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NEWS: add an example for Lazy#eager

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This commit is contained in:
Yusuke Endoh 2019-10-22 19:39:42 +09:00
parent 0e735b218f
commit fac4339a12
1 changed files with 9 additions and 0 deletions
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NEWS
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@ -251,6 +251,15 @@ Enumerator::
* Added Enumerator::Lazy#eager that generates a non-lazy enumerator * Added Enumerator::Lazy#eager that generates a non-lazy enumerator
from a lazy enumerator. [Feature #15901] from a lazy enumerator. [Feature #15901]
a = %w(foo bar baz)
e = a.lazy
.map {|x| p [x, :upcase]; x.upcase }
.map {|x| p [x, :add_bang]; x + "!" }
.eager
p e.next #=> ["foo", :upcase], ["FOO", :add_bang], "FOO!"
p e.next #=> ["bar", :upcase], ["BAR", :add_bang], "BAR!"
p e.next #=> ["baz", :upcase], ["BAZ", :add_bang], "BAZ!"
* Added Enumerator::Yielder#to_proc so that a Yielder object * Added Enumerator::Yielder#to_proc so that a Yielder object
can be directly passed to another method as a block can be directly passed to another method as a block
argument. [Feature #15618] argument. [Feature #15618]