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

A functional programming library.

import __ from '../../src/Function/__'
/**
 * String -> [a] -> String
 */
import intercalate from '../../src/List/intercalate'

test('intercalate(not using __)', () => {
  expect(
    intercalate(',')([1, 2, 3, 4])
  ).toBe('1,2,3,4')
})

test('intercalate(using __)', () => {
  expect(
    intercalate(__, [1, 2, 3, 4])(',')
  ).toBe('1,2,3,4')
})