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Arrays
The lists on the previous page weren't very useful - we need some way of saving entire lists for later use and modification.An array is a named list. As with lists, its space is dynamically allocated and removed, it is 0-indexed, and shares all the operators, and some new accessors
- @ (at sign)
- Refers to the entire array or slice of an array (when used in conjuction with [ ]).
- $ (dollar sign)
- Refers to one element of the array, used in conjunction with [ ]
@stringInstruments = ("violin","viola","cello","bass");
@brass = ("trumpet","horn","trombone","euphonium","tuba");
$biggestInstrument = $stringInstruments[3];
print("orchestral brass: ",
join(" ",@brass[0,1,2,4] ),
"\n");
| Some Array functions | |
|---|---|
| in addtion to list functions | |
| push(@ARRAY,LIST) | add LIST to the end of @ARRAY |
| pop(@ARRAY) | remove and return the last element of @ARRAY |
| unshift(@ARRAY,LIST) | add LIST to the front of @ARRAY |
| shift(@ARRAY) | remove and return the first element of @ARRAY |
| scalar(@ARRAY) | return the number of elements in the array |
The National Center for Supercomputing Applications
University of Illinois at Urbana-Champaign
johnsonb@ncsa.uiuc.edu
Last modified: June 19, 1997