最后一个contract 契约,指的是代码和 Kotlin 编译器的契约。举一个例子,我们对局部变量增加了如果为空则 return 的逻辑,Kotlin 编译器便可以智能的识别出 return 之后的局部变量一定不为空,局部变量的类型会退化为非空类型。但如果我们把是否为空的代码封装进一个扩展方法如Any?.isNotNull()里,那么编译器就无法...
fun test(a:Int,b:Int = 3):Int{//b的默认值是3,所以调用的时候可以只传一个值,该值会被赋值给a。 return a+b } 1. 2. 3. 4. 5. 6. 参数名=值的方式为指定的参数进行赋值。如: fun main(args:Array<String>){ reformat("hhh",wordSeparator="xxx")//为指定的参数进行赋值 } fun reformat...
Afunction signatureis a unique identification of a function for the Kotlin compiler. The signature consists of a function name, its parameters, and the return type. Functions in Kotlin are declared with thefunkeyword. The body of a function is called a block and is enclosed within{ }curly br...
在Kotlin中,太多的功能都是通过使用函数作为参数来实现,有的已经不能叫做语法,然而函数嵌套,infix function call,lambda,函数参数,可变参数列表,灵活的标签,强大的return,自动类型判断,Range,iterator,操作符重载,省略,模板...这些太多的功能,导致Kotlin的语法眼花缭乱,虽然有时看起来很优雅,但是也可能给人阅读代码带来...
Kotlin Code: fun calculateSum(num1: Int, num2: Int): Int { return num1 + num2 } fun main() { val sum = calculateSum(7, 9) println("Sum: $sum") } Sample Output: Sum: 16 Explanation: In the above exercise - The "calculateSum()" function takes two parameters num1 and num2,...
return f(x,y); }; console.log( fn(4,5) ); //输出:20 console.log( fn(4,5, (x,y) => x+y) ); //输出:9 1. 2. 3. 4. 5. 函数默认值得一个实际应用, 设置一个参数为必须传, 不传者报错; function fn( foo = (()=>{throw new Error("Missing parameter")})()) { ...
return true } } System.out.println("Thank you users kindly write the code that related to the kotlin inline function") return false } fun main(args: Array<String>) { demo<String>(listOf("raman", 2, args)) val second = mapOf<String, Int>("Employee ID" to 2001, "SNO" to 7536,...
Function references are another of those great improvements that we get with Kotlin, which are kind of exotic when we come from Java. You already know that Kotlin supports functions as a type, what means that you can save a function in a variable, use it as another function argument, or ...
Learn about the Kotlin Array Component4 function, its usage, syntax, and examples to enhance your Kotlin programming skills.
Finally, in Kotlin,functions can be declared at the top level, also known aspackage-level functions.Next, let’s create a top-level function: fundecrypt(segments:List<String>): String {returnsegments.reversed().joinToString(separator =" ") { it.reversed() } } ...