Javascript Map Array Last Item

Question

I have this:

map = ranks.map((row, r) => (
  row.map((rank, i) => {
    return [element(r, i, state, rank, toggled, onClick)];
  })
));

Answer 1

a shorter method would be to use .map combined with ternary operator, like this.

const positions = ["first", "second", "third", "fourth"]

positions.map((x, index, array) => {
    index === array.length -1 
        ? console.log("this is the last item in the array")
         : console.log( x)
}

//////////// explanation

x ### returns the current element .map is looping through

index ### returns the index(location of item in an array) of the current element.

array ### return the same element we are looping through so if we use sth like this

 ["first", "second", "third", "fourth"].map...

we'll still get the array we're looping through

array.length - 1 ### gives us the length of the array and - 1 gives us the index of the last element in the array

pls upvote if this helped, also comment if you need more explanation