javascript array merge based on indexes

Question

I have one array, needs to merge with values the same indexes values like 0 will become ['0','0','1','2']

Example:

0:
    0: (2) ['0', '0']
    1: (2) ['0', '0']
    2: (2) ['0', '2']
1:  
    0: ['1']
    1: ['2']
    2: ['2']
2:  
    0: ['2']
    1: ['2']
    2: ['2']

Tried

var result = outterArray.reduce(function (a, b) {
        return a.map(function (v, i) {
            return [v] + b[i];
        });
      });

but getting

0: "0,012"
1: "0,022"
2: "0,222"

expected :

0: "[0,0,1,2]"
1: "[0,0,2,2]"
2: "[0,2,2,2]"

Please be a little more detailed: what is input here, and what is output? Also, what code did you already write and isn't doing what you expected it to? If it's been a while, please remember to reread how to ask a good question and then update your post accordingly. — Mike 'Pomax' Kamermans
– Mike 'Pomax' Kamermans, Commented Jul 20, 2022 at 16:50
Is the original data always a square? (same number of rows as columns) If not, is is always rectangular (same number of columns in each row) — Samathingamajig
– Samathingamajig, Commented Jul 20, 2022 at 16:52

Nina Scholz · Accepted Answer · 2022-07-20 17:07:46Z

3

Assuming the below array, you could map the inner array and take the values from the accumulator at same index or an empty array.

const 
    data= [
        [['0', '0'], ['0', '0'], ['0', '2']],
        [['1'], ['2'], ['2']],
        [['2'], ['2'], ['2']]
    ],
    result = data.reduce((r, a) => a.map((v, i) => [...(r[i] || []), ...v]), []);

console.log(result);

.as-console-wrapper { max-height: 100% !important; top: 0; }

answered Jul 20, 2022 at 17:07

Nina Scholz

388k26 gold badges367 silver badges417 bronze badges

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

Collectives™ on Stack Overflow

javascript array merge based on indexes

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related