convert two dimentional array

Asked Jun 05 '19 at 06:55

Active Jun 05 '19 at 07:29

Viewed 43 times

I have a 2 dimensional array:

const keys = [
    ['a'],
    ['one', 'two', 'three'],
    ['X', 'Y']
]

And I want to convert it to this format:

const output = [
    ['a', 'one', 'X'],
    ['a', 'one', 'Y'],        
    ['a', 'two', 'X'],
    ['a', 'two', 'Y'],         
    ['a', 'three', 'X'],
    ['a', 'three', 'Y']
]

The order of the output array is of importance. I have tried several approaches (recursive functions, a function that determines the fill length of the output and then fills in each position, etc.) but none of them seem to work...

Any help (code or concepts) would be much appreciated as this seemingly simple problem is giving me an headache.

edited Jun 05 '19 at 07:29

asked Jun 05 '19 at 06:55

JasperZelf

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1

You want all combinations of each sub-array? – VLAZ Jun 05 '19 at 06:57
Yep... in the right order. So pretty much as we would be counting. However, in this case not all digits can count up to the same amount (if that makes any sense) – JasperZelf Jun 05 '19 at 07:03
1

var data = [['a'], ['one', 'two', 'three'], ['X', 'Y']], result = data.reduce((a, b) => a.reduce((r, v) => r.concat(b.map(w => [].concat(v, w))), [])); console.log(result); . u will get your answer. – Krunal Shah Jun 05 '19 at 07:07
@adiga Thanks... did not know it was called "Cartesian product". – JasperZelf Jun 05 '19 at 07:08
@Krunal Shah thnx. works – JasperZelf Jun 05 '19 at 07:10
1

@KrunalShah, the answer could be from me ... ;-) – Nina Scholz Jun 05 '19 at 07:12
yes ;) @NinaScholz – Krunal Shah Jun 05 '19 at 07:15

convert two dimentional array

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