Merge multiple array in lodash

Question

I want to merge these array in to single array with unique value. don't want repeated values.

0:Array(2) ["General Fitness", "Health & Fitness"]
1:Array(2) ["Cardiovascular", "Meditation"]
2:Array(3) ["Health & Fitness", "Cardiovascular", "General Fitness"]
3:Array(1) ["Cardiovascular"]

I am expecting this answer:

["General Fitness", "Health & Fitness", "Cardiovascular", "Meditation"]

Possible duplicate of How to merge two array of object by using lodash? — Anshul Verma
– Anshul Verma, Commented Apr 4, 2018 at 13:10
_(data.hits.hits).map('_source.topics').compact().value() @ChrisR — Saad Ahmed
– Saad Ahmed, Commented Apr 4, 2018 at 13:11

Ori Drori · Accepted Answer · 2020-11-10 01:09:19Z

16

With lodash you can use _.union() and _.spread() to generate a function that flattens to a single array with unique values:

const fn = _.spread(_.union);

const arrs = [ 
  ["General Fitness", "Health & Fitness"],
  ["Cardiovascular", "Meditation"],
  ["Health & Fitness", "Cardiovascular", "General Fitness"],
  ["Cardiovascular"]
];

const result = fn(arrs);

console.log(result);

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js"></script>

Using ES6 you can flatten the arrays, and make the result unique by passing it through a Set, and spreading back to an array:

const arrs = [ 
  ["General Fitness", "Health & Fitness"],
  ["Cardiovascular", "Meditation"],
  ["Health & Fitness", "Cardiovascular", "General Fitness"],
  ["Cardiovascular"]
];

const result = [...new Set(arrs.flat())];

console.log(result);

edited Nov 10, 2020 at 1:09

answered Apr 4, 2018 at 13:12

Ori Drori

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Comments

iofjuupasli · Accepted Answer · 2018-04-04 13:16:55Z

10

const arrs = [ 
  ["General Fitness", "Health & Fitness"],
  ["Cardiovascular", "Meditation"],
  ["Health & Fitness", "Cardiovascular", "General Fitness"],
  ["Cardiovascular"]
];

const result = _.uniq(_.flatten(arrs));

console.log(result);

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js"></script>

answered Apr 4, 2018 at 13:16

iofjuupasli

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Comments

abhishek gupta · Accepted Answer · 2018-04-04 13:19:32Z

4

use union

var object =  ["General Fitness", "Health & Fitness"];
var other =  ["Cardiovascular", "Health & Fitness", "Meditation"]
 
_.union(object, other);

// ["General Fitness", "Health & Fitness", "Cardiovascular", "Meditation"]

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js"></script>

answered Apr 4, 2018 at 13:19

abhishek gupta

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Comments

Monty · Accepted Answer · 2023-04-01 13:06:05Z

0

Simply use lodash flatten method:

const arrs = [ 
  ["General Fitness", "Health & Fitness"],
  ["Cardiovascular", "Meditation"],
  ["Health & Fitness", "Cardiovascular", "General Fitness"],
  ["Cardiovascular"]
];

result = _.flatten(arrs);

console.log(result);

answered Apr 1, 2023 at 13:06

Monty

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