Let ret: Number
If (someCondition) {
<a lot of expensive calculations>
ret = resultOfOperations
} else {
<a lot of other different expensive operations>
ret = resultOfOtherOperations
}
returnret
letret = if some_condition {
<a lot of expensive calculations>
result_of_operations
} else {
<a lot of other different expensive calculations>
result_of_other_operations
};
Now you don’t have to declare it inside the blocks.
To be honest I always disliked variable declaration without value assignment, so to me both options suck. :)
What about
Let ret: Number If (someCondition) { <a lot of expensive calculations> ret = resultOfOperations } else { <a lot of other different expensive operations> ret = resultOfOtherOperations } return retYou can’t declare ret inside the brackets
Rust would allow you to
let ret = if some_condition { <a lot of expensive calculations> result_of_operations } else { <a lot of other different expensive calculations> result_of_other_operations };Now you don’t have to declare it inside the blocks.
That’s… Disgusting
Similarly, Perl lets you say
my $ret = do { if (...) { ... } else { ... }};What about you declare (then it gets allocated in stack) it and pass it to a different context for assignment?
Well, I don’t know your use case well enough, but I guess you might have perfect reason for that behavior.
One thing that comes to my mind is the old Try in C#
bool parsedSuccessfully = int.TryParse("123", out int result);But I guess more popular approach would be to use Error as Values, right?
E.g. something like this
Outcome<Exception, Int> result = int.TotallyNewParse("123");