Skip to main content

composition()

composition<A, B>(f): <C>(g) => (x) => B

Pass a value to a function and then the result to another function.

Type Parameters​

A​

A

The type of the first function's input value. Corresponds to the return type of the second function.

B​

B

The return type of first function.

Parameters​

f​

(z) => B

The second function in the composition.

Returns​

<C>(g): (x) => B

Type Parameters​

C​

C

Parameters​

g​

(y) => A

Returns​

(x): B

Parameters​

x​

C

Returns​

B

Remarks​

B combinator

λabc.a(bc)

composition :: (a → b) → (c → a) → c → b

pure function

Example​

composition((x) => x + 8)((x) => x * 3)(4);
// 20