Math.pow(this.x, 2) + Math.pow(this.y, 2) + Math.pow(this.z, 2), 0.5)
}

Vector3.prototype.normalize = function() {
  var magnitude = this.magnitude();

  if (magnitude == 0) {
    return this
  }

  return this.divideScalar(this.magnitude())
}

module.exports = Vector3