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                ## 一、定義 Go 語言中 range 關鍵字用于 for 循環中迭代數組(array)、切片(slice)、通道(channel)或集合(map)的元素。在數組和切片中它返回元素的索引和索引對應的值,在集合中返回 key-value 對。 ~~~ package main import "fmt" func main() { //實例1(求數組中的和) nums := []int{1, 2, 3, 4} sum := 0 for _, num := range nums { sum += num } fmt.Println("sum:", sum) for i, v := range nums { fmt.Printf("下標為:%d;值為:%d\n", i, v) } //range也可以用在map的鍵值對上。 kvs := map[string]string{"title": "標題1", "desc": "描述"} for k, v := range kvs { fmt.Printf("%s ===> %s\n", k, v) } } ~~~ 執行結果: sum: 10 下標為:0;值為:1 下標為:1;值為:2 下標為:2;值為:3 下標為:3;值為:4 title ===> 標題1 desc ===> 描述
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