Sorting an array based on parameter array length

Question

So I have an array, for example -

[
  {
    "data": [
       1, 2, 3
    ]
  },
  {
    "data": [
      2, 3, 4, 5
    ]
  }
]

I need to sort the main array based on the length of data. So first comes the object with largest data array and last comes object with smallest data array, in this case it would be sorted in reverse order.

How can I do that?

JSFiddle: https://jsfiddle.net/tk7nybkq/

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"I need to sort the main array based on the length of data. […] How can I do that?" – You do it by writing a program which does that. If you have a problem with your program, carefully read the documentation of all the methods, classes, modules, and libraries you are using, write tests for your programs, trace the execution with pen and paper, single-step it in a debugger, then sleep on it, start again from the beginning, sleep on it again, and *then and only then* ask a focused, narrow question on [so]. — Jörg W Mittag, Sep 06 '17 at 12:01

score 0 · Answer 1 · answered Sep 06 '17 at 12:03

You can use the sort() function with two parameters that will loop through and get you the sorted JOSN array with respect to data key.

var arr = [
{
    "data": [
      8, 2, 3, 4, 5,6,7
    ]
  },
  {
    "data": [
       1, 2, 3
    ]
  },
  {
    "data": [
      2, 3, 4, 5
    ]
  },
  {
    "data": [
       4, 5
    ]
  }
];

arr.sort(function (first, second) {
    return first.data.length - second.data.length;
});

console.log(arr);

For better output i have added some extra objects in arr

Sorting an array based on parameter array length

1 Answers1