Question

41

Sort a dictionary by value in JavaScript

rated 0 times [ 42] [ 1] / answers: 1 / hits: 121246 / 10 Years ago, tue, august 26, 2014, 12:00:00

Here is my dictionary:

const dict = {

  x : 1,

  y : 6,

  z : 9,

  a : 5,

  b : 7,

  c : 11,

  d : 17,

  t : 3

};

I need a way to sort my dict dictionary from the least to the greatest or from the greatest to the least. Or even it would be fine I had an array with the sorted keys in it. But I do not know how to do such thing using javascript. I have done it before using python, like this:

import heapq

from operator import itemgetter



thirty_largest = heapq.nlargest(8, dict.iteritems(), key=itemgetter(1))

I have searched for it in Google and I found that arrays have sort() function but not dictionaries. So my question is: How can I sort the dictionary or get top 5 biggest values in sort order?

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ryderalfonsos

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answered 10 Years ago charisma · Accepted Answer

It may not be straight forward in JavaScript.

var dict = {

  x: 1,

  y: 6,

  z: 9,

  a: 5,

  b: 7,

  c: 11,

  d: 17,

  t: 3

};



// Create items array

var items = Object.keys(dict).map(function(key) {

  return [key, dict[key]];

});



// Sort the array based on the second element

items.sort(function(first, second) {

  return second[1] - first[1];

});



// Create a new array with only the first 5 items

console.log(items.slice(0, 5));

The first step, creating items array, is similar to Python's

items = map(lambda x: [x, var[x]], var.keys())

which can be conveniently written as

items = list(dict.items())

and the sorting step is similar to Python's sorting with cmp parameter

items.sort(cmp=lambda x, y: y[1] - x[1])

and the last step is similar to the Python's slicing operation.

print items[:5]

// [['d', 17], ['c', 11], ['z', 9], ['b', 7], ['y', 6]]