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Referencing a variable from another method in Javascript

To define a single global-scoped variable, and dumping your variables there:

var MyApp = {}; // Globally scoped object

function foo(){
    MyApp.color = 'green';

function bar(){
    alert(MyApp.color); // Alerts 'green'

If your program is fairly small then globals are not so bad. Otherwise I would consider using the third method:

function A()
    var rand_num = calculate_random_number();

function B(r)


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