How to check if a map contains a key in Go?

Question

I know I can iterate over a map m by, for k, v := range m { ... } and look for a key but is there a more efficient way of testing a key's existence in a map? I couldn't find the answer in the language spec.

Chris Gregori · Accepted Answer

One line answer: if val, ok := dict["foo"]; ok { //do something here } Explanation: if statements in Go can include both a condition and an initialization statement. The example above uses both: initializes two variables - val will receive either the value of "foo" from the map or a "zero value" (in this case the empty string) and ok will receive a bool that will be set to true if "foo" was actually present in the map evaluates ok, which will be true if "foo" was in the map If "foo" is indeed present in the map, the body of the if statement will be executed and val will be local to that scope. Check below example to check wheter a key is present in map

Go Language

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