Get a value from a keyword list
This example shows different ways to get values from a keyword list.
# [] can be used, first match returned
1 = [a: 1, b: 2, a: 3][:a]
# [] missing value is nil
nil = [a: 1, b: 2, a: 3][:c]
# Keyword get also works
1 = Keyword.get([a: 1, b: 2, a: 3], :a)
# missing value is nil
nil = Keyword.get([a: 1, b: 2, a: 3], :c)
# an optional default value can be specified
# for missing keys
"missing" = Keyword.get([a: 1, b: 2, a: 3], :c, "missing")
# Keyword.take returns a list of matching pairs
[a: 1, a: 3] = Keyword.take([a: 1, b: 2, a: 3], [:a])
[] = Keyword.take([a: 1, b: 2, a: 3], [:c])
# dot syntax does NOT work
# results in compile error
[a: 1, b: 2, a: 3].aDocumentation: Keyword