Difference between revisions of "S2 Cookbook: Arrays"
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== Get a random array item == | == Get a random array item == | ||
| − | Use the <code>rand</code> function to get | + | Use the <code>rand</code> function to get an index within the array's range: |
<syntaxhighlight lang="s2"> | <syntaxhighlight lang="s2"> | ||
var string[] items = ["sock", "pants", "shirt", "skirt", "scarf"]; | var string[] items = ["sock", "pants", "shirt", "skirt", "scarf"]; | ||
| − | |||
# goes from 0 to size-1 in indexing | # goes from 0 to size-1 in indexing | ||
| − | var int random = rand( size $items | + | var int random = rand(0, size $items - 1 ); |
var string pick = $items[$random]; | var string pick = $items[$random]; | ||
print "Pick: $pick (item $random)"; | print "Pick: $pick (item $random)"; | ||
</syntaxhighlight> | </syntaxhighlight> | ||
| + | |||
| + | You can even do it entirely inline: | ||
| + | |||
| + | <syntaxhighlight lang="s2"> | ||
| + | var string pick = $items[rand(0, size $items - 1 )]; | ||
| + | <syntaxhighlight> | ||
== Reverse an array == | == Reverse an array == | ||
Revision as of 19:03, 10 August 2010
Contents
Access an item of an array or associative array
var string[] items = ["sock", "pants", "shirt", "skirt", "scarf"]; var string{} fruits = {"apple" => "red", "lemon" => "yellow", "grape" => "purple"}; ## Accessing an array # sock print $items[0]; # pants print $items[1]; ## Accessing an associative array # red print $fruits{"apple"}; # yellow print $fruits{"lemon"}; # purple print $fruits{"grape"};
Cycle through all the items of an array or associative array
Please see the recipes:
Get the number of items in an array or associative array
Use the size keyword:
var string[] items = ["sock", "pants", "shirt", "skirt", "scarf"]; var int items_length = size $items; var string{} fruits = {"apple" => "red", "lemon" => "yellow", "grape" => "purple"}; var int fruits_length = size $fruits; # Items: 5; Fruits: 3 print "Items: $items_length; Fruits: $fruits_length";
Get the last item of an array
When you use a negative number as the index to an array, the count starts from the end of the array:
var string[] items = ["sock", "pants", "shirt", "skirt", "scarf"]; # scarf print $items[-1]; # skirt print $items[-2];
Get a random array item
Use the rand function to get an index within the array's range:
var string[] items = ["sock", "pants", "shirt", "skirt", "scarf"]; # goes from 0 to size-1 in indexing var int random = rand(0, size $items - 1 ); var string pick = $items[$random]; print "Pick: $pick (item $random)";
You can even do it entirely inline:
var string pick = $items[rand(0, size $items - 1 )]; <syntaxhighlight> == Reverse an array == Use the <code>reverse</code> keyword to reverse an array: <syntaxhighlight lang="s2"> var string[] items = ["sock", "pants", "shirt", "skirt", "scarf"]; # scarf, skirt, shirt, pants, sock, foreach var string item ( reverse $items ) { print "$item, "; }
