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Diffstat (limited to 'txr.1')
| -rw-r--r-- | txr.1 | 45 |
1 files changed, 45 insertions, 0 deletions
@@ -21477,6 +21477,51 @@ arguments: -> ((1 1) (4 4)) .cble +.coNP Function @ mapf +.synb +.mets (mapf < main-function << arg-function *) +.syne +.desc +The +.code mapf +function returns a function which distributes its arguments +into the +.metn arg-function -s. +That is to say, each successive argument of the returned +function is associated with a successive +.metn arg-function . + +Each +.metn arg-function +is called, passed the corresponding argument. The return +values of these functions are then passd as arguments +to +.meta main function +and the resulting value is returned. + +If the returned function is calle with fewer arguments than there +are +.metn arg-function -s, +then only that many functions are used. Conversely, if the function is +called with more arguments than there are +.metn arg-function -s, then those arguments are ignored. + +The following equivalence holds: + +.cblk + (mapf fm f0 f1 ...) <--> (lambda (. rest) + [apply fm [mapcar call (list f0 f1 ...) rest]]) +.cble + +.TP* Example: + +.cblk + ;; Keep those pairs which are two of a kind + + (keep-if [callf eql first second] '((1 1) (2 3) (4 4) (5 6))) + -> ((1 1) (4 4)) +.cble + .SS* Input and Output (Streams) \*(TL supports input and output streams of various kinds, with generic operations that work across the stream types. |