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                > ### 變量(補充:類型推斷的好處) ~~~ var name string //可以在函數外或者函數內聲明一個變量 name="winnie" ~~~ * * * ~~~ name:="winnie" //只能在函數內使用 ~~~ * * * > 例子 ~~~ package main import "fmt" func Calculation() (num int) { num = 5 return } func main() { var number int number = Calculation() fmt.Println(number) } ~~~ * 修改某個程序與外界的交互規則, 只改變內部的實現而不影響外部 * 修改Calculation的返回類型時,也要修改number的類型 * 修改了接口返回值類型, 接口外部也要跟著改(number := Calculation()則不要) * Go語言的類型推斷可以明顯提升程序的靈活性, 使得代碼重構變得更加容易(寫起來像動態語言) ~~~ package main import "fmt" func Calculation() (num string) { num = "5" return } func main() { var number string number = Calculation() fmt.Println(number) } ~~~
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