moy-fp/test/Function/compose.test.js

A functional programming library.

/**
 * ((y -> z) -> (x -> y) -> ... -> (a -> b)) -> (a -> z)
 * notice that compose is not a curry function
 */
import compose from '../../src/Function/compose'

test('compose', () => {
  expect(
    compose(
      x => x * 2,
      x => x / 3,
      x => x + 1,
    )(17)
  ).toBe(12)
})