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Feature #12318
closedReturning the evaluated value of a block
Status:
Closed
Assignee:
-
Target version:
-
Description
I often achieve an element using an iterator with a block, and then apply the same/a similar block to the element I get. Examples are:
[7, 8, 9]
.max_by{|e| e % 3}
.tap{|e| break e % 3}
# => 2
["foo", "bar", "baz"]
.find{|e| e[/(.)\1/]}
.tap{|e| break e[/(.)\1/]}
# => "oo"
I would like a method on Enumerator
that returns the result of the block rather than the original element in the iterator. Not sure about the name, but if I call it and_return
temporary, it should look like:
[7, 8, 9]
.max_by.and_return{|e| e % 3}
# => 2
["foo", "bar", "baz"]
.find.and_return{|e| e[/(.)\1/]}
# => "oo"
Updated by nobu (Nobuyoshi Nakada) over 8 years ago
It doesn't seem generic enough to be defined in Enumerator
.
The receiver enumerator may return different object than its elements nor the results of the given block, whereas that and_return
has to manage the association of them.
Why not simpler:
[7, 8, 9].map {|e| e % 3}.max
# => 2
["foo", "bar", "baz"].find {|e| break e if e = e[/(.)\1/]}
# => "oo"
or
["foo", "bar", "baz"].grep(/(.)\1/) {break $&}
# => "oo"
Updated by avit (Andrew Vit) over 6 years ago
This is now implemented as yield_self
Close please?
Updated by shyouhei (Shyouhei Urabe) over 6 years ago
- Status changed from Open to Closed
avit (Andrew Vit) wrote:
This is now implemented as
yield_self
Close please?
Yes. Closing.
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