Basic

beginner1 of 8

Learn about basic in fp-ts readertaskeither

Code Editor

01-basic.exercise.ts

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Test Results

Requirements

describe('ReaderTaskEither basic', () => {
  const config: Config = { apiUrl: 'https://api.example.com' }

  it('reads config and returns Right', async () => {
    const result = await getApiUrl()(config)()
    expect(E.isRight(result)).toBe(true)
    if (E.isRight(result)) {
      expect(result.right).toBe('https://api.example.com')
    }
  })

  it('creates Left error', async () => {
    const result = await failWithError('Something went wrong')(config)()
    expect(E.isLeft(result)).toBe(true)
    if (E.isLeft(result)) {
      expect(result.left).toBe('Something went wrong')
    }
  })
})
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Pro Tips

💡 Stuck? Here's what to try:

  • • Read the comments in the code carefully
  • • Run tests frequently to get feedback
  • • Check the fp-ts documentation
  • • Use the solution if you need help

🚀 Learning Approach:

  • • Focus on understanding, not just solving
  • • Experiment with different approaches
  • • Think about real-world applications
  • • Build on previous exercises