1. An Intro to Perl, Pt. 2 Hashes, Foreach Control, and the Split Function

2. Hashes (Associative Arrays) Arrays with string indices Each index is called a key Different braces than arrays ({} not []) Use the % sigil to symbolize a hash

3. Example Hashes $numbers{“one”}=”1”; Assigns 1 to key “one” $numbers{“two”}=”2”; (accessed as a scalar) $numbers{“three”}=”3”; %numbers=(“one”,”1”,”two”,”2”,”three”,”3”); Creates hash with indices one, two, three and values of 1, 2, and 3

4. Hash Control while(($key, $value) = each %numbers){ print "$key $value\n”;} Prints out individual Key-value pairs for the hash

5. Foreach Control Statement For loop designed for processing arrays, hashes, and lists. @word=(“This”, “is”, “an”, “array”); foreach $word (@words){ print "$word\n";} @myNames = ('Larry', 'Curly', 'Moe'); foreach (@myNames) { print $_. “\n”;}

6. The Split Function Splits a string using a specific delimiter @fields=split " ", $string; If $string = “The quick brown fox” @fields= (“The”, “quick”, “brown”, “fox”) Default delimiter is a space “ “ $info = "Caine:Michael:Actor:14, Leafy Drive"; @personal = split(/:/, $info);