Kotlin与Swift 从零开始（一）基础语法

Swift刚出来的时候学过一遍，2年了，Kotlin出来了，我看着和Swift相似。写写复习Swift学习Kotlin。

学习工具介绍：由于属于语法学习，本人推荐 Swift：在Xcode新建playground进行学习，直观迅速。 Kotlin:用官网上的在线编译工具即可. 传送门

下面是一个国外工程师总结的语法 参考至：http://nilhcem.com/swift-is-like-kotlin/

BASICS

Hello World

Swift

print(“Hello, world!”) Kotlin

println(“Hello, world!”) 变量和常量

Swift

var myVariable = 42 myVariable = 50 let myConstant = 42 Kotlin

var myVariable = 42 myVariable = 50 val myConstant = 42 显式类型

Swift

let explicitDouble: Double = 70 Kotlin

val explicitDouble: Double = 70.0 强制类型转换

Swift

let label = “The width is ” let width = 94 let widthLabel = label + String(width) Kotlin

val label = “The width is ” val width = 94 val widthLabel = label + width 字符串插值

Swift

let apples = 3 let oranges = 5 let fruitSummary = “I have (apples + oranges) ” + “pieces of fruit.” Kotlin

val apples = 3 val oranges = 5 val fruitSummary = “I have ${apples + oranges} ” + “pieces of fruit.” 范围操作符

Swift

let names = [“Anna”, “Alex”, “Brian”, “Jack”] let count = names.count for i in 0..