Project Elvis

[MrSmith]

On Monday, 30 October 2017 at 19:46:54 UTC, Andrei Alexandrescu 
wrote:
>> I see from comments that different people think of it in a 
>> different way. I suggest them to read this section from Kotlin 
>> docs to understand the reasoning behind the elvis operator.
>
> The principle of least astonishment indicates we should do what 
> the lowering does:
>
> expr1 ?: expr2
> ==>
> (x => x ? x : expr2)(expr1)
>
> An approach that does things any differently would have a much 
> more difficult time. It is understood (and expected) that other 
> languages have subtly different takes on the operator.
>
> Andrei

I may add that the same logic is used in .get(key, defaultValue) 
method of Associative Arrays