> If you don't use the dual return it panics if the actual type is different > from the one you try to assert.
from the language specification: " x.(T) asserts that x is not nil and that the value stored in x is of type T. The notation x.(T) is called a type assertion. [...] If the type assertion holds, the value of the expression is the value stored in x and its type is T. If the type assertion is false, a run-time panic occurs." https://golang.org/ref/spec#Type_assertions the key to why _ = m["abc"] works lies in this text: "For a of map type M: x's type must be assignable to the key type of M [...] if the map is nil or does not contain such an entry, a[x] is the zero value for the value type of M" https://golang.org/ref/spec#Index_expressions -- 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.
