CODEWITHSUNDEEP
javascript
user1853788
user1853788

Reputation:

call variable inside a function

I have a function something like this:

var func1 = function () {
       var apple;
       //Some other code
};

and I have passed the function as a parameter for some other function

control(func);

Now, I want to access the variable apple in the control function. func1.apple doesn't work. Does anyone have an idea how this is do-able?

Upvotes: 1

Views: 66

Answers (2)

Ryan O'Neill
Ryan O'Neill

Reputation: 1790

I think what you may be looking for is the constructor pattern

var func1 = function () {
       this.apple = "My Apple";
};

var myFuncInstance = new func1();

myFuncInstance.apple; // "My Apple"

Upvotes: 0

Ry-
Ry-

Reputation: 224859

It’s not really possible using that sort of syntax without changing the function. func1.apple doesn’t run apple, and something like func1().apple would have already run apple. If you just want to return something, then do so using return:

var func1 = function() {
    var apple;
    …
    return apple;
};

var apple = func1();

Or return an object if you have several values to return:

var func1 = function() {
    var apple;
    …
    return {apple: apple};
};

var apple = func1().apple;

If you need the value during the function’s run, the only* way to accomplish this is to use another callback within your callback:

var func1 = function(useApple) {
    var apple;
    …
    useApple(apple);
    …
};

func1(function(apple) {
    // Do something with apple
});

* Properties are another way, but they count as callbacks and are evil :)

Upvotes: 2

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