How to partition or divide an array (of objects) into specific number of chunks, possibly using lodash

Question

I tried couple of way but not getting the result as expected.

Say that I have array of objects like this:

var users = [
  { 'user': 'barney', 'age': 36, 'active': false },
  { 'user': 'fred',   'age': 40, 'active': true },
  ... and so on (n lenght) ...
];

I wanted to divide them into two or three groups. If I have 100 objects and I like them to be divided in 3 groups, then the result with first and second group should contain 33 objects and the last group should contain 34 objects (or any other best possible way remaining objects distributed).

I tried to use lodash's chunk but that does things completly different :)

console.log(_.chunk(users, 2)) // this will create 50 chunks of 2 objects

Edited my question to explain more.

var my arrayOfObj = [1,2,3,4,5,6,7,8,9,10]
myArray.dividThemIn(3) // when run this, I am getting chunks like below
[{1,2,3}, {4,5,6}, {7,8,9}, {10}] // I am finding code that does this
[{1,2,3,4}, {5,6,7,8}, {9,10}] // But I need the code that does this

Please do some research before asking.. there are at least a few duplicates of this exact question on SO. — I wrestled a bear once.
– I wrestled a bear once., Commented Feb 14, 2018 at 18:05
@Occam'sRazor, I did research, either I am doing something wrong or for my luck I am not getting I want. Anyhow, Edited my question to explain more, kindly have a look. — Syed
– Syed, Commented Feb 14, 2018 at 20:28
@GeorgeJempty - How is it more than chunking an array? it's an exact duplicate as far as I can tell.. this is the code given in the other answer, applied to his example and it provides the exact requested results. - maybe if i knew what the lodash chunk function did i would understand the question better — I wrestled a bear once.
– I wrestled a bear once., Commented Feb 14, 2018 at 20:49

Dexygen · Accepted Answer · 2018-02-14 20:47:51Z

8

Divide the length of the array by the number of chunks you want (rounding up), and pass that into _.chunk as the second parameter:

var arrayOfObj = [1,2,3,4,5,6,7,8,9,10];
var chunks = _.chunk(arrayOfObj, Math.ceil(arrayOfObj.length / 3));
console.log(JSON.stringify(chunks)); //[[1,2,3,4],[5,6,7,8],[9,10]]

answered Feb 14, 2018 at 20:47

Dexygen

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Tim Han · Accepted Answer · 2018-02-14 20:41:52Z

-1

If you just want to split them into 3 groups without any criteria.

function splitIntoThree(arr){
  let result = [[],[],[]],
      thirds = Math.ceil(arr.length/3);

  arr.forEach((obj,index) => {
    if(index < thirds){
      result[0].push(obj);
    } else if(index < 2*thirds) {
      result[1].push(obj);
    } else {
      result[2].push(obj);
    }
  });

  return result;
}

answered Feb 14, 2018 at 20:41

Tim Han

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Drewness · Accepted Answer · 2018-02-14 21:01:40Z

-1

You could use something like this.

function chunk (arr, chunks) {
    var chunked = [];
    var itemsPerChunk = Math.ceil(arr.length / chunks);

    while (arr.length > 0) {
        chunked.push(arr.slice(0, itemsPerChunk));
    }

    return chunked;
}

var data = [1,2,3,4,5,6,7,8,9,10];

chunk(data, 3);
// [[1,2,3,4], [5,6,7,8], [9,10]]

answered Feb 14, 2018 at 21:01

Drewness

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