View Source Quark.SKI (Quark v2.3.3-doma)
The classic SKI
system of combinators. s
and k
alone can be used to express any algorithm,
though generally not efficiently.
Link to this section Summary
Functions
See Quark.SKI.k/2
.
The identity combinator. Also aliased as id
.
See Quark.SKI.i/1
.
The constant ("Konstant") combinator. Returns the first argument unchanged, and discards the second argument.
The "substitution" combinator. Applies the last argument to the first two, and then the first two to each other.
Opposite of first
(the k
combinator).
Link to this section Functions
See Quark.SKI.k/2
.
See Quark.SKI.k/2
.
The identity combinator. Also aliased as id
.
iex> i(1)
1
iex> i("identity combinator")
"identity combinator"
iex> [1,2,3] |> id
[1,2,3]
See Quark.SKI.i/1
.
The constant ("Konstant") combinator. Returns the first argument unchanged, and discards the second argument.
Can be used to repeatedly apply the same value in functions such as folds.
Aliased as first
and constant
.
examples
Examples
iex> k(1, 2)
1
iex> k("happy", "sad")
"happy"
iex> Enum.reduce([1,2,3], [42], &k/2)
3
iex> Enum.reduce([1,2,3], [42], &constant/2)
3
iex> first(1,2)
1
The "substitution" combinator. Applies the last argument to the first two, and then the first two to each other.
examples
Examples
iex> add = &(&1 + &2)
...> double = &(&1 * 2)
...> s(add, double, 8)
24
Opposite of first
(the k
combinator).
While not strictly part of SKI, it's a common enough case.
Returns the second of two arguments. Can be used to repeatedly apply the same value in functions such as folds.
examples
Examples
iex> second(43, 42)
42
iex> Enum.reduce([1,2,3], [], &second/2)
[]