variable names
scalar values
- $days # the simple scalar value "days"
- $days[28] # the 29th element of array @days
- $days{'Feb'} # the 'Feb' value from hash %days
- $#days # the last index of array @days
entire arrays or array slices (aka lists)
- @days # ($days[0], $days[1],... $days[n])
- @days[3,4,5] # same as @days[3..5]
- @days{'a','c'} # same as ($days{'a'},$days{'c'})
entire hashes
- %days # (key1, val1, key2, val2 ...)