EJS Exercise - Vector.js

export function Vector (x, y) {
    this.x = x;
    this.y = y;
}

Vector.prototype = {
    plus: function (vector) {
        return new Vector(this.x + vector.x, this.y + vector.y);
    },
    minus: function (vector) {
        return new Vector(this.x - vector.x, this.y - vector.y);
    },
    get length () {
        return Math.sqrt(this.x * this.x + this.y * this.y);
    }
}

let v = new Vector(10, 10);
v.plus(new Vector(1, 1));
Vector {x: 11, y: 11}
v.length
// 10.954451150103322

EJS Exercise - Vector.test.js

import { Vector } from './EJS Exercise - Vector.js';

function test_vector () {
  function test_creation () {
    let vecA = new Vector(10, 20);
    let vecB = new Vector(20, 30);
    console.log(vecA.x === 10);
    console.log(vecA.y === 20);
    console.log(vecB.x === 20);
    console.log(vecB.y === 30);
  }
  function test_plus () {
    let vecA = new Vector(10, 20);
    let vecB = new Vector(20, 30);
    let vecC = vecA.plus(vecB);
    console.log(vecA.x + vecB.x === vecC.x);
    console.log(vecA.y + vecB.y === vecC.y);
  }
  function test_minus () {
    let vecA = new Vector(10, 20);
    let vecB = new Vector(20, 30);
    let vecC = vecA.minus(vecB);
    console.log(vecA.x - vecB.x === vecC.x);
    console.log(vecA.y - vecB.y === vecC.y);
  }
  function test_length () {
    let vecA = new Vector(10, 20);
    let vecB = new Vector(20, 30);
    console.log(vecA.length === Math.sqrt(500));
    console.log(vecB.length === Math.sqrt(1300));
  }
  test_creation();
  test_plus();
  test_minus();
  test_length();
}
test_vector();