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rdoc update.

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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@26892 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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akr 2010-03-12 14:00:49 +00:00
parent 1eca24b1a5
commit 73fc3b5a34
1 changed files with 11 additions and 8 deletions
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19
enum.c
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@ -2418,15 +2418,18 @@ slicebefore_i(VALUE yielder, VALUE enumerator, int argc, VALUE *argv)
* *
* If the block needs to maintain state over multiple elements, * If the block needs to maintain state over multiple elements,
* local variables can be used. * local variables can be used.
* For example, monotonically increasing elements can be chunked as follows. * For example, three or more consecutive increasing numbers can be squashed
* as follows:
* *
* a = [3,1,4,1,5,9,2,6,5,3,5] * a = [0,2,3,4,6,7,9]
* n = 0 * prev = a[0]
* p a.slice_before {|elt| * p a.slice_before {|e|
* prev, n = n, elt * prev, prev2 = e, prev
* prev > elt * prev2 + 1 != e
* }.to_a * }.map {|es|
* #=> [[3], [1, 4], [1, 5, 9], [2, 6], [5], [3, 5]] * es.length <= 2 ? es.join(",") : "#{es.first}-#{es.last}"
* }.join(",")
* #=> "0,2-4,6,7,9"
* *
* However local variables are not appropriate to maintain state * However local variables are not appropriate to maintain state
* if the result enumerator is used twice or more. * if the result enumerator is used twice or more.