How to understand Ruby's .each and .map

Question

I am having trouble understanding the differences between map and each, and where and when to use them.

I read \"What does map do?\" and \

Answer 1

In the first case, map:

 z = [1,2,3].map {|x| x + 1}

will take each element in the given array and perform the operation in the block and return a new array, so here it returns [2,3,4].

.each executes the block for each of the elements in the array, and it will not change anything in the array, so here it performs x + 1, but it doesn't store it anywhere, hence in the second case it just returns the array.

Now in the third example you posted, you are printing output in the block itself. Again, there is no change in the array itself.