Javascript generate dynamic multidimensional array

Question

Can anyone help me or give me sample/example for javascript code like what I explained?

I have array like this

    var obj = [ 
        {rgb : 'val1', x : '10', y : '15'}, 
        {rgb : 'val1', x : '20', y : '25'},  
        {rgb : 'val1', x : '30', y : '35'} 
    ];

I want array like this way

    var obj = { 
        'val1' : [ {x : '10', y : '15'}, {x : '20', y : '25'},  {x : '30', y : '35'} ] 
    };

Your desired outcome isn't valid - is `val1` supposed to be an array? — tymeJV, Oct 22 '14 at 20:37
That is not an array. it seems you do not know javascript at all..wouldn't it be best to learn the basics first? try Google lean javascript basics and give it 20 minutes before asking again such basic things. — vsync, Oct 22 '14 at 20:43
Maybe this helps: [Access / process (nested) objects, arrays or JSON](http://stackoverflow.com/q/11922383/218196) — Felix Kling, Oct 22 '14 at 20:44
I have a canvas with 2 lines drawn on it each with different RGB. I want array of coordinates for each line with RGB as key. — Maulik Umrania, Oct 22 '14 at 20:47

score 1 · Accepted Answer · answered Oct 22 '14 at 20:45

1

Something like this:

var newObj={};
for(var i=0, l = obj.length; i<l; i++){
  if (typeof newObj[obj[i].rgb] === 'undefined')
    newObj[obj[i].rgb] = []; 
  newObj[obj[i].rgb].push({ x: obj[i].x, y: obj[i].y })
}
obj = newObj;

answered Oct 22 '14 at 20:45

Malk

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score 0 · Answer 2 · answered Oct 22 '14 at 20:41

0

What you are going to want to do to have a 'map' type structure is this:

var obj = {
   'val1': [{x : '10'},{y : '10'}]
}

answered Oct 22 '14 at 20:41

Carlos Pliego

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I dont get this answer? – tymeJV Oct 22 '14 at 20:42
Unless I misunderstood the question, isn't he trying to create a map in JavaScript? – Carlos Pliego Oct 22 '14 at 20:43
OP is trying to convert a current array of objects to a different format - I dont see how this answer helps? – tymeJV Oct 22 '14 at 20:44

Javascript generate dynamic multidimensional array

2 Answers2