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how to loop through an array with nested objects using jquery?
var msg = [ {name: ["a1", "a2"], value: "this is A"},
            {name: ["b1", "b2"], value: "this is B"},
            ...
          ]

var my_param = 'b1';

// This is an object, so we can have key/value pairs
var error_codes =
{
    'a1': 0,
    'a2': 0,
    'b1': 1,
    'b2': 1
};

// This is an array because we only need values
var error_messages =
[
    'This is A',
    'This is b'
];

alert(error_messages[error_codes[my_param]]);

var error_codes = { 'a1': 1, }; // NO!

var value;
$.each(msg, function (i, el) {
  if (el.name.indexOf(name) >= 0) {
    value = el.value;
    return false;  // Stops iteration.
  }
});

var getMessage = function (name)
{
    var msg = [ ... ];

    for(var i = 0; i < msg.length; ++ i)
        if (msg [i].name.indexOf (name) != -1)
            return msg [i].value;
}

var myMsg = findMsg('a1')


function findMsg(msgType){
  msg.forEach(function(obj){
    if(inArray(msgType, obj.name) !== -1){
      return obj.value
    }
  })
}

function inArray(key, obj){
 return obj.join().indexOf(key)
}