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| -rw-r--r-- | go.html.markdown | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/go.html.markdown b/go.html.markdown index b93cbc61..81d45b98 100644 --- a/go.html.markdown +++ b/go.html.markdown @@ -150,6 +150,13 @@ can include line breaks.` // Same string type. // hash or dictionary types of some other languages. m := map[string]int{"three": 3, "four": 4} m["one"] = 1 + // Looking up a missing key returns the zero value, + // which is 0 in this case, since it's a map[string]int + m["key not present"] // 0 + // Check if a key is present in the map like this: + if val, ok := m["one"]; ok { + // Do something + } // Unused variables are an error in Go. // The underscore lets you "use" a variable but discard its value. |