Keyword.replace-exclamation-mark

You're seeing just the function replace-exclamation-mark, go back to Keyword module for more information.

replace!(keywords, key, value)

(since 1.5.0)

Specs

replace!(t(), key(), value()) :: t()

Puts a value under key only if the key already exists in keywords.

If key is not present in keywords, a KeyError exception is raised.

Examples

iex> Keyword.replace!([a: 1, b: 2, a: 3], :a, :new)
[a: :new, b: 2]
iex> Keyword.replace!([a: 1, b: 2, c: 3, b: 4], :b, :new)
[a: 1, b: :new, c: 3]

iex> Keyword.replace!([a: 1], :b, 2)
** (KeyError) key :b not found in: [a: 1]