What advantages does incorporating "function() 'use strict'" into each individual file provide?

As I dive into revamping an older AngularJS 1.3 project, one striking observation is the consistent pattern of starting each AngularJS code file with:

(function () {
'use strict';

  angular.module('app').factory('Employees', ['$http', function($http) {
    // angular code removed
  }]);

})();

I can't help but wonder if using function() 'use strict' in every file adds any real value to the codebase. Personally, it seems like an unnecessary repetition that takes up precious lines in each file. Is there a recognized standard or best practice regarding this approach?

javascriptangularjs

Answer №1

Implementing the use strict statement can help prevent issues related to closures and variable scopes.

For instance, if you accidentally create a global variable - such as forgetting to include the var keyword in a for loop, using use strict mode will detect it and rectify the situation.

(function(){
  for (i = 0; i < 5; i++){
  }
  console.log(i);
})();
.as-console-wrapper { max-height: 100% !important; top: 0; }

(function(){
  'use strict';
  for (i = 0; i < 5; i++){
  }
  console.log(i);
})();
.as-console-wrapper { max-height: 100% !important; top: 0; }

Answer №2

Placing 'use strict'; outside of the IIFE will expose it globally.

This opens up the possibility for non-strict compliant code from other sources (such as libraries) to potentially create issues.

Similar to variable scope, enclosing 'use strict' within the IIFE ensures that it is only affecting your own code.

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