group by array of array [duplicate]

Question

I have an array, which is currently grouped like this:

{
  data: [ListingModel, ListingModel, ListingModel, ListingModel, ListingModel, ListingModel]
};

I'd like it to be grouped like this:

{
  groupedData: [
    [ListingModel, ListingModel],
    [ListingModel, ListingModel],
    [ListingModel, ListingModel]
  ]
};

So you mean to pair them up? Have you tried anything for yourself yet? Please include that — musefan
– musefan, Commented Sep 11, 2015 at 9:38
Chunk in underscorejs answered here http://stackoverflow.com/questions/8566667/split-javascript-array-in-chunks-using-underscore-js — Nico Vignola
– Nico Vignola, Commented Sep 11, 2015 at 9:46

musefan · Accepted Answer · 2015-09-11 09:44:56Z

1

Just loop the input 2 at a time, and create a new array for each pair. This new array then gets added to an overall result array...

var groupedData = [];

for(var i = 0; i < data.length; i+=2){
    groupedData.push([data[i], data[i+1]]);
}

You may want to add validation in the event you have an odd number of elements.

Here is a working example, I just used strings in this example for the ListingModel as you don't define that in your question.

edited Sep 11, 2015 at 9:44

answered Sep 11, 2015 at 9:39

musefan

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Comments

Hardeep Singh · Accepted Answer · 2015-09-11 09:47:46Z

1

var group_data = [];

for (var i = 0; i < data.length; i+=2)
{
    var arr = [];
    arr.push(data[i]);
    if ( (i + 1) < data.length)
    {
        arr.push(data[i + 1]);
    }

    group_data.push(arr); //push to main array
}

edited Sep 11, 2015 at 9:47

answered Sep 11, 2015 at 9:42

Hardeep Singh

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1 Comment

musefan Over a year ago

Could you ask your friends to also upvote my answer please, much appreciated :)

Jack jdeoel · Accepted Answer · 2015-09-11 10:17:08Z

0

u see to change associative array from single array

var data=['ListingModel', 'ListingModel2', 'ListingModel3',   'ListingModel4',' ListingModel5', 'ListingModel6'];
var new_arr = new Array();
for(var i in data){        
if(i < 3){      
    new_arr[i] = [data[i*2],data[i*2+1]];            
}
}
console.log(new_arr);

answered Sep 11, 2015 at 10:17

Jack jdeoel

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Comments

Sherali Turdiyev · Accepted Answer · 2015-09-11 11:34:16Z

0

If i understand your question, try this.

var data = [1, 2, 3, 4, 5];
    var result = [];
    for (var i = 0, len = data.length / 2; i < len; i++) {
      var two = [];
      
        if (data[2 * i]) {
            two.push(data[2 * i])
        }
        if (data[2 * i+1]) {
            two.push(data[2 * i+1])
        }
      result.push(two);
    }
    console.log(result);//output: [[1, 2], [3, 4], [5]]

edited Sep 11, 2015 at 11:34

answered Sep 11, 2015 at 10:15

Sherali Turdiyev

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2 Comments

musefan Over a year ago

Don't reference other answers. In this case it kind of makes yours redundant as you are acknowledging that there is already an answer very similar to yours, so why bother posting your answer at all

Sherali Turdiyev Over a year ago

Thanks for advice, @musefan. I didn't copy others answer. I tried to find optimum way(faster way).

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