moy-fp/test/Object/set.test.js

A functional programming library.

import __ from '../../src/Function/__'
import lensProp from '../../src/Object/lensProp'
/**
 * Lens s a -> a -> s -> s
 * Lens s a = Functor f => (a -> f a) -> s -> f s  
 */
import set from '../../src/Object/set'

test('set(not using __)', () => {
  expect(
    set(lensProp('a'))(2)({a: 1})
  ).toEqual({a: 2})
})

test('set(using __)', () => {
  expect(
    set(lensProp('a'), __, {a: 1})(2)
  ).toEqual({a: 2})
})