moy-fp/test/List/foldl.test.js

A functional programming library.

import __ from '../../src/Function/__'
/**
 * ((a, b) -> a) -> a -> [b] -> a
 */
import foldl from '../../src/List/foldl'

test('foldl(not using __)', () => {
  expect(
    foldl((acc, cur) => acc - cur)(0)([1, 2, 3, 4])
  ).toBe(-10)
})

test('foldl(using __)', () => {
  expect(
    foldl((acc, cur) => acc - cur, __, [1, 2, 3, 4])(0)
  ).toBe(-10)
})