I have the following array of arrays:
const myArray = [ ['1', 'first'], ['2', 'second'], ['3', 'third'], ['4', 'fourth'] ]
I want to return an array like:
[ 'first', 'second', 'third', 'fourth' ]
I'm trying the following filter:
const res = myArray.filter( elm => elm[1] )
but it doesn't return the desired filter, just return the same...
.filter() is used to create a subset of an array containing elements that pass a certain requirements test.
.map() is used create a new array consisting of the results of passing the elements through a function.
The following should work as you intend:
const res = myArray.map(elm => elm[1]);