Add eslint

.eslintrc.json

@@ -0,0 +1,3 @@
+{
+    "extends": "airbnb-base"
+}

index.js

@@ -1,3 +1 @@
-'use strict';
-
-module.exports = require('./lib/projection');
+module.exports = require('./lib/projection');

lib/cache.js

@@ -1,43 +1,41 @@
-'use strict'
-
 function Cache(ttl) {
   this._hash = {};
-  this._ttl = (ttl) ? ttl : 1000 * 60; // Default to 1 min
-};
+  this._ttl = (ttl) || 1000 * 60; // Default to 1 min
+}
 
 // Public
-Cache.prototype.get = function(key) {
-  //console.log(this._cache[key])
+Cache.prototype.get = function (key) {
+  // console.log(this._cache[key])
   return (this._hash[key]) ? this._hash[key].v : undefined;
 };
 
 // Public
-Cache.prototype.set = function(key, value) {
+Cache.prototype.set = function (key, value) {
   // console.log('Added to cache');
-  var self = this;
+  const self = this;
 
-  var timeout = setTimeout(function() {
-    //console.log('timeout reached');
+  const timeout = setTimeout(() => {
+    // console.log('timeout reached');
     delete self._hash[key];
   }, this._ttl);
 
   this._hash[key] = { v: value, t: timeout };
 };
 
 // Public
-Cache.prototype.del = function(key) {
-  //console.log('Delete ' + key);
+Cache.prototype.del = function (key) {
+  // console.log('Delete ' + key);
   clearTimeout(this._hash[key].t);
   delete this._hash[key];
 };
 
 // Public
-Cache.prototype.clear = function() {
-  //console.log('Cache cleared');
-  for (var key in this._hash) {
+Cache.prototype.clear = function () {
+  // console.log('Cache cleared');
+  for (const key in this._hash) {
     clearTimeout(this._hash[key].t);
   }
   this._hash = {};
 };
 
-module.exports = Cache;
+module.exports = Cache;