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.