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15 lines
368 B
Plaintext
15 lines
368 B
Plaintext
11 years ago
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#lang scribble/manual
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@(require scribble/eval (for-label racket sugar))
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@(define my-eval (make-base-eval))
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@(my-eval `(require sugar))
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@title{Len}
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@defmodule[sugar/len]
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@defproc[
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(len
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[x (or/c list? string? symbol? vector? hash? integer? set?)])
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integer?]
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Convert @racket[_x] to a length in the least surprising way possible, or raise an error if it can't be done.
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