Feature #7432
closedExplicit way to define local variable in scope
Description
Imagine code such as this
def test_smth
result = nil
assert_nothing_raised { result = some_slow_calculation }
assert_equal expected_answer, result
end
Line result = nil
means nothing more than our intention to simply bind variable result
in scope of assertion block with outer local variable. In large methods it can be much heavier to find out this obscured intention.
It may be better to introduce a method (if it can be implemented) or a keyword which simply creates a local variable (probably with nil value just to mark its existence)
define_variable 'x' or (define_variable x if it's a keyword)
Updated by Anonymous almost 12 years ago
This should definitely not be a method, however I would welcome a 'local' keyword for this purpose.
Updated by mame (Yusuke Endoh) almost 12 years ago
- Status changed from Open to Assigned
- Assignee set to matz (Yukihiro Matsumoto)
- Priority changed from Normal to 3
- Target version set to 3.0
Assigning to matz, but don't hold your breath; matz has rejected such a explicit variable declaration syntax many times.
--
Yusuke Endoh mame@tsg.ne.jp
Updated by trans (Thomas Sawyer) almost 12 years ago
I have always been curious why there is no dynamic way to create local variables (other then eval).
Eg. x = 10 might be dynamically written:
local :x, 10
Since we can create just about anything else dynamically, it seems like stark omission.
Updated by matz (Yukihiro Matsumoto) almost 12 years ago
- Status changed from Assigned to Rejected
Since I am sick of 'var' and 'local' in other languages, I don't want to add explicit local variable declaration, that requires a new keyword. Introducing a new keyword may break existing programs.
@trans (Thomas Sawyer) Your idea would eliminate many chances to optimize.
Matz.
Updated by trans (Thomas Sawyer) almost 12 years ago
I see why then. Thanks.