C#•3y ago

✅ Default operator

Can somebody give me ELI5 explanation for the necessity of the

default

default

operator? I'm under the impression everything that's declared but not initialized is automatically given a default value, typically

null

null

depending on the type. When would something not get an implicit default value? (Assuming that's why the

default

default

operator exists)

Sswilli Can somebody give me ELI5 explanation for the necessity of the `default` operato...

Aaron•1/21/23, 2:45 AM

locals are never given a value implicitly

MODiX•1/21/23, 2:45 AM

Windows10CE#8553

REPL Result: Failure

Exception: CompilationErrorException

Compile: 507.910ms | Execution: 0.000ms | React with ❌ to remove this embed.

Aaron•1/21/23, 2:46 AM

you can use to say you want the default value

Aaron•1/21/23, 2:46 AM

which might matter if you have say, a generic method, because you won't know what the default is ahead of time

MODiX•1/21/23, 2:48 AM

Windows10CE#8553

REPL Result: Success

Result: int

Compile: 459.078ms | Execution: 33.766ms | React with ❌ to remove this embed.

AAaron which might matter if you have say, a generic method, because you won't know wha...

swilliOP•1/21/23, 4:05 AM

So for locals that makes sense, but I was under the impression fields always got a default value. I'm seeing this in the language extension library though:

swilliOP•1/21/23, 4:06 AM

wouldn't bottom always get a default value upon instantiation? Regardless of whether

was a class, struct, or primitive type?

Sswilli wouldn't bottom always get a default value upon instantiation? Regardless of whe...

Aaron•1/21/23, 5:37 AM

yes

Aaron•1/21/23, 5:37 AM

they're just being explicit

cathei•1/21/23, 6:09 AM

While it would have default value, analyzer could yell at you for not assigning anything. Especially for static readonly it’s better to be explicit

333fred•1/21/23, 6:13 AM

For the specific reason of why

default

default

exists, and we don't just tell people to use

null

null

or , consider generics:

Accord•1/22/23, 6:42 AM

Was this issue resolved? If so, run

/close

/close

otherwise I will mark this as stale and this post will be archived until there is new activity.

swilliOP•1/23/23, 2:30 AM

That generic local makes things clear. Thanks everyone.