What is the purpose of wrapping whole Javascript files in anonymous functions like “(function(){ … })()”?

Question

I have been reading a lot of Javascript lately and I have been noticing that the whole file is wrapped like the following in the .js files to be imported.

(f         


        

Answer 1

We should also use 'use strict' in the scope function to make sure that the code should be executed in "strict mode". Sample code shown below

(function() {
    'use strict';

    //Your code from here
})();