Base.js - override example question

JavaScript
1

See the override example from Base.js.

The constructor returns an instance. Is this required? It works fine if the constructor has no return value.

Code:

Ext.define('My.Cat', {
   constructor: function() {
       alert("I'm a cat!");
   }
});


Ext.define('My.CatOverride', {
   override: 'My.Cat',
   constructor: function() {
       alert("I'm going to be a cat!");

       var instance = this.callParent(arguments);

       alert("Meeeeoooowwww");

       return instance;
   }
});

Also, the default constructor returns this, but I don’t see that subclasses (e.g. components) return this, so why does the default constructor return this? Should the default constructor be an empty function?

Code:

// Default constructor, simply returns `this`
constructor: function() {
    return this;
},

Ext.ClassManager has multiple inline examples where the constructor returns this.

5

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