Method and Function in Constructor

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Difference between a method and a function 33 answers

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All methods are functions; not all functions are methods. Using your example:

function myObj() {

    this.result = "RESULT: ";

    // is this a method or a function ?
    function innerFunc(a, b) {
        return a + b;
        //alert(this.result) not possible
    }

    this.sum = function(a, b) {
      alert(this.result + innerFunc(a, b));
    }  
} 

If you did var x = new myObj(); you would have x that has two properties: result , which is set to "RESULT: ", and sum , which is a function that takes 2 args.

However, it would not have a property on it called innerFunc . That is solely available from inside the x , ie either in the constructor or a method, eg sum .

So x.sum is a method, which is a function, but innerFunc is a function which is not a method.

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