diff options
Diffstat (limited to 'txr.1')
| -rw-r--r-- | txr.1 | 51 |
1 files changed, 51 insertions, 0 deletions
@@ -7160,6 +7160,9 @@ case, nil otherwise. Non-empty lists test positive under consp because a list is represented as a reference to the first cons in a chain of one or more conses. +Note that a lazy cons is a cons and satisfies the consp test. See the function +make-lazy-cons. + .TP Examples: @@ -8172,6 +8175,41 @@ Examples: (zip '(a b c) '(c d e)) -> ((a c) (b d) (c e)) +.SS Function interpose + +.TP +Syntax: + + (interpose <sep> <sequence>) + +.TP +Description: + +The interpose function returns a sequence of the same type as <sequence>, +in which the elements from <sequence> appear with the <sep> value inserted +between them. + +If <sequence> is an empty sequence or a sequence of length 1, then a +sequence identical to <sequence> is returned. It may be a copy of <sequence> +or it may be <sequence> itself. + +If <sequence> is a character string, then the value <sep> must be a character. + +It is permissible for <sequence>, or for a suffix of <sequence> to be a lazy +list, in which case interpose returns a lazy list, or a list with a lazy +suffix. + +.SS +Examples: + + (interpose #\e- "xyz") -> "x-y-z" + (interpose t nil) -> nil + (interpose t #()) -> #() + (interpose #\ea "") -> "" + (interpose t (range 0 0)) -> (0) + (interpose t (range 0 1)) -> (0 t 1) + (interpose t (range 0 2)) -> (0 t 1 t 2) + .SS Functions conses and conses* .TP @@ -8736,6 +8774,19 @@ Example: (rplacd lcons (make-lazy-cons (lcons-fun lcons)))))))))) +.SS Function lconsp + +.TP +Syntax: + + (lconsp <value>) + +.TP +Description: + +The lconsp function returns t if <value> is a lazy cons cell. Otherwise +it returns nil, even if <value> is an ordinary cons cell. + .SS Function lcons-fun .TP |