Code files

Chapter03/fetching-meta-data/checking-file-existence/check.js

@@ -0,0 +1,17 @@
+'use strict'
+
+const fs = require('fs')
+
+const exists = (file) => new Promise((resolve, reject) => {
+  fs.access(file, (err) => {
+    if (err) {
+      if (err.code !== 'ENOENT') { return reject(err) }
+      return resolve({file, exists: false})
+    }
+    resolve({file, exists: true})
+  })  
+})
+
+exists(process.argv[2])
+  .then(({file, exists}) => console.log(`"${file}" does${exists ? '' : ' not'} exist`))
+  .catch(console.error)