Control Structures

Foreach

• The foreach statement takes a list of values and iterates through them one at a time by the use of a specified scalar variable.
• The scalar variable used is local to the loop, and when the loop is complete it will return to it's pre-loop value.
• Example:
  

  # Print 0 through 9 in order.
  @theArray = (2,4,3,1,5,7,8,6,9,0);
  foreach $theVar (sort(@theArray))
  {
      print "$theVar\n";
  }
  

• If the list you are iterating over are real live variables, and not the results of some function call, then the loop scalar is actually an alias for each variable in the list, and any changes to the loop scalar will be reflected as changes to the list variables.
• Example:
  

  @theArray = (0,1,2,3,4,5,6,7,8,9);
  foreach $theVar (@theArray) 
  {
      $theVar *= 10; 
  }
  print "@theArray\n"; 
  ===> 0 10 20 30 40 50 60 70 80 90