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Feature #12995
closedConditional expression taking a receiver outside the condition
Status:
Rejected
Assignee:
-
Target version:
-
Description
Since a conditional expression has a return value, we can continue a method chain after a conditional expression like this:
if hoge
foo1.foo2.foo3
else
bar1.bar2
end
.baz1.baz2.baz3.baz4
case hoge
when hoge1
foo1.foo2.foo3
when hoge2
bar1.bar2
end
.baz1.baz2.baz3.baz4
It is convenient if we can have a condition after or in the middle of a chain. I would like to do this:
baz1.baz2.baz3.baz4.
if hoge
foo1.foo2.foo3
else
bar1.bar2
end
baz1.baz2.baz3.baz4
if hoge
.foo1.foo2.foo3
else
.bar1.bar2
end
baz1.baz2.baz3.baz4.
case hoge
when hoge1
foo1.foo2.foo3
when hoge2
bar1.bar2
end
baz1.baz2.baz3.baz4
case hoge
when hoge1
.foo1.foo2.foo3
when hoge2
.bar1.bar2
end
Updated by herwinw (Herwin Quarantainenet) almost 8 years ago
You can do that with #tap. A very stupid example:
array = [true]
res = array.to_a.tap do |obj|
if obj[0]
obj.replace([['true', :val]])
else
obj.replace([['false', :val]])
end
end.to_a.to_h
p res
Results in:
{"true"=>:val}
Updated by matz (Yukihiro Matsumoto) over 7 years ago
- Status changed from Open to Rejected
Interesting proposal but this changes the meaning of if
and case
too much.
Matz.
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