Nasal scripting language: Difference between revisions

Nasal scripting language (view source)

1,238 bytes removed , 17 August 2012

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 '''''More information can be found at [[Namespaces and Methods]].'''''
-== Variables - Advanced Uses ==
-Nasal, also supports Multi-assignment expressions. You can assign more than one variable (or lvalue) at a time by putting them in a parenthesized list:
-<syntaxhighlight lang="php">
-   (var a, var b) = (1, 2);
-   var (a, b) = (1, 2);               # Shorthand for (var a, var b)
-   (var a, v[0], obj.field) = (1,2,3) # Any assignable lvalue works
-   var color = [1, 1, 0.5];
-   var (r, g, b) = color;  # works with runtime vectors too
-</syntaxhighlight>
-Vectors (lists or arrays) can be created from others using an ordered list of indexes and ranges.
-This is usually called "vector slicing".
-For example:
-<syntaxhighlight lang="php">
-   var v1 = ["a","b","c","d","e"]
-   var v2 = v1[3,2];   # == ["d","c"];
-   var v3 = v1[1:3];   # i.e. range from 1 to 3: ["b","c","d"];
-   var v4 = v1[1:];    # no value means "to the end": ["b","c","d","e"]
-   var i = 2;
-   var v5 = v1[i];     # runtime expressions are fine: ["c"]
-   var v6 = v1[-2,-1]; # negative indexes are relative to end: ["d","e"]
-</syntaxhighlight>
-The range values can be computed at runtime (e.g. i=1; v5=v1[i:]). Negative indices work the same way they do with the vector functions (-1 is the last element, -2 is 2nd to last, etc...).
 == Storage: property tree vs. Nasal ==