Convert 2D Array Into 1D Array

Question

I have this 2 dimensional array:

var list = [
    ['zone_1', 'zone_2'],
    ['zone_3']
]

I want to merge all elements in the sub-arrays into a single array:

var list = [
    'zone_1',
    'zone_2',
    'zone_3'
]

How can I do that in node.js? It is possible to do it without using a loop or map?

I don't want to use loop or map Why not? Handy language tools are there to be used. An easy single-depth flatmap can be done via const output = [].concat(...input.map(arr => arr)); — CertainPerformance
– CertainPerformance, Commented Apr 18, 2018 at 0:52
You can also find what you want at here. stackoverflow.com/questions/10865025/… — Tanaike
– Tanaike, Commented Apr 18, 2018 at 0:55

CRice · Accepted Answer · 2018-04-18 00:52:57Z

9

The array .concat method is variadic, and you can use the spread operator to pass each sub-array to it as a separate argument. This makes flattening an array turn into a nice one-liner:

const arr = [ ['zone_1', 'zone_2'], ['zone_3'] ];
console.log([].concat(...arr))

answered Apr 18, 2018 at 0:52

CRice

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1 Comment

Instasea Over a year ago

Thank you very much CRice. It works now. It is the one that I wanted.

sanjoyAudhikari · Accepted Answer · 2020-01-06 17:19:04Z

8

Array.prototype.flat() The flat() method creates a new array with all sub-array elements concatenated into it recursively up to the specified depth.

const arr = [ ['zone_1', 'zone_2'], ['zone_3'] ];
console.log(arr.flat());

answered Jan 6, 2020 at 17:19

sanjoyAudhikari

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