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Checking Object Properties

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http://blog.ramonlechuga.com/2010/10/20/checking-object-structure/

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  1. /*
  2. * Some frameworks & browsers include this array method
  3. */
  4. Array.prototype.some = function(fn, thisObj) {
  5.   var scope = thisObj || window;
  6.   for ( var i=0, j=this.length; i < j; ++i ) {
  7.     if ( fn.call(scope, this[i], i, this) ) {
  8.       return true;
  9.     }
  10.   }
  11.   return false;
  12. };
  13.  
  14.  
  15. function isSet (object, string) {
  16.   if (!object) return false;
  17.   var childs = string.split('.');
  18.   if (childs.length > 0 ) {
  19.     return !childs.some(function (item) {
  20.       if (item in object) {
  21.         object = object[item]; 
  22.         return false;
  23.       } else return true;
  24.     });
  25.   } else if (string in object) { 
  26.     return true;
  27.   } else return false;
  28. }
  29.  
  30. var object = {
  31.   data: {
  32.     item: {
  33.       sub_item: {
  34.         bla: {
  35.           here : {
  36.             iam: true
  37.           }
  38.         }
  39.       }
  40.     }
  41.   }
  42. };
  43.  
  44. console.log(isSet(object,'data.item')); // true
  45. console.log(isSet(object,'x')); // false
  46. console.log(isSet(object,'data.item')); // true
  47. console.log(isSet(object,'data.item.sub_item.bla.here.iam')); // true

URL: http://blog.ramonlechuga.com/2010/10/20/checking-object-structure/

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