Javascript global variable scope issue

Question

I am running into a strange scope issue with Javascript (see JSFiddle):

var someGlobal = 3;

function someF() {
    // undefined issue
    alert(someGlobal);         


        

Answer 1

Here is an example of how to use both the local and global variable inside someF by using this.

var someGlobal = 3;

function someF() {

    // Displays 3
    alert(someGlobal);
    this.someGlobal = 5;
    someGlobal = 5;
    // Displays 5
    alert(this.someGlobal);
}

function someF2() {
    // Displays 5
    alert(someGlobal);
}

someF();
someF2();

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