A function inside a function constructor in JavaScript

Question

Suppose I have this code:

function Graph() {
  this.vertices = [];
  this.edges = [];
}

Graph.prototype = {
  addVertex: function(v){
    this.vertices.push(v);
  }
};

Is it possible to add the addVertex property name inside function Graph() and thus eliminate the second part of this code altogether (from where Graph.prototype = begins)? I've tried this but it doesn't work:

function Graph() {
  this.vertices = [];
  this.edges = [];
  addVertex = function(v){
    this.vertices.push(v);
  };
}

Gauvar Sacnchan's answer is correct but if you wan't to attach the function to the prototype of the object you should change this.addVertex with Graph.prototype.addVertex — memo, Oct 30 '15 at 14:03

score 0 · Answer 1 · edited Oct 30 '15 at 14:04

0

Yes, you can do this in the following manner:

function Graph() {
  this.vertices = [];
  this.edges = [];
  this.addVertex = function(v){
    this.vertices.push(v);
  }; 
 return this;
}

edited Oct 30 '15 at 14:04

Wes Foster

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answered Oct 30 '15 at 13:25

Gaurav Sachan

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A function inside a function constructor in JavaScript

1 Answers1