map
map
map {block} list
map expr, list
Evaluates the block or expr for each element of list (locally setting $_ to each element) and returns the list value composed of the results of each such evaluation. It evaluates block or expr in a list context, so each element of list may produce zero, one, or more elements in the returned value. These are all flattened into one list. For instance:

@words = map { split ' ' } @lines;
splits a list of lines into a list of words. Often, though, there is a one-to-one mapping between input values and output values:
@chars = map chr, @nums;
This statement translates a list of numbers to the corresponding characters.


@words = map {s/\s//g} @lines;