Various JSON filter types

Looking at JSON and filtering out unwanted data with various methods. EACH / GREP and REMOVE

by Andrew Pougher

HTML

<div id="months"></div>
<hr>

<div id="names"></div>
<hr>
<div id="countries"></div>

JavaScript

$(document). ready(function() {
     
     countries= [
        {'id':'XX','name':'Afghanistan'},
    {'id':'AF','name':'Afghanistan'},
    {'id':'AL','name':'Albania'},
    {'id':'DZ','name':'Algeria'},
       {'id':'CH','name':'Suisse'},
       {'id':'OZ','name':'Down Under'}
];//r

var arr = [  
            { 'name': "robin", 'age': 19 },   
            { 'name': "tom", 'age': 29 },  
            { 'name': "tom", 'age': 29 },  
            { 'name': "tom", 'age': 29 },  
            { 'name': "test", 'age': 39 } 
          ];

 var months = [  
     {'tripstartdate':'January'},
     {'tripstartdate':'February'}, 
     {'tripstartdate':'March'},
     {'tripstartdate':'April'}, 
     {'tripstartdate':'May'},
     {'tripstartdate': 'June'},
     {'tripstartdate':'July'},
     {'tripstartdate':'August'},
     {'tripstartdate':'September'},
     {'tripstartdate':'October'},
     {'tripstartdate':'November'},
     {'tripstartdate': 'December'},
     {'tripenddate': 'January'},
     {'tripenddate': 'December'}];
// grep METHOD

       
        months = $.grep(months, function(value, i) {
       var f =  value['tripstartdate'];
       var r =  value['tripenddate'];
           return (f !== "April" && f !== "May" && f !== "December" && r !== "December");
        });
        $('#months').html( JSON.stringify(months));






// ONE METHOD
Array.prototype.remove = function(name, value) {  
    var rest = $.grep(this, function(item){    
        return (item[name] !== value); // <- You may or may not want strict equality
    });

    this.length = 0;
    this.push.apply(this, rest);
    return this; 
};

arr.remove("name", "test");
arr.remove("name", "tom");  



 $('#names').html(JSON.stringify(arr))

    
    // TWO METHOD IFFY
   $.each(countries, function(i, result) {
       if( result.id == 'XX' ) {
          //if anything else not equal XX
       return true
      }else if (result.id == 'AF'){ 
             return true
           }else{
              // otherwise...