Others covered this, but let me try to explain. In Go, plain = just assigns to an already existing variable
var x bool // declares a variable, it starts with the zero value for the type x = true // assigns a value to the variable y := true // declares the variable and assigns it a value Now, the tricky thing is when you have two values being assigned/declared, like foo, err := bar(). In this case, as long as either or both variables hasn't been declared, then := will declare one or both, and assign to one that's already declared. This makes it easier to do long lists of calls that return an error, without having to use err1, err2, etc. But it does kind of muddy the waters for when to use = and when to use :=. := has to always make at least one new variable. = always just copies a value to an existing variable or struct field. So, like, you can't ever use := to put something in a struct field (s.foo := bar will never work). You'll get the hang of it. You'll use := most of the time, and only = for spots where the stuff on the left hand side is already declared. -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
