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Way in JS to call singleton library methods within a namespace without fully qualifying the namespace in references

/ Published in: JavaScript
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  1. ;(function() {
  2.   MyClass = {
  3.     map: function(object, callback) {
  4.       var items = [];
  5.       each(object, function(i) { items.push(callback.apply(this, arguments)); });
  6.       return items;
  7.     },
  8.  
  9.     each: function(object, callback) {
  10.       for (var i = 0; i < object.length; i++) {
  11.         callback(i);
  12.       }
  13.     }
  14.   }
  15.  
  16.   var methods = 'each map'.split(/ /);
  17.   while (methods.length) { eval('var ' + methods[0] + ' = MyClass.' + methods.shift()); }
  18. })();
  19.  
  20. // Map can refer to each without dereferencing
  21. result = MyClass.map([1, 2, 3], function(i) {
  22.   return i + 1;
  23. });
  24.  
  25. print(result);
  26. // 1,2,3

URL: http://dailyjs.com/2010/03/19/private-vars-scope

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