Function fibonacci

lesson8/app.js:3–21

(n)

var express = require('express');

var fibonacci = function (n) {
  if (typeof n !== 'number' || isNaN(n)) {
    throw new Error('n should be a Number');
  }
  if (n < 0) {
    throw new Error('n should >= 0')
  }
  if (n > 10) {
    throw new Error('n should <= 10');
  }
  if (n === 0) {
    return 0;
  }
  if (n === 1) {
    return 1;
  }

  return fibonacci(n-1) + fibonacci(n-2);
};

var app = express();