refactor: move randomAdjective() in separate file

index.js

@@ -1,17 +1,14 @@
 module.exports = generateRandomString
 
-const adjectives = require('adjectives')
 const animals = require('animals')
 const randomNumber = require('random-number-in-range')
 
+const randomAdjective = require('./lib/random-adjective')
+
 function generateRandomString (num) {
   if (typeof num === 'number') {
     return Array(num).fill().map(generateRandomString)
   }
 
   return [randomAdjective(), animals(), randomNumber(10, 99)].join('-')
 }
-
-function randomAdjective () {
-  return adjectives[randomNumber(0, adjectives.length - 1)]
-}

lib/random-adjective.js

@@ -0,0 +1,6 @@
+const adjectives = require('adjectives')
+const randomNumber = require('random-number-in-range')
+
+module.exports = function randomAdjective () {
+  return adjectives[randomNumber(0, adjectives.length - 1)]
+}