in java i can do ```if x =null amp amp x name equals name ``

Question

in java i can do ```if x =null amp amp x name equals name ``` first evaluate if x is not null then second condition second condition is not checked if x is null and then is false since amp amp operator only true when all its true must stop evaluating second condition is this by desing how could I do this in kotlin

Dominaezzz · Answer

That should be copy paste compatible with kotlin

Shawn · Answer

you can do exactly this safely thanks to smart casting but you might also consider the more idiomatic `if x name == name `

Shawn · Answer

or `if x = null amp amp x name == name ` if you want the short circuit semantics to be obvious

Juanoterocas · Answer

now is working thanks for your help

Matt Thompson · Answer

you might also consider `takeIf` `x takeIf it name == name let `

DALDEI · Answer

These idioms start to concern me after awhile they seem overtly ineffecient proably are not but just seems like x takeIf it name == name let with 2 lambdas 5+ expression etc just cant be as clean as if x = null amp amp x name == name likewise expr let it dosometing vs if expr = null expr doSometing I know what the purpose is wrt nullability guarentees and multiple evaluation points for expresions but it just seems wrong

Shawn · Answer

yeah at a glance I d definitely call that over kotlinized lol

Shawn · Answer

there s really nothing wrong with a simple `if` null check every now and again

DALDEI · Answer

kneed a KWord for KoltinifiKation

DALDEI · Answer

Particularly unhappy with how paiinfully difficult it was to finally deduce aka after atleast 10 hints corrections advise from someone who knew and was so obvious to that my density seemed unimangable This tiny example from my bare minimal scripting example <https github com DALDEI kotlin script sample> `val compilation ScriptCompilationConfiguration Builder gt Unit = ` ` jvm ` ` limit or extend classpath` ` mylib jar another jar wholeClasspath = imTooLazy` ` dependenciesFromCurrentContext wholeClasspath = true ` ` ` ` `

DALDEI · Answer

There is NO WAY I could have ever deduced that expression incantation from either docs samples or soruce of which I had all 3 AND personal assistance AND a year on off looking at it

DALDEI · Answer

THe irony being I know the intent is a clean and simple obvious DSL and I suspect someday it might actually be one but in the current state its well I cant think of a word more torturous then torture slightly smiling face

Matt Thompson · Answer

yeah I agree with you that chaining `takeIf` and `let` in this case is not preferable to a simple if check just sayin it s an option man shrugging