Sort a dictionary by value in JavaScript

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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]]

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