Map.has_key-question-mark

You're seeing just the function has_key-question-mark, go back to Map module for more information.

Specs

has_key?(map(), key()) :: boolean()

Returns whether the given key exists in the given map.

Inlined by the compiler.

Examples

iex> Map.has_key?(%{a: 1}, :a)
true
iex> Map.has_key?(%{a: 1}, :b)
false