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Lists
Perl's power is assisted by it's builtin data types and the builtins that deal with them. Lists move us up the ladder of complexity from scalars.A list is an ordered collection of scalars. Space for lists are dynamically allocated and removed from the program's memory. Each element can be addressed by its integer position in the list. Lists are 0-indexed; the first element is called "0". Typical operators include
- ( ) (parenthesis)
- The list constructor.
- , (comma)
- The comma is used to separate elements of the list.
- [ ] (brackets)
- Brackets are used to take slices of the list.
$biggestInstrument = ("violin","viola","cello","bass")[3];
print("orchestral brass: ",
join(" ",("trumpet","horn","trombone","euphonium","tuba")[0,1,2,4]),
"\n");
| Some list functions | |
|---|---|
| sort(LIST) | return a new list, the sorted from LIST |
| reverse(LIST) | return a new list, the reverse of LIST |
| join(EXPR,LIST) | return a string formed by concatenating each element of LIST joined by EXPR |
| split(PATTERN,EXPR) | return a list formed from each substring of EXPR bordered by PATTERN. |
The National Center for Supercomputing Applications
University of Illinois at Urbana-Champaign
johnsonb@ncsa.uiuc.edu
Last modified: June 19, 1997