val someKotlinCollectionFunctions=listOf("distinct","map","isEmpty","contains","filter","first","last","reduce","single","joinToString")val message=someKotlinCollectionFunctions.joinToString(separator=", ",prefix="Kotlin has many collection functions like: ",postfix="and they are awesome.",limi...
# These are identicallistOf(1,2,3,4).map{it+2}listOf(1,2,3,4).map({it+2}) 6.Functions Taking Other Functions As seen in "Lambda Functions", functions can take other functions as a parameter. The "function type" which you'll need to declare functions which take other functions is...
transpose()) } @Test fun `Simple transposition test`() { val transposed = listOf(listOf(1, 4), listOf(2, 5), listOf(3, 6)) assertEquals(transposed, list.transpose()) } } 内联修饰符的成本 内联不应该被过度使用,因为它也是有成本的。我想在代码中打印出更多的数字2, 所以我就定义了下面...
泛型函数(Generic Functions) 函数可以使用泛型参数,泛型参数在函数名之前使用尖括号指定: fun <T> singletonList(item: T): List<T> { // ... } 内联函数(Inline Functions) 内联函数参见这里 扩展函数 扩展函数参见这里 高阶函数和λ表达式(Higher-Order Functions and Lambads) 高阶函数和λ表达式参见他们...
Whenworking withListin Kotlin, we often need to perform some operation on each list element. Kotlin provides a powerful set of functions to apply functions to list elements effectively. In this tutorial, we’ll explore various methods and approaches for this common task. ...
在这里声明成了Collection接口类的扩展函数,这样就可以直接通过list进行调用, 在扩展函数里面照常可以使用this,这里的this就是指向接收者对象,在这里就是list。 代码语言:java 复制 val list=arrayListOf("10","11","1001")println(list.joinToString())>>>[10111001] ...
类似listOf、Array.asList这样的Helper functions它们返回的是java.util.Arrays$ArrayLis,而不是java.util.ArrayList,所以,他们是不能修改的。 Fun with composition valincrement = { i:Int-> i +1} valbicrement = { i:Int-> i +2} valdouble = { i:Int-> i *2} ...
The example creates a function that calculates the average of the added values. It uses an anonymous function, which calculates the average from the list of values. The anonymous function has access to thenumslist, which stores the values and is defined outside of the function body of the an...
Output: ...print list... Ajay Vijay Prakash ...list.set(2,"Rohan")... ...print list... Ajay Vijay Rohan Kotlin arrayListOf() Example - add and print Employee data Let's create an another example of arrayListOf() function of ArrayList class. In this example we are adding and trave...
vala=arrayOf(1,2,3)vallist=asList(-1,0,*a,4) 如果想传递一个原始类型的数组中的元素给vararg,需要使用toTypedArray()函数转化之后再操作: vala=intArrayOf(1,2,3)// IntArray 是原始类型的数组vallist=asList(-1,0,*a.toTypedArray(),4) ...