Process.put

You're seeing just the function put, go back to Process module for more information.

put(key, value)

put(term(), term()) :: term() | nil

Stores the given key-value pair in the process dictionary.

The return value of this function is the value that was previously stored under key, or nil in case no value was stored under it.

# Assuming :locale was not set
iex> Process.put(:locale, "en")
nil
iex> Process.put(:locale, "fr")
"en"