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Elvis (feddit.it)

submitted 1 week ago by [email protected] to c/[email protected]

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[–] [email protected] 13 points 1 week ago (2 children)

On the left you have Elvis Presley, while on the right there's the so-called Elvis operator

[–] [email protected] 3 points 6 days ago (2 children)

why would you call it anything other than the ternary operator

[–] [email protected] 3 points 5 days ago* (last edited 5 days ago) (1 children)

Because it's not one. Ternary operator is A ? B : C, Elvis operator is A ?: B. The same two characters are involved, but both the syntax and effect is different.

[–] [email protected] 2 points 4 days ago (1 children)

The second one isn't valid syntax in any programming language I'm familiar with. What does it do?

[–] [email protected] 4 points 4 days ago (1 children)

It's a shorthand for writing this:

variable = if (input != null) input else default

This is equivalent:

variable = input ?: default

[–] [email protected] 2 points 4 days ago* (last edited 4 days ago) (1 children)

Huh. Neat feature.

[–] [email protected] 2 points 4 days ago* (last edited 4 days ago)

It's in Kotlin and some other languages. C# has it but there it's actually A ?? B.

[–] [email protected] 2 points 6 days ago

Read further down on my other comment to understand, it's just how the operator looks

[–] [email protected] 14 points 1 week ago (3 children)

been programming since 2008. the fuck is an elvis operator?

[–] [email protected] 3 points 5 days ago* (last edited 5 days ago)

It's a shorthand for writing this:

variable = if (input != null) input else default

This is equivalent:

variable = input ?: default

The answers confusing it with the ternary operator are wrong.

[–] [email protected] 8 points 1 week ago

Been programming since the 80s, ditto.

[–] [email protected] 4 points 1 week ago (1 children)

Ternary if?then:else

[–] [email protected] 4 points 1 week ago (1 children)

gotacha. i've only ever heard them called ternaries. maybe i'm old. maybe i'm too young. definitely one of the two

[–] [email protected] 8 points 1 week ago

It specifically refers to this shorthand ?: that works like this:

$value = $thing_that_could_be_truthy ?: 'fallback value';

# same as

$value = $thing_that_could_be_truthy ? $thing_that_could_be_truthy : 'fallback value';

The condition is also the value if it is truthy