javascript closure example

closure-example.js

function apiConnect(apiKey) {
  function get(route) {
    return fetch(`${route}?key=${apiKey}`)
  }

  function post(route, params) {
    return fetch(route, {
      method: 'POST',
      body: JSON.stringify(params),
        headers: {
          'Authorization': `Bearer ${apiKey}`
        }
    })
  }
  return { get, post }
}
const api = apiConnect('my-secret-key')

// No need to include the apiKey anymore
api.get('http://www.example.com/get-endpoint')
api.post('http://www.example.com/post-endpoint', { param: 'string' })