www.delorie.com/gnu/docs/guile/guile_445.html

search

	Buy GNU books!

Guile Reference Manual

39.3.4 Length, Append, Concatenate, etc.

Scheme Procedure: length+ lst

Return the length of the argument list lst. When lst is a circular list, #f is returned.

Scheme Procedure: concatenate list-of-lists

Scheme Procedure: concatenate! list-of-lists

Construct a list by appending all lists in list-of-lists.

concatenate! may modify the structure of the given lists in order to produce the result.

Scheme Procedure: append-reverse rev-head tail

Scheme Procedure: append-reverse! rev-head tail

Reverse rev-head, append tail and return the result. This is equivalent to (append (reverse rev-head) tail), but more efficient.

append-reverse! may modify rev-head in order to produce the result.

Scheme Procedure: zip lst1 lst2 ...

Return a list as long as the shortest of the argument lists, where each element is a list. The first list contains the first elements of the argument lists, the second list contains the second elements, and so on.

Scheme Procedure: unzip1 lst

Scheme Procedure: unzip2 lst

Scheme Procedure: unzip3 lst

Scheme Procedure: unzip4 lst

Scheme Procedure: unzip5 lst

unzip1 takes a list of lists, and returns a list containing the first elements of each list, unzip2 returns two lists, the first containing the first elements of each lists and the second containing the second elements of each lists, and so on.