How to check whether generic parameter T is nullable?
Given a function how do I check whether T is nullable or not? ...
cost 89 ms
Kotlin. Vararg how to filter null values
I have an API that has method which takes vararg of some object (fox example Param). I need to filter null params and not put it to vararg. Is it poss ...
How to deal with non initialized lateinit vars
I'm migrating a project from java to kotlin, and that project used a lot of variables that can be null and they are not initialized until some interac ...
Pass null value when method declaration creates an empty map - input: Map<String, String> = emptyMap() in the interface - Kotlin
I have an interface with following declaration. I want to call this method but the params sometimes could be null. so how to handle above error? ...
Different results on similar code with safe call operator in Kotlin
I'm new to Kotlin and these two below codes give different results. Output: Compilation Error (illegal access operation) Output: null ...
Null safety in Kotlin for MutableMap with MutableList
I am trying to run this example at Online Kotlin Compiler. The compiler is complaining about Only safe (?.) or non-null asserted (!!.) calls are ...
The Difference {}, () in kotlin null check
I'm practicing null checking in kotlin When I use Elvis operator ?: I use {} but the correct way is using (). But My mistake, the result was wrong. M ...
Map get with null key
I'm confused by Kotlin's null safety features when it comes to maps. I have a Map<String, String>. Yet I can call map.get(null) and it returns n ...
I need to get list with an argument
This is my previous code. The number of arguments requested by the function is now one. How do I return the facilityId in getRadResults() This co ...
Set a value to builder if not null - Kotlin
I am new to Kotlin. Can someone tell me how can I set the value only if not null here in below cade. There should be a way to use with let() but I am ...
Kotlin-Null Safety
Well...the question is --> "Write a program to check for the null value of the variables x and y using 'Elvis' operator and '!!' operator. Need to ...
Validate null while passing parameter to a function in Kotlin
I want to call a function that is accepts only non-Null parameter. However, the parameter that I am passing sometimes could be Null. I am new to Kotli ...
Why does Kotlin's null safety not work properly with local variable initializers?
Please look at this code: fun localVarNullSafety1(){ var number: Double? = 3.0 val sum = 2.0 + number // does not compile (Type mismatch: in ...
Null safety issues with Gson in kotlin
I have a data class: When I run the following code: I get null pointer exception. Doesn't this violate the null safety of kotlin? ...
Decouple multiple variable let in Kotlin
I have a separate function that applies different gradient based on specified id, this function returns a compose Brush. When I call this function in ...
Type mismatch: inferred type is kotlin.collections.ArrayList<LiveData<List<a>>> but Collection<LiveData<List<TypeVariable(Source)>?>> was expected
I tried to use flattenLiveData() but it is exspecting kotlin.collections.ArrayList<LiveData<List<TabDefinition>>> but I am passing i ...
NavHostFragment initialization results in NullPointerException
I am attempting to set a navHostFragment in my MainActivity.kt file, but the code below results in the error: activity_main.xml layout file: W ...
Compact null and emptyness check in Kotlin?
I have a null and not empty check: I don't like the !!-Operators and I bet there is more beautiful and compact Kotlin way? PROPOSAL1: Still I h ...
Kotlin function override null check
I try to get lastLocation of user and implemented the method like this. But when I don't add null safety to parameter Location in onSuccess method, ...
How to pass a non-nullable type to a function with a nullable parameter?
A nullable type can be checked and cast to a non-nullable type, but the other way around is quite difficult. For example: In my case I'm talking a ...
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