It's just another way to create object by some template (or prototype).
Using "your" method: var o = Templater();
Using prototype: var o = new Template(); // see the 'new' keyword
Usage of created object is the same: o._supplant(...);
But also there's few differences in creating derived objects.
Using "your" method:
function DerivedTemplater() {
var parent = Templater;
parent.extraMethod = function() {};
return parent;
}
Using prototype:
function DerivedTemplater() {
}
DerivedTemplater.prototype = new Templater();
DerivedTemplater.prototype.constructor = DerivedTemplater;
DerivedTemplater.prototype.extraMethod = function() {};
It's up to you which method to choose.
Regards,
Max.
On Sat, Apr 9, 2011 at 9:46 AM, planon <[email protected]> wrote:
> I was reading Ben Cherry's blog post on Writing Testable Javascript
> and I came across this example:
>
> function Templater() {
> this._templates = {};
> }
>
> Template.prototype = {
> _supplant: function(str, params) {
> for (var prop in params) {
> str.split("{" + prop +"}").join(params[prop]);
> }
> return str;
> },
> render: function(name, params) {
> if (typeof this._templates[name] !== "string") {
> throw "Template " + name + " not found!";
> }
>
> return this._supplant(this._templates[name], params);
> },
> defineTemplate: function(name, template) {
> this._templates[name] = template;
> }
> };
>
>
>
> http://www.adequatelygood.com/2010/7/Writing-Testable-JavaScript
>
>
> My question is why does he use prototype to extend this function
> rather than writing it as:
>
> function Templater(){
> return {
> _supplant:function(){}
>
> etc...
> }
> }
>
> What is the use case for prototype-based extension?
>
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