在Go中检查字符串指针的长度

Question

How do I go about finding the length of a string pointer which comes from a struct. Currently I am writing unit tests and want to see whether a string pointer is less than 250 characters. If r is my and myString is a string pointer.

This code is not valid:

if len(r.myString) > 256 {
    return ErrStringTooLong
}

Answer 1

you can access an object with a star before pointer variable name for eg len(*r.myString)

playground example