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Add Enumerable#filter_map since Ruby 2.7 #2264

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Jun 2, 2020
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Add Enumerable#filter_map since Ruby 2.7 #2264

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17 changes: 17 additions & 0 deletions refm/api/src/_builtin/Enumerable
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Original file line number Diff line number Diff line change
Expand Up @@ -179,6 +179,23 @@ end
@see [[m:Enumerable#reject]]
@see [[m:Enumerable#grep]]

#@since 2.7.0
--- filter_map {|item| ... } -> [object]
--- filter_map -> Enumerator

各要素に対してブロックを評価した値のうち、真であった値の
配列を返します。

ブロックを省略した場合は、各要素に対してブロックを評価した値のうち、
真であった値の配列を返すような [[c:Enumerator]] を返します。

#@samplecode 例
(1..10).filter_map { |i| i * 2 if i.even? } #=> [4, 8, 12, 16, 20]
#@end

@see [[m:Enumerable#filter]], [[m:Enumerable#map]]
#@end

--- grep(pattern) -> [object]
--- grep(pattern) {|item| ... } -> [object]

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