Go語言中判斷map中是否包含某個key的習慣性寫法

示例代碼：web package main import "fmt" func main() { //聲明並初始化一個map，key是int64類型，value是string類型 myMap := make(map[int64]string) myMap[1] = "value1" myMap[2] = "value2" myMap[5] = "value5" myMap[6]

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