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| author | Leah Neukirchen <leah@vuxu.org> | 2022-12-07 00:33:16 +0100 |
|---|---|---|
| committer | Leah Neukirchen <leah@vuxu.org> | 2022-12-07 00:33:44 +0100 |
| commit | 3119e2a2b550919326f7850242a6083c81a9b1fa (patch) | |
| tree | f51aab3495b5b70b1f8f61af616afe3fcff088ed | |
| parent | cb824d94d9d5a81acb498b6b9462a318ac4d23aa (diff) | |
| download | mew-3119e2a2b550919326f7850242a6083c81a9b1fa.tar.gz mew-3119e2a2b550919326f7850242a6083c81a9b1fa.tar.xz mew-3119e2a2b550919326f7850242a6083c81a9b1fa.zip | |
app: allow empty arguments
| -rw-r--r-- | mew.scm | 8 | ||||
| -rw-r--r-- | mew.svnwiki | 2 | ||||
| -rw-r--r-- | tests/test.mew | 6 |
3 files changed, 13 insertions, 3 deletions
diff --git a/mew.scm b/mew.scm index 5828f36..17c23d2 100644 --- a/mew.scm +++ b/mew.scm @@ -1,6 +1,6 @@ (module mew (export - act accumulate andloc at + act accumulate andloc app at boolean comp cross-product dec def del-at div @@ -97,7 +97,6 @@ assoc member) (lambda fun) - (apply app) (ceiling ceil) (truncate trunc) )) @@ -179,6 +178,11 @@ (display " ")) (loop (cdr args) (car args)))))) + (define (app f . args) + (if (null? args) + (f) + (apply apply f args))) + (define-syntax seq (syntax-rules () ((_) diff --git a/mew.svnwiki b/mew.svnwiki index c204dbb..5b0d4b0 100644 --- a/mew.svnwiki +++ b/mew.svnwiki @@ -157,7 +157,7 @@ Alias for {{floor-remainder}}. <procedure>(app <proc> . <args>)</procedure> -Alias for {{apply}}. +Like {{apply}}, but supports empty {{<args>}}. <syntax>(op <form>)</syntax> diff --git a/tests/test.mew b/tests/test.mew index 5587d90..32d9df1 100644 --- a/tests/test.mew +++ b/tests/test.mew @@ -141,6 +141,12 @@ (test "\n" (with-output-to-string (fun () (prn)))) (test 3 (esc ret (with-output-to-string (fun () (ret (prn 1 2 3))))))) +(test-group "app" + (test 15 (app + '(4 5 6))) + (test 15 (app + 4 5 '(6))) + (test 15 (app + 4 5 6 '())) + (test 0 (app +))) + (test-group "seq" (test #t (void? (seq))) (test 1 (seq 1)) |