Posted By

segdeha on 06/04/09

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javascript
function

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Last Edited at 06/04/09 05:13pm

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When to use the prototype of a Function

/ Published in: JavaScript

Assign methods to a Function prototype when you intend to create instances of the type of object. Use object literals when you just need a container for functions.

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// consider:
function Grape(type) {
  this.type = type || 'Xynomavro';
}
 
Grape.prototype.squash = function () {
  return this.type.substring(0, 3);
};
 
var grape = new Grape();
 
alert(grape.squash());
 
// versus:
var grapes = {
  barrel : [],
  squash : function (grape) {
    return grape.substring(0, 3);
  }
};
 
grapes.barrel.push('Nebbiolo');
 
alert(grapes.squash(grapes.barrel[0]));