在Go中将不同的类型重新分配给变量

Question

Looking to do something like this

curr := foo()["blah"].(string)
curr, err := strconv.ParseFloat(curr, 64)

ERROR: cannot assign float64 to curr (type string) in multiple assignment

I dont want to make another temporary variable that I won't use after the conversion. I'm fairly new to Go so is there an approach that will help me avoid

temp := foo()["blah"].(string)
curr, err := strconv.ParseFloat(temp, 64)

Answer 1

You are trying to force duck-typing here, and Go is statically-typed so that's going to be hairy or impossible. This justifies having another variable:

if temp, ok := foo()["blah"].(string); ok {
        curr, err := strconv.ParseFloat(temp, 64)
        if err != nil {
                panic(err)
        }
}

Go garbage collector is pretty sick. Having an extra variable temp for a few lines isn't that bad. Also don't forget guarding over type assertion.