Usage of jQuery filter array grep each inArray map and traversing json objects

Purely documenting several uses:

jquery grep() Filter Traversal Array

$().ready(
  function(){
    var array = [1,2,3,4,5,6,7,8,9];
    var filterarray = $.grep(array,function(value){
      return value > 5;// Filter greater than 5 Of 
    });
    for(var i=0;i<filterarray.length;i++){
      alert(filterarray[i]);
    }
    for (key in filterarray){
      alert(filterarray[key]);
    }
  }
);

jquery each() Filter Traversal Array

$().ready(
  function(){
    var anObject = {one:1,two:2,three:3};// Yes json array each
    $.each(anObject,function(name,value) {
      alert(name);
      alert(value);
    });
    var anArray = ['one','two','three'];
    $.each(anArray,function(n,value){
      alert(n);
      alert(value);
    }
    );
  }
);

jquery inArray() Filter Traversal Array

$().ready(
  function(){
    var anArray = ['one','two','three'];
    var index = $.inArray( ' two',anArray);
    alert(index);// Returns the key value of the value in the array, returns 1
    alert(anArray[index]);//value is two
  }
);

jquery map() Filter Traversal Array

$().ready(
  function(){
    var strings = ['0','1','2','3','4','S','6'];
    var values = $.map(strings,function(value){
        var result = new Number(value);
        return isNaN(result) ? null:result;//isNaN:is Not a Number Abbreviations for 
      }
    );
    for (key in values) {
      alert(values[key]);
    }
  }
);

jquery traversal parses json object 1:

var json = [{dd:'SB',AA:' East East ',re1:123},{cccc:'dd',lk:'1qw'}];
for(var i=0,l=json.length;i<l;i++){
  for(var key in json[i]){
    alert(key+':'+json[i][key]);
  }
}

jquery Traversal Resolves json Object 2

// There are  json Object: 
var obj ={ " name " : "Feng Juan" , " password " : " 123456 ″ , " department " : "Technology Department" , " sex " : "   "Women" , " old " :30};
// Traversal method: 
for(var p in obj){
  str = str+obj[p]+',';
  return str;
}