diff options
Diffstat (limited to 'txr.1')
| -rw-r--r-- | txr.1 | 42 |
1 files changed, 42 insertions, 0 deletions
@@ -8034,6 +8034,48 @@ returned which contains those elements of <object> whose keys appear in <index-list>. All of <index-list> is processed, even if it contains keys which are not in <object>. +.SS Funtion partition + +.TP +Syntax: + + (partition <sequence> {<index-list> | <index> | <function>}) + +.TP +Description: + +If <sequence> is empty, then partition returns an empty list, and the +second argument is ignored; if it is <function>, it is not called. + +Otherwise, partition-by returns a lazy list of partitions of the sequence +<sequence>. Partitions are consecutive, non-empty sub-strings of <sequence>, +of the same kind as <sequence>. + +If the second argument is of the form <index-list>, it is a sequence of +strictly increasing, positive integers. First, any leading zeros in this sequence +are dropped. The partition function then divides <sequence> according to the +indices in index list. The first partition begins with the first element of +<sequence>. The second partition begins at the first position in <index-list>, +and so on. Indices beyond the length of the sequence are ignored. + +If <index-list> is empty then a one-element list containing the entire +<sequence> is returned. + +If the second argument is a function, then this function is applied +to <sequence>, and the return value of this call is then used in place of the +second argument, which must be an <index> or <index-list>. + +If the second argument is an atom other than a function, it is assumed to be +an integer index, and is turned into an <index-list> of one element. + +.TP +Examples: + + (partition '(1 2 3) 1) -> ((1) (2 3)) + + ;; split the string where there is a "b" + (partition "abcbcbd" (op where @1 (op eql #\eb))) -> ("a" "bc" "bc" "bd") + .SS Function tree-find .TP |