CODEWITHSUNDEEP
javascriptarrays
zergussino
zergussino

Reputation: 821

javascript associative array with leading zero properties sorting

I have the following JSON:

var somearr = {
"08":{val:blabla,val:blabla},
"09":{val:blabla,val:blabla},
"10":{val:blabla,val:blabla},
"11":{val:blabla,val:blabla},
...
"14":{val:blabla,val:blabla}
}

when doing 

 for (  i in somearr) {   
   console.log(i);
 }

I got this sequence: 10, 11, ... 14, 08, 09

How can the original sort order be achieved?

Thanks in advance for help.

Upvotes: 0

Views: 634

Answers (3)

Tim Down
Tim Down

Reputation: 324567

The iteration order of properties using for...in is specified as being implementation-specific, and browsers do vary. Therefore if you need a particular order, you must use an array, which you can then sort and iterate over using a for loop. Here's how you can do it:

var keys = [];
for (var name in somearr) {
    if (somearr.hasOwnProperty(name)) {
        keys.push(name);
    }
}

keys.sort();

for (var i = 0; i < keys.length; ++i) {
    console.log(keys[i] + "=>" + somearr[keys[i]]);
}

Upvotes: 1

ktusznio
ktusznio

Reputation: 3595

Put the keys into an array, sort it, then iterate over it, and pull from the object.

Using Underscore.js:

var keys = _.keys(somearr).sort();
_.each(keys, function(key) {
  var value = somearr[key];
  console.log(value);
});

Upvotes: 1

J.S. Taylor
J.S. Taylor

Reputation: 761

The type of somearr you defined is a map(dict) not an array. You can define an array by using [] e.g.

var somearr = [{val:blabla,val:blabla}, {val:blabla,val:blabla}, {val:blabla,val:blabla}];
for(var i in somearry) {
    console.log(i);
}

You'll get what you want

Upvotes: 2

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