The built in CharSequence.repeat extension does this in an efficient way, see the source here. val str: String = “*”.repeat(100) Of course, this will still require O(n) steps to create the string. However, using this built-in stdlib function has its advantages: it’s cross-platform, easy to read, and can be improved in performance over time, if …
IntelliJ gives you nice help here: Which adds @Suppress(“NOTHING_TO_INLINE”) to resolve the warning. Some of the possible names of the compiler diagnostics to suppress can be found in Errors.java and DefaultErrorMessages.java i.e.: REDUNDANT_MODIFIER, “Modifier ”{0}” is redundant because ”{1}” is present”
This is not allowed because of possible counter-intuitive behavior with regard to several init { … } blocks, which might lead to subtle bugs: class C { init { if (someCondition) return } init { // should this block run if the previous one returned? } } If the answer is ‘no’, the code becomes …
Your code doesn’t copy the sequence elements, and sequenceOf(seq1, seq2).flatten() actually does what you want: it generates a sequence that takes items first from seq1 and then, when seq1 finishes, from seq2. Also, operator + is implemented in exactly this way, so you can just use it: (seq1 + seq2).forEach { … } The source …
The following syntax has worked to me. mockkStatic(::sayHello.javaMethod!!.declaringClass.kotlin) I’m surprised there is nothing on the jvm-stdlib yet for this. Edit: This overload has now been introduced officially: https://github.com/mockk/mockk/pull/518 mockkStatic(::sayHello)
Try var str = “This is an example text”.filter { !it.isWhitespace() }
The kotlinx.coroutines library actually makes use of multiplatform projects since it supports both the JVM and JS compilation targets. You can find the common module here, and the specific expect declarations for the functions you’ve mentioned here.
Kotlin is all about Java interoperability and defining a function as a val will produce a completely different result in terms of the interoperability. The following Kotlin class: class A { fun f(x: Int) = 42 val g = fun(x: Int) = 42 } is effectively equivalent to: public class A { private final Function1<Integer, …
var age : Int? = 0 public val isAdult : Boolean? get() = age?.let { it >= 18 } The other solution would be using delegates: var age : Int by Delegates.notNull() public val isAdult : Boolean get () = age >= 18 So if you try to get age or check isAdult before age …
Since Kotlin 1.2, the command line argument -Werror is supported. In Gradle, it’s named allWarningsAsErrors: compileKotlin { kotlinOptions.allWarningsAsErrors = true }