Programmer Humor

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What the F# (whatthefsharp.com)

submitted 2 weeks ago by [email protected] to c/[email protected]

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A small collection of WTF code snippets sorted by language.

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[–] [email protected] 9 points 2 weeks ago (3 children)

The WTF in the C# example seems to be that people don't understand anonymous functions and closures?

[–] [email protected] 6 points 2 weeks ago (1 children)

Some of the examples seem to be more "unintuitive for newbies", but there are still some good ones in there

[–] [email protected] 1 points 17 hours ago

Yeah, just check the PHP section!

My favourite is

var_dump(true == 'bob') . PHP_EOL;   // bool(true)
var_dump('bob' == 0) . PHP_EOL;   // bool(true)
var_dump(true == 0) . PHP_EOL;   // bool(false)

[–] [email protected] 3 points 2 weeks ago (1 children)

Yeah. I didn't understand what they meant by the wtf there. Seemed to me someone wondered if the Action would have a localised version of i (making this stay lowercase on a phone was harder than it should be) or if it used the same i. So made a simple test for it.

Not really sure it's a wtf unless they expected a different result.

[–] [email protected] 2 points 2 weeks ago

I think the explanation they provide is a bit lacking as well. Defining an anonymous function doesn't "create a reference" to any variables it uses, it captures the scope in which it was defined and retains existing references.

[–] [email protected] 1 points 2 weeks ago* (last edited 2 weeks ago) (1 children)

Go had the same behavior until recently. Closures captures the variable from the for loop and it was a reference to the value.
They changed it because it's "common" in Go to loop over something and run a goroutine that uses the variable defined in the loop. Workaround was to either shadow the variable with itself before the loop, or to pass the value as an argument.
It's been a long time since I wrote c# so idk if the same is expected from the avg dev, but in Go it's really not explicit that the variable will be a reference instead of a plain value

[–] [email protected] 1 points 2 weeks ago

i is still a value type, that never changes. Which highlights another issue I have with the explanation as provided. Using the word "reference" in a confusing way. Anonymous methods capture their enclosing scope, so i simply remains in-scope for all calls to those functions, and all those functions share the same enclosing scope. It never changes from being a value type.