Is there an easy way to make nested array flat?

Question

That is to make this:

[ [\'dog\',\'cat\', [\'chicken\', \'bear\'] ],[\'mouse\',\'horse\'] ]

into:

[\'dog\',\'cat\',\'chicken\',\'

Answer 1

Now in 2019 you can easily use Array.flat with whatever depth you want.

let arr  = [ ['dog','cat', ['chicken', 'bear'] ],['mouse','horse'] ]

let op = arr.flat(Infinity)

console.log(op)

Now if you want to get unique values you can combine both Set and flat

let arr  = [ ['dog','cat', ['chicken', 'bear', 'cat'] ],['mouse','horse', 'dog'], [[[['deeper','chicken']]]] ]

let unique  = [...new Set(arr.flat(Infinity))]

console.log(unique)

Browser comparability Except IE all other seems to support for IE you can use polyfill.