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x/rambda/source/once.spec.js

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selfrefactor/rambda
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import {once} from './once'
test('with counter', () => {  let counter = 0  const runOnce = once(x => {    counter++
    return x + 2  })  expect(runOnce(1)).toEqual(3)  runOnce(1)  runOnce(1)  runOnce(1)  expect(counter).toEqual(1)})
test('happy path', () => {  const addOneOnce = once((a, b, c) => a + b + c, 1)
  expect(addOneOnce(10, 20, 30)).toBe(60)  expect(addOneOnce(40)).toEqual(60)})