[js] 移除jsonArray 當中某一項 | remove specific object from json arrray

var countries = {};

countries.results = [
    {id:'AF',name:'Afghanistan'},
    {id:'AL',name:'Albania'},
    {id:'DZ',name:'Algeria'}
];


Array.prototype.removeValue = function(name, value){
   var array = $.map(this, function(v,i){
      return v[name] === value ? null : v;
   });
   this.length = 0; //clear original array
   this.push.apply(this, array); //push all elements except the one we want to delete
}

說明:

countries.results.removeValue('name', 'Albania');
//移除掉key為'name' ,value為'Albania' 的那項item

Array.prototype.removeValue
//為Array這個object增加removeValue這個function.

var array = $.map(this, function(v,i){
     return v[name] === value ? null : v;
});
//jquery的traversing object功能， callback function裡面
//可以程式來對object做動作，做完再回傳到呼叫他的地方.

this.push.apply(this,array)
//將array所有內容家到原本的array裡面，
你可以想成jabva的 addAll


總結:
說穿了其實就是把json array 用for-loop跑完，
將符合標準的取出. 
最後再放回json array裡面



//===============================================================
ref:
http://api.jquery.com/jquery.map/
http://codex.wiki/post/147898-659/
http://stackoverflow.com/questions/1374126/how-to-extend-an-existing-javascript-array-with-another-array