stdlib: Implement last() and nth() functions.

[goals.git] / docs / Goalfile.pod

diff --git a/docs/Goalfile.pod b/docs/Goalfile.pod
index 46fbe1d..f586ec4 100644 (file)
--- a/docs/Goalfile.pod
+++ b/docs/Goalfile.pod
@@ -30,6 +30,14 @@ For example:
 
 Returns the directory part of the path.
 
 
 Returns the directory part of the path.
 

+=head3 error (msg)
+
+For example:
+
+ error ("this should not happen")
+
+This prints the error message and causes goals to exit.
+

 =head3 extension (filename)
 
 For example:
 =head3 extension (filename)
 
 For example:


@@ -38,6 +46,24 @@ For example:
 
 Returns the filename extension.
 
 
 Returns the filename extension.
 

+=head3 filter (pattern, list)
+
+For example:
+
+ filter ("a+", ["a", "b", "ca"]) ⇒ ["a", "ca"]
+
+Filter a list returning only the elements that match the extended
+regular expression C<pattern>.
+
+=head3 filter-out (pattern, list)
+
+For example:
+
+ filter-out ("a+", ["a", "b", "ca"]) ⇒ ["b"]
+
+Filter a list returning only the elements that I<do not> match the
+extended regular expression C<pattern>.
+

 =head3 head (list)
 
 For example:
 =head3 head (list)
 
 For example:


@@ -56,6 +82,22 @@ Concatenate C<list1> and C<list2>.  It's not usually necessary to use
 this function since goals automatically flattens lists within lists
 into simple lists in many cases.
 
 this function since goals automatically flattens lists within lists
 into simple lists in many cases.
 

+=head3 last (list)
+
+For example:
+
+ last (["a", "b", "c"]) ⇒ "c"
+
+Returns the last element of a list.
+
+=head3 nth (n, list)
+
+For example:
+
+ nth (1, ["a", "b", "c"]) ⇒ "b"
+
+Returns the n’th element of a list (counting from 0).
+

 =head3 read (filename)
 
 For example:
 =head3 read (filename)
 
 For example: