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| author | Hugo Hörnquist <hugo@lysator.liu.se> | 2023-02-23 02:18:57 +0100 |
|---|---|---|
| committer | Hugo Hörnquist <hugo@lysator.liu.se> | 2023-02-23 04:03:36 +0100 |
| commit | 5ab726d27c2a300fefbcc843ad01a7c04590ff15 (patch) | |
| tree | db9e7bc8e047fdc5242a9b7c55883c6892770963 /module/hnh/util.scm | |
| parent | Extend `for'-macro to allow improper list elements. (diff) | |
| download | calp-5ab726d27c2a300fefbcc843ad01a7c04590ff15.tar.gz calp-5ab726d27c2a300fefbcc843ad01a7c04590ff15.tar.xz | |
Change group-by to return direct pairs.
Each value in the return of group-by must have exactly two values, so
cons pairs (instead of lists) is much better.
Diffstat (limited to 'module/hnh/util.scm')
| -rw-r--r-- | module/hnh/util.scm | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/module/hnh/util.scm b/module/hnh/util.scm index 36b56c58..ba2a8a59 100644 --- a/module/hnh/util.scm +++ b/module/hnh/util.scm @@ -330,10 +330,7 @@ (for value in lst (let ((key (proc value))) (hash-set! h key (cons value (hash-ref h key '()))))) - ;; TODO change this 'list' to 'cons'. - ;; It will give a "proper" alist, and also allows the output to work - ;; with assq-merge - (hash-map->list list h))) + (hash-map->list cons h))) ;; (split-by '(0 1 2 3 4 2 5 6) 2) ;; ⇒ ((0 1) (3 4) (5 6)) |