Provides pure functional combinators.
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Members
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<static> apply
(a → b) → a → b
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Applies a function to an argument.
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Example
var inc = (a) => a + 1 apply(inc)(3) // => 4
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<static> compose
(b → c) → (a → b) → (a → c)
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Composes two functions together.
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Example
var inc = (a) => a + 1 var square = (a) => a * a compose(inc)(square)(2) // => 5, inc(square(2))
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<static> constant
a → b → a
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The constant combinator. Always returns the first argument it's given.
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Example
constant(3)(2) // => 3 constant('foo')([1]) // => 'foo' -
<static> curry
Number → ((a1, a2, ..., aN) → b) → (a1 → a2 → ... → aN → b)
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Transforms any function on tuples into a curried function.
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Example
var sub3 = (a, b, c) => a - b - c curry(3, sub3)(5)(2)(1) // => 2
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<static> flip
(a → b → c) → (b → a → c)
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Inverts the order of the parameters of a binary function.
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Example
var subtract = (a) => (b) => a - b subtract(3)(2) // => 1 flip(subtract)(3)(2) // => -1
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<static> identity
a → a
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The identity combinator. Always returns the argument it's given.
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Example
identity(3) // => 3 identity([1]) // => [1]
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<static> spread
(a1 → a2 → ... → aN → b) → (#[a1, a2, ..., aN) → b)
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Transforms a curried function into one accepting a list of arguments.
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Example
var add = (a) => (b) => a + b spread(add)([3, 2]) // => 5
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<static> uncurry
(a1 → a2 → ... → aN → b) → ((a1, a2, ..., aN) → b)
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Transforms a curried function into a function on tuples.
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Example
var add = (a) => (b) => a + b uncurry(add)(3, 2) // => 5
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<static> upon
(b → b → c) → (a → b) → (a → a → c)
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Applies an unary function to both arguments of a binary function.
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Example
var xss = [[1, 2], [3, 1], [-2, 4]] sortBy(upon(compare, first))