I would like to modify following code to list "hello world" from 'a' variable without passing it to function. Is it possible?
var a = "declared variable";
var fc = function () {
console.log(a);
};
(function () {
var a = "hello world";
fc();
}) ();
edit: Ah sorry ... I haven't mentioned. I don't want modify global variable. I just want get "scope" variable value.
Just remove the var
var a = "declared variable";
var fc = function () {
console.log(a);
};
(function () {
a = "hello world";
fc();
}) ();
The var defines the variable in the current scope.
In reaction to the edit, the only way to access the scope is to be in it (or pass it along as an argument). As you don't want to pass it along this is the only other option I see.
var a = "declared variable";
(function () {
var fc = function () {
console.log(a);
};
var a = "hello world";
fc();
}) ();
Or if you would want to pass the scope along a construction like this would work
var a = "declared variable";
var fc = function (scope) {
console.log(scope.a);
};
(function () {
this.a = "hello world";
fc(this);
}).apply({});
Very technically speaking it's not the scope you're passing along, but this is how it would be done.
Let me give you an alternative answer. Don't ever do that. This is an ugly hack that will break sooner or sooner, it is hard to debug and will slow you down. Don't be lazy, pass around that damn value, it will save you lots of time in the long run.
So my answer is, you can't achieve properly what you want without passing a.
var a = "declared variable";
var fc = function () {
console.log(a);
};
(function () {
var a = "hello world";
this.a = a; // assign a to global a
fc();
}) ();
