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sequence-length: special-case lists too.

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This commit is contained in:
Vincent St-Amour 2016-01-03 12:57:21 -06:00
parent a2c9b47552
commit 1e18a7e2b4
1 changed files with 2 additions and 1 deletions
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3
racket/collects/racket/sequence.rkt
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@ -41,7 +41,8 @@
(define (sequence-length s)
(unless (sequence? s) (raise-argument-error 'sequence-length "sequence?" s))
(cond [(vector? s) (vector-length s)]
(cond [(list? s) (length s)]
[(vector? s) (vector-length s)]
[(hash? s) (hash-count s)]
[else
(for/fold ([c 0]) ([i (in-values*-sequence s)])