Question

Here is my self-executing function:

var incrementInt = (function() {
    var manyOut = 10;

    if(incInt) {
        incInt+=manyOut;
    } else {
        var incInt = 0;
    }

    return {
        s: incInt,
        m: manyOut
    };
})();

I have privatized the variables incInt and manyOut, and tied the variable incrementInt to the returned object.

My goal is to create a function that returns an object where one property is an integer that increments every time that it is called. I would like the incrementing variable to have the most narrow scope possible.

My problem with the solution I have above is that the variable incInt is re-initialized every time the function is called. Due to its scope within the function, the variable is destroyed automatically.

Answer 1

You’ll need to use methods to add and get the variable incInt.

var incrementInt = (function() {
    var manyOut = 10,
        incInt = 0;

    return {
        add: function() {
            return incInt += manyOut;
        },
        getInt: function() {
            return incInt;
        }
    };

})();


var a = incrementInt;


a.add();
a.add();

a.getInt(); // 20​​​​​​