convert object into an array with the given order

Question

order = ['mercury', 'venus', 'earth', 'mars', 'jupiter', 'saturn', 'uranus', 'neptune', 'pluto'];

var scrambled = {
  pluto : 'pluto very far',
  mars: 'mars very near',
  saturn: 'saturn dnt care',
  jupiter: 'jupiter',
  uranus : 'uranus',
  earth: 'earth',
  mercury: 'mercury',
  venus: 'venus',
  neptune: 'neptune'
};

need to extract the object into an array with the given order,

I am looking for a solution which can solve this is max of 2 to 3 lines.

"how to get the array with a given order" The array already is in the right order, isn't it? You have it already. There is nothing to get :) order.map(x => scrambled[x]). — Felix Kling
– Felix Kling, Commented Sep 20, 2016 at 18:31

Pranav C Balan · Accepted Answer · 2016-09-20 18:41:04Z

3

There is no need of any external library use native JavaScript Array#map method.

// iterate over order array
var res = order.map(function(k) {
  // generate array element based 
  // on the order array element
  return scrambled[k];
});

// with ES6 arrow function

var res = order.map(k => scrambled[k]);

order = ['mercury', 'venus', 'earth', 'mars', 'jupiter', 'saturn', 'uranus', 'neptune', 'pluto'];

var scrambled = {
  pluto: 'pluto very far',
  mars: 'mars very near',
  saturn: 'saturn dnt care',
  jupiter: 'jupiter',
  uranus: 'uranus',
  earth: 'earth',
  mercury: 'mercury',
  venus: 'venus',
  neptune: 'neptune'
};

var res = order.map(function(k) {
  return scrambled[k];
});

console.log(res);

edited Sep 20, 2016 at 18:41

answered Sep 20, 2016 at 18:26

Pranav C Balan

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Comments

Ori Drori · Accepted Answer · 2016-09-21 04:30:10Z

1

You can use lodash's _.at():

var order = ['mercury', 'venus', 'earth', 'mars', 'jupiter', 'saturn', 'uranus', 'neptune', 'pluto'];

var scrambled = {
  pluto : 'pluto very far',
  mars: 'mars very near',
  saturn: 'saturn dnt care',
  jupiter: undefined,
  uranus : 'uranus',
  earth: 'earth',
  mercury: 'mercury',
  venus: 'venus',
  neptune: 'neptune'
};

var result = _.at(scrambled, order);

console.log('with undefineds', result);

var result = _.filter(_.at(scrambled, order), _.negate(_.isUndefined)); // filter out all undefined items

console.log('without undefineds', result);

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.16.1/lodash.min.js"></script>

edited Sep 21, 2016 at 4:30

answered Sep 20, 2016 at 19:25

Ori Drori

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2 Comments

patz Over a year ago

In cases where scrambled has missing fields that might show as undefined in the array. here is a soln to that var res = .remove(.at(scrambled, order), function(n){ return !_.isUndefined(n); });

Ori Drori Over a year ago

I prefer this - _.filter(_.at(scrambled, order), _.negate(_.isUndefined));. Added it to answer.

Redu · Accepted Answer · 2016-09-20 20:55:18Z

0

Pure JS this should do it

var order = ['mercury', 'venus', 'earth', 'mars', 'jupiter', 'saturn', 'uranus', 'neptune', 'pluto'],
scrambled = {
  pluto : 'pluto very far',
  mars: 'mars very near',
  saturn: 'saturn dnt care',
  jupiter: 'jupiter',
  uranus : 'uranus',
  earth: 'earth',
  mercury: 'mercury',
  venus: 'venus',
  neptune: 'neptune'
},
   sorted = order.map(k => scrambled[k]);
console.log(sorted);

answered Sep 20, 2016 at 20:55

Redu

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