Javascript Closure Question

[dhsieh]

Hello all,

I have been trying to understand how JavaScript closures work but I have been struggling. In this code snippet that I created to test things, I can't figure out how to change the value of the variable a to "b" without passing an argument into the function or returning the value. Can someone please help? Also, does anyone know of a site that explains closures in simple detail? Thanks.

function a() {
    var a = "a";
    blah = function() {
        a = "b";
    }
    alert(a);
}
 

[dmjpro]

Hello all,

I have been trying to understand how JavaScript closures work but I have been struggling. In this code snippet that I created to test things, I can't figure out how to change the value of the variable a to "b" without passing an argument into the function or returning the value. Can someone please help? Also, does anyone know of a site that explains closures in simple detail? Thanks.

function a() {
    var a = "a";
    blah = function() {
        a = "b";
    }
    alert(a);
}
 

Look ...... two name coincides "function a" and "var a".
The main problem is not here.
Actually you can't change local references inside Closures :)
You have to declare it as "Global".

Debasis Jana

[dhsieh]

So this would effectively change the value of a to "b" globally?

var a = "a";
function test() {
    blah = function() {
        a = "b";
    }
    alert(a);
}
 

[dmjpro]

So this would effectively change the value of a to "b" globally?

var a = "a";
function test() {
    blah = function() {
        a = "b";
    }
    alert(a);
}
 

Call the function then see what happens.

alert(a);
blah();
alert(a)
 

Debasis Jana