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Here’s a simple trick to avoid having to call new on a constructor. All you have to do is have the constructor do it for you. Here’s how.
Check if the `this` variable is an instanceof of the Constructor. If not, then return a new instance of the constructor whiling passing the same arguments. `new ConstructorName(arg1, arg2, … argN)`.
If you call a constructor without using this trick, `this` will be referenced to the scope to which the constructor is contained within. Which in most cases is `window`.
Example:
var Person = function( name ){ if(!(this instanceof Person)){ return new Person(name); } this.name = name || "NA" ; return this; }; |
Live Demo:*click the results tab*
