Fibonacci for Webtask.io

fib.js

var request = require('request')

// Fib takes an integer from the query param q, recursively calculates the fibonacci function and returns its value
var Fib = function (context, callback) {
  // apiURI should be set to the URI for this webtask
  var api = context.secrets.apiURI
  // fib(x) is provided by the query param "q"
  var x = parseInt(context.data.q)
  switch (x) {
    case 0:
      callback(null, {y: 0})
      break
    case 1:
      callback(null, {y: 1})
      break
    default:
      request({uri: api + '?q=' + (x - 1), json: true}, function (error, res, body) {
        if (error) {
          callback(error)
        } else {
          var y1 = body.y
          request({uri: api + '?q=' + (x - 2), json: true}, function (error, res, body) {
            if (error) {
              callback(error)
            } else {
              var y2 = body.y
              callback(null, {y: y1 + y2})
            }
          })
        }
      })
      break
  }
}

module.exports = Fib