Keyword.fetch-exclamation-mark
You're seeing just the function
fetch-exclamation-mark
, go back to Keyword module for more information.
Specs
Fetches the value for specific key
.
If key
does not exist, a KeyError
is raised.
Examples
iex> Keyword.fetch!([a: 1], :a)
1
iex> Keyword.fetch!([a: 1], :b)
** (KeyError) key :b not found in: [a: 1]