// 纯函数 function add(a, b) { return a + b; } // 非纯函数 let counter = 0; function incrementCounter() { counter++; // 副作用 return counter; } Kotlin通过val和不可变集合强化不可变性,比JavaScript的const提供更强的保证。在JavaScript中,即使用const声明对象,其内部属性仍然可以被修改,而Kot...
Consider the following function for example - fundisplayGreeting(message:String,name:String="Guest"){println("Hello$name,$message")} If you call the above function with two arguments, it works just like any other function and uses the values passed in the arguments - ...
Kotlin function arguments may have default values; they are used if no value is provided for the argument. Main.kt package com.zetcode fun power(a: Int, b: Int = 2): Int { if (b == 2) { return a * a } var value = 1 repeat(b) { value *= a } return value; } fun main(...
Function Arguments In Kotlin, function arguments can use names and default values. This simplifies reading and understanding at the call site and allows to limit the number of function overloads. Because you do not have to make a new function for every argument that is optional, you just put...
命名参数/具名参数 (Named arguments) 以前面的函数为例子,我们调用它: helloFunction("Kotlin") 和Java 一样。 不过,Kotlin 提供了一些新的特性,如命名函数参数举个例子,现在有一个函数: fun createUser( name: String, age: Int, gender: Int, friendCount: Int, feedCount: Int, likeCount: Long, commen...
函数声明( Define Function ) 让函数更好的调用( Making functions easier to call ) 命名参数/具名参数 (Named arguments) 参数默认值(Default arguments) 变量(Variables) 在Java/C 当中,如果我们要声明变量,我们必须要声明它的类型,后面跟着变量的名称和对应的值,然后以分号结尾。就像这样: ...
arguments.map { result = result.plus(BigDecimal(it.toString())) }returnresult } mathPlus(1,2,3,4.5) --->10.5 尾递归函数 Kotlin支持尾递归的编程风格。允许一些算法可以通过循环而不是递归解决问题,避免堆栈溢出导致的系统不稳定。Kotlin还提供了尾递归优化的关键字tailrec。但要符合 tailrec 修饰符的条件...
fun main(args: Array<String>) {val arg1 = args[0].toInt()val arg2 = args[1].toInt()println("$arg1+$arg2= ${sum(arg1, arg2)}")}fun sum(arg1: Int, arg2: Int): Int {return arg1 + arg2}kotlin简便写法:fun sum(arg1: Int, arg2: Int) = arg1 + arg2...
fundisplayBorder(character:Char='=', length:Int=15){for(iin1..length) { print(character) } }funmain(args:Array<String>){ displayBorder(5) } Here, we are trying to pass second argument to thedisplayBorder()function, and use default argument for first argument. However, this code will ...
([Ljava/lang/String;)V", "Sum", "Lkotlin/Function3;", "", "production sources for module Lambda_main"}表示记录有main函数,已经main函数参数名称args,Sum就是通过typealias取lambda表达式类型别名,Lkotlin/Function3声明的是Lambda表达式中生成的这个类是实现了FunctionN中Function3接口,因为它对应只有三个...