Merge every two elements into 1 element in javascript array

Question

Suppose I have the following array in JavaScript:

var dataArray= [
    'name1\n' +
    '\n' +
    'name2\n' +
    'name3',
     ' \n' +
    'name4\n' +
    'name5\n' +
    '\n' +
    'name6\n' +
    'name7\n' +
    '\n' +
    'name8',
      'name9\n' +
    '\n' +
    'name10\n' +
    'name11',
  ' \n' +
    'name12\n' +
    'name13\n' +
    '\n' +
    'name14\n' +
    'name15',
'name16\n' +
    '\n' +
    'name17\n' +
    'name18',
 ' \n' +
    'name19\n' +
    'name20\n' +
    '\n' +
    'name21\n' +
    'name22\n' +
    '\n' +
    'name23',
  'name24\n' +
    '\n' +
    'name25\n' +
    'name26',
  ' \n' +
    'name27\n' +
    'name28\n' +
    '\n' +
    'name29\n' +
    'name30',
]

How can I write code to merge every two elements into one element? So that each pair, is only separated by 1 comma?

I'm looking to get the following output:

var dataArray= [
    'name1\n' +
    '\n' +
    'name2\n' +
    'name3'
     ' \n' +
    'name4\n' +
    'name5\n' +
    '\n' +
    'name6\n' +
    'name7\n' +
    '\n' +
    'name8',
      'name9\n' +
    '\n' +
    'name10\n' +
    'name11'
  ' \n' +
    'name12\n' +
    'name13\n' +
    '\n' +
    'name14\n' +
    'name15',
'name16\n' +
    '\n' +
    'name17\n' +
    'name18'
 ' \n' +
    'name19\n' +
    'name20\n' +
    '\n' +
    'name21\n' +
    'name22\n' +
    '\n' +
    'name23',
  'name24\n' +
    '\n' +
    'name25\n' +
    'name26',
  ' \n' +
    'name27\n' +
    'name28\n' +
    '\n' +
    'name29\n' +
    'name30',
]

I want it to be like the above, whereby every 2 elements are amalgamated.

Please show some code where you've attempted to solve the problem. Also, see: How to Ask. — Ed Lucas
– Ed Lucas, Commented Jul 26, 2020 at 23:25
Why are you using arrays at all? You just have one giant string in the array. — jfriend00
– jfriend00, Commented Jul 27, 2020 at 3:41
@hev1 - Well, the fact that it's that hard to see shows how poorly formatted it is. — jfriend00
– jfriend00, Commented Jul 29, 2020 at 23:02

Unmitigated · Accepted Answer · 2020-07-26 21:12:43Z

3

You can use Array.from, assuming that the length of the array is even.

const res = Array.from({length:dataArray.length/2}, (_,i)=>dataArray[2*i]+dataArray[2*i+1]);

var dataArray= [
    'name1\n' +
    '\n' +
    'name2\n' +
    'name3',
     ' \n' +
    'name4\n' +
    'name5\n' +
    '\n' +
    'name6\n' +
    'name7\n' +
    '\n' +
    'name8',
      'name9\n' +
    '\n' +
    'name10\n' +
    'name11',
  ' \n' +
    'name12\n' +
    'name13\n' +
    '\n' +
    'name14\n' +
    'name15',
'name16\n' +
    '\n' +
    'name17\n' +
    'name18',
 ' \n' +
    'name19\n' +
    'name20\n' +
    '\n' +
    'name21\n' +
    'name22\n' +
    '\n' +
    'name23',
  'name24\n' +
    '\n' +
    'name25\n' +
    'name26',
  ' \n' +
    'name27\n' +
    'name28\n' +
    '\n' +
    'name29\n' +
    'name30',
];
const res = Array.from({length:dataArray.length/2}, (_,i)=>dataArray[2*i]+dataArray[2*i+1]);
console.log(res);

answered Jul 26, 2020 at 21:12

Unmitigated

91.4k12 gold badges102 silver badges109 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Lucaso Over a year ago

Excellent! This is exactly what I was looking for.

Unmitigated Over a year ago

@Lucaso Glad to help.

Collectives™ on Stack Overflow

Merge every two elements into 1 element in javascript array

1 Answer 1

2 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related