Throw expressions

[thekid]

In a nutshell

return $user ?? throw new IllegalStateException('No such user');

Would be allowed for the ternary operator, the null-coalesing operator and inside of compact functions.

See also

• https://blogs.msdn.microsoft.com/dotnet/2017/03/09/new-features-in-c-7-0/
• https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/throw
• https://github.com/tc39/proposal-throw-expressions

[thekid]

Could be realized by an IIFE:

// Given this input...
$a ?? throw new \lang\IllegalArgumentException("X");

// ...the compiler would emit this:
$a ?? (function() { throw new \lang\IllegalArgumentException("X"); })()

[thekid]

Good blog article on throws expressions in C# 7.0

http://gunnarpeipman.com/csharp/throw-expressions/

[thekid]

Stackoverflow question covering the problem:

https://stackoverflow.com/questions/9544976/using-throw-in-a-javascript-expression

[thekid]

In Kotlin, throw is an expression:

https://kotlinlang.org/docs/reference/exceptions.html#the-nothing-type