1. Perl Chapter 4
Arrays

2. foreach loop Iterative statement to process array elements
control based on number of elements in array or list literal
foreach [scalar_var] (list_literal or array_name) { … }
[scalar_var] optional $_ used
[scalar_var] local to the loop

3. examples
foreach $age { $age++; } #age is now undef $sum=0; foreach $index (0..99){ $sum += $list[$index];

4. list operators reverse - @rnames = reverse @names;
sort @sorted_names =
list of numbers sorted as STRINGS
Chapter 6 talks more about sorting

5. split function opposite of join
takes strings apart – assigned to array often
split /pattern/, expression, limit
where /pattern/ is a regular expression

6. split /pattern/, expression, limit /:/ “lsk:jfkd:skld:”
absent is whitespace $stringVar
// $_
splits into individual characters
@chars=split //, “kumquats”;  “k”, “u”, “m”, “q”, “u”, “a”, “t”, “s”

7. limit specifies max number of substrings to produce
$line=<STDIN>; type in Bobby Sue Jones
($fname, $mname, $lname)= split / /, $line; or
($fname, $mname, $lname) = split $line;
limit specifies max number of substrings to produce
@fruit=split /,/, apples,grapes,pineapples,bananas”, 3;
results in
@fruit  (“apples”, “grapes”, “pineapples,bananas”)
/pattern/ can get quite complex  Chapter 7