BiMap v1.2.0

BiMap.put_new_key

You're seeing just the function put_new_key, go back to BiMap module for more information.
Link to this function

put_new_key(bimap, key, value)

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Specs

put_new_key(t(), k(), v()) :: t()

Inserts {key, value} pair into bimap if key is not already in bimap.

If key already exists in bimap, bimap is returned unchanged.

If key does not exist and value is already in bimap, any overlapping bindings are deleted.

Examples 

iex> bimap = BiMap.new
#BiMap<[]>
iex> bimap = BiMap.put_new_key(bimap, :a, 0)
#BiMap<[a: 0]>
iex> bimap = BiMap.put_new_key(bimap, :a, 1)
#BiMap<[a: 0]>
iex> BiMap.put_new_key(bimap, :b, 1)
#BiMap<[a: 0, b: 1]>
iex> BiMap.put_new_key(bimap, :c, 1)
#BiMap<[a: 0, c: 1]>