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Javascript Object Orientation with getter function
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| // Your code here. | |
| function Vector(x, y) { | |
| this.x = x; | |
| this.y = y; | |
| this.plus = function(v) { | |
| var res = new Vector(this.x, this.y); | |
| res.x += v.x; | |
| res.y += v.y; | |
| return res; | |
| } | |
| this.minus = function(v) { | |
| var res = new Vector(this.x, this.y); | |
| res.x -= v.x; | |
| res.y -= v.y; | |
| return res; | |
| } | |
| this.toString = function() { | |
| return "Vector{x: " + this.x + ", y: " + this.y + "}"; | |
| } | |
| /* the following is invalid in javascript, what a weird language */ | |
| /* | |
| get length() { | |
| return Math.sqrt(Math.pow(this.x, 2) + Math.power(this.y, 2)); | |
| }*/ | |
| } | |
| Vector.prototype = { | |
| get length() { | |
| return Math.sqrt(Math.pow(this.x, 2) + Math.pow(this.y, 2)); | |
| } | |
| } | |
| console.log(new Vector(1, 2).plus(new Vector(2, 3))); | |
| // → Vector{x: 3, y: 5} | |
| console.log(new Vector(1, 2).minus(new Vector(2, 3))); | |
| // → Vector{x: -1, y: -1} | |
| console.log(new Vector(3, 4).length); | |
| // → 5 |
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