Concat array into one array (JS or Lodash)

Question

Input:

var array1 = ["12346","12347\n12348","12349"];

Steps:

Replace \n with ',' and Add into list.

Output:

var array2 = ["12346","12347","12348","12349"];

I tried below logic but not reach to output. Looks like something is missing.

var array2 = [];

_.forEach(array1, function (item) {               
       var splitData = _.replace(item, /\s+/g, ',').split(',').join();
       array2.push(splitData);
});

Output of my code:

["12346","12347,12348","12349"]

Nina Scholz · Answer 1 · 2017-02-22T12:35:04.253

10

You could join it with newline '\n' and split it by newline for the result.

var array= ["12346", "12347\n12348", "12349"],
    result = array.join('\n').split('\n');

console.log(result);

edited Feb 22 '17 at 12:35

answered Feb 22 '17 at 12:27

Nina Scholz

376,160
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great idea best use :) – Álvaro Touzón Feb 22 '17 at 12:30
Superb... Solution is working for me... Thanks a lot. – Anand Somani Feb 22 '17 at 12:30
Can we avoid duplicates? if input having some duplicates like `var array= ["12346", "12347\n12348", "12349", "12348" ]` – Anand Somani Feb 22 '17 at 13:45
then you need some method like `array = [...(new Set(array))]`, or an equivalent in ES5 – Nina Scholz Feb 22 '17 at 13:52
@AnandSomani You can refer following post to remove duplicates: http://stackoverflow.com/questions/9229645/remove-duplicates-from-javascript-array – Rajesh Feb 22 '17 at 14:16
Found answer : `_.uniqWith(array.join().replace(/\n/g, ',').split(','),_.isEqual);` – Anand Somani Feb 22 '17 at 15:19
An interesting and helpful approach. Have another Nice Answer badge. – ouflak Mar 14 '17 at 14:29

ntalbs · Answer 2 · 2017-02-22T12:49:33.317

3

If you're using lodash, applying flatmap would be the simplest way:

var array1 = ["12346", "12347\n12348", "12349"];
var array2 = _.flatMap(array1, (e) => e.split('\n'));

console.log(array2);
//=> ["12346", "12347", "12348", "12349"]

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.4/lodash.min.js"></script>

edited Feb 22 '17 at 12:49

answered Feb 22 '17 at 12:39

ntalbs

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score 1 · Answer 3 · answered Feb 22 '17 at 12:38

An alternate to @Nina's answer would be to use Array.push.apply with string.split(/\n/)

var array= ["12346","12347\n12348","12349"];
var result = []

array.forEach(function(item){
   result.push.apply(result, item.split(/\n/))
})

console.log(result);

Concat array into one array (JS or Lodash)

3 Answers3

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