Kotlin now supports SAM conversion for Kotlin interfaces. Note that it works differently than in Java: You need to mark functional interfaces explicitly. After you mark an interface withfunkeyword, you instead can pass a lambda as an argument whenever such an interface is expected as a parameter...
The community has requested us to introduce support for SAM conversions for Kotlin classes (KT-7770). SAM conversion applies if you pass a lambda as an argument when an interface or a class with only one single abstract method is expected as a parameter. Then the compiler automatically convert...
The last statement must be an expression, whose result will become the return value of the lambda (unless Unit is the return type of the variable/parameter that the lambda expression is assigned to, in which case the lambda has no return value). A lambda expression is enclosed in curly ...
对一个非空(non-null)对象执行 lambda 表达式:let 将表达式作为变量引入为局部作用域中:let 对象配置:apply 对象配置并且计算结果:run 在需要表达式的地方运行语句:非扩展的 run 附加效果:also 一个对象的一组函数调用:with 不同作用域函数的使用场景存在重叠,可以根据项目或团队中使用的特定约定来选择使用哪些函数...
val objects: Source<Any> = strs // This is OK, since T is an out-parameter // ... } 同理,用in进行逆变,只能用于消费者,只能作为方法的参数,或者保证不get, 如: interface Comparable<in T> { operator fun compareTo(other: T): Int ...
- The updateResults() parameter is declared as suspend in loadContributorsProgress(). It's necessary to call withContext, which is a suspend function inside the corresponding lambda argument. | = Channels Writing code with a shared mutable state is quite difficult and error-prone (like in ...
println("result =$result")// The last expression in a lambda is considered the return value:result })// Parameter types in a lambda are optional if they can be inferred:valjoinedToString = items.fold("Elements:", { acc, i -> acc +" "+ i })// Function references can also be used...
button. Suppose I want Title on Click of more Button, then I will pass it as a parameter ...
using feature with a MetaFeature-provider-lambda (as shown in Property and Methods) Instead, we encourage you to pass a class references to feature. This has the benefit, that we can always show the feature name, also in case a previous feature extraction or subject transformation failed. Fol...
If the synchronization of initialization delegate is not required, so that multiple threads can execute it simultaneously, pass LazyThreadSafetyMode.PUBLICATION as a parameter to the lazy() function. 如果初始化委托的同步锁不是必需的,这样多个线程可以同时执行,那么将 LazyThreadSafetyMode.PUBLICATION 作为...