golang 返回值报错cannot use nil as type string in return argument
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在刚刚开始使用golang写代码的时候,经常会放错。给一个变量放回一个nil,这个通常编译的时候不会报错,但是运行是时候会报cannot use nil as type string in return argument的错误,对于nil,一般通常指针类型和interface类型可以使用这样的返回值
func Get(m map[int]string, id int) (string, bool) {if _, exist := m[id]; exist {return "存在数据", true}return nil, false}
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