json index of property value

Question

I need to get the index of the json object in an array whose by the objects id

here is the example code

var list = [ { _id: \'4dd822c5e8a6c42aa7000         


        

Answer 1

a prototypical way

(function(){
  if (!Array.prototype.indexOfPropertyValue){
    Array.prototype.indexOfPropertyValue = function(prop,value){
      for (var index = 0; index < this.length; index++){
        if (prop in this[index]){
          if (this[index][prop] == value){
            return index;
          }
        }
      }
      return -1;
    }
  }
 })();
 // usage:

 list.indexOfPropertyValue('_id','4dd80b16e8a6c428a900007d'); // returns 1 (index of array);
 list.indexOfPropertyValue('_id','Invalid id') // returns -1 (no result);
 var indexOfArray = list.indexOfPropertyValue('_id','4dd80b16e8a6c428a900007d');
 list[indexOfArray] // returns desired object.