Check if variable is string/int/float?

php editor Xiaoxin introduces you how to check whether a variable is a string, integer or floating point number. In PHP, we can use some built-in functions to achieve this purpose. First, use the is_string() function to check whether a variable is of string type. If true is returned, it means that the variable is of type string. Next, use the is_int() function to check whether a variable is of integer type. Likewise, if true is returned, it means that the variable is of integer type. Finally, use the is_float() function to check whether a variable is of floating point type. Likewise, if true is returned, it means that the variable is of floating point type. By using these functions, we can easily check the type of a variable and perform appropriate operations as needed.

Question content

Get this type map[string]interface{} because I want to allow for both strings and integers map

But how do I convert a map to map[string]string and return an error if any value is "not supported"?

value, ok := v.(string)

If the value is an integer, an error will be thrown

Solution

Go supports type switches:

For your use case it would look like:

m := map[string]string{}
for k,v := range values {
    switch value := v.(type) {
        switch value := v.(type) {
        case int:
            m[k] = fmt.Sprintf("%v", value)

        case float64:
            m[k] = fmt.Sprintf("%v", value)

        case string:
            m[k] = fmt.Sprintf("%v", value)

       default:
            return nil,fmt.Errorf("unknown type %T", v)
    }
}

return m,nil

If you want, you can merge these cases into one case, for example https://www.php.cn/link/658953f1f681915f543a40eef9acb562

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