如何使用字符串。包含在接口上

Question

I am receiving a panic on the following line of code. interface conversion: interface {} is []string, not string

My interface is a map of strings. What is the best method to find whether the figure interface contains a specific string.

if strings.Contains(figure["figure1"].(string), "one"){
}

Answer 1

Here your type assertion is wrong, you are trying to access a value from a key on your interface, which hasn't been accessed as a map, so this can't work as the interface{} isn't indexible.

What you have to do instead is to cast your whole interface to a map[string]string like such

stringMap, ok := interfaceArg.(map[string]string)
if !ok {
    return errors.New("cast failed")
}

if strings.Contains(stringMap["figure1"], "one") {
    // your code here
}