CODEWITHSUNDEEP
javascript
Alosyius
Alosyius

Reputation: 9121

Loop through multidimensional array

How can i loop through the below multidimensional array?

I am creating the array like this:

var _cQueue = [[]];

And adding items like this:

var valueToPush = new Array();
valueToPush['[email protected]'] = '1234567';
_cQueue.push(valueToPush);

I want to loop through all different email adresses that are added, and then each random string associated with that email

Any ideas?

Upvotes: 1

Views: 10386

Answers (2)

Denys Séguret
Denys Séguret

Reputation: 382130

First, you should not add elements to arrays by key, but to objects. Which means your global object should be build as :

var _cQueue = [];
var valueToPush = {}; // this isn't an array but a js object used as map
valueToPush['[email protected]'] = '1234567';
_cQueue.push(valueToPush);

Then, you iterate using two kinds of loops :

for (var i=0; i<_cQueue.length; i++) { // iterate on the array
   var obj = _cQueue[i];
   for (var key in obj) { // iterate on object properties
      var value = obj[key];
      console.log(value);
   }
}

See MDN's excellent Working with objects.

If you want to find the email associated to an id, you can do two things :

1) loop until you find it :

function find(id) {
    for (var i=0; i<_cQueue.length; i++) { // iterate on the array
       var obj = _cQueue[i];
       for (var key in obj) { // iterate on object properties
          var value = obj[key];
          if (value==id) return key;
       }
    }
}

2) put all the ids in a map so that it can be found faster :

   var bigMap = {};
   for (var i=0; i<_cQueue.length; i++) { // iterate on the array
       var obj = _cQueue[i];
       for (var key in obj) { // iterate on object properties
          bigMap[obj[key]] = key; // maps the id to the email
       }
    }
    function find(id) {
        return bigMap[id];
    }

Upvotes: 8

Adidi
Adidi

Reputation: 5253

use for-in to both levels: 

for(var val in _cQueue){
var obj = _cQueue[val];
   for(var val1 in obj){
    alert('key(email):' + val1 + '\nValue:' + obj[val1]);
   }
}

Upvotes: -1

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