从地图获取价值时出现意外价值

Question

So I have a struct like this:

type Magni struct {
    ...
    Handlers map[string]func(*Message)
    ...
}

And I have a function to create a new instance of the struct:

func New(nick, user, real string) *Magni {
    return &Magni{
        ...
        Handlers: make(map[string]func(*Message)),
        ...
    }
}

But I can't get something from the Handlers map with the key "hey" when "hey" is in a variable, it only works if I type it myself. Here is a method of the struct Magni and m is a pointer to the struct Magni:

handler := m.Handlers[cmd[3][1:]] // cmd[3][1:] contains string "hey"
handler2 := m.Handlers["hey"]

For some reason, the value of handler is nil and the value of handler2 is 0x401310, basically I am not expecting handler to be nil.

Am I doing something wrong or is this the expected behavior?

Answer 1

Trimming the string solves the problem.

strings.TrimSpace(cmd[3])