Issue #7300 has been updated by knu (Akinori MUSHA).
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Hash[enum.map {|x| x > 0 ? [x, x*x] : nil }]
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Hash[enum.map {|x| x > 0 ? [x, x*x] : nil }.compat] # minimum change
Hash[enum.flat_map {|x| x > 0 ? [x, x*x] : [] }] # 1.9+ only
{}.tap { |h| enum.each {|x| x > 0 and h[x] = x*x } }
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Bug #7300: Hash#[] ??®æ???????? 1.9.3 ??¨ç?°ã?ªã?£ã?¦ã?????
https://bugs.ruby-lang.org/issues/7300#change-32547
Author: hsbt (Hiroshi SHIBATA)
Status: Open
Priority: Normal
Assignee:
Category: core
Target version: 2.0.0
ruby -v: ruby 2.0.0dev (2012-11-07) [x86_64-darwin12.2.0]
Hash[[nil]] ???å®?è¡?????????? 1.9.3 ??§ã?? {} ??¨ã?ªã???????®ã?? 2.0.0 ??§ã?? ArgumentError ??¨ã?ªã????¾ã?????
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???????????¨ã??????????¦ã??????????¾ã???????????2.0.0 ??§ã?? dupricate ??®è¦???????????«ã????¦ã??
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