Question

155

rated 0 times [ 157] [ 2] / answers: 1 / hits: 15932 / 14 Years ago, thu, april 15, 2010, 12:00:00

I identified a bug in my code which I hope to solve with minimal refactoring effort. This bug occurs in Chrome and Opera browsers.
Problem:

var obj = {23:AA,12:BB};

//iterating through obj's properties

for(i in obj)

  document.write(Key: +i + +Value: +obj[i]);

Output in FF,IE
Key: 23 Value: AA
Key: 12 Value: BB

Output in Opera and Chrome (Wrong)

Key: 12 Value BB

Key: 23 Value AA

I attempted to make an inverse ordered object like this

var obj1={AA:23,BB:12};

for(i in obj1)

  document.write(Key: +obj[i] + +Value: +i);

However the output is the same. Is there a way to get for all browser the same behaviour with small changes?

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2 Years ago

answered 14 Years ago kevonmoisesf · Accepted Answer

No. JavaScript Object properties have no inherent order. It is total luck what order a for...in loop operates.

If you want order you'll have to use an array instead:

var map= [[23, 'AA'], [12, 'BB']];

for (var i= 0; i<map.length; i++)

    document.write('Key '+map[i][0]+', value: '+map[i][1]);