Hello,
I would like to find a value in an data-object. (Has the given ID a true 
ajax-flag?)
I made this to find the value:
http://jsfiddle.net/K7WfE/6/

//the data object
var obj = {
'apple' : { 'id': '123', 'valid' : 0 , 'ajax' : 1 } ,
'bwe' :   { 'id': '456', 'valid' : 1 , 'ajax' : 1 } ,
'na' :    { 'id': '789', 'valid' : 0 , 'ajax' : 0 } ,
'ana' :   { 'id': '345', 'valid' : 1 , 'ajax' : 1 } ,    
};

var ajax = [];  //to store the result
for( var name in obj ) {
    if(obj[name].valid ==true) ajax.push(obj[name].id );    
}
console.log(ajax);

var search = '456'; //given ID

var info = ajax.contains(search); //gives the status back.

console.log("Info: ",info);

I think this is not very elegant.
Is there a better mootools way?
thanks for any suggestion in advance

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