Added eslint and fixed all errors

.eslintrc

@@ -0,0 +1,82 @@
+{
+  "env": {
+    "browser": true,
+    "es6": true
+  },
+  "globals": {
+    "p5": true,
+    "assert": true,
+    "expect": true,
+    "sinon": true,
+    "birdSprite": true,
+    "pipePeakSprite": true,
+    "pipeBodySprite": true,
+    "Bird": true,
+    "Pipe": true,
+  },
+  "extends": [
+    "eslint:recommended",
+    "p5js",
+    "p5js/dom"
+  ],
+  "rules": {
+    "arrow-parens": [
+      "error"
+    ],
+    "brace-style": [
+      "error",
+      "1tbs"
+    ],
+    "comma-dangle": [
+      "error",
+      "only-multiline"
+    ],
+    "keyword-spacing": [
+      "error",
+      {
+        "before": true,
+        "after": true
+      }
+    ],
+    "max-len":[
+      "error",
+      {
+        "code": 100,
+        "ignoreUrls": true
+      },
+    ],
+    "max-params": [
+      "error",
+      6
+    ],
+    "no-cond-assign": [
+      2,
+      "except-parens"
+    ],
+    "eqeqeq": ["error", "smart"],
+    "no-use-before-define": [
+      2,
+      {
+        "functions": false
+      }
+    ],
+    "new-cap": 0,
+    "no-caller": 2,
+    "no-undef": 2,
+    "no-unused-vars": ["error", { "args": "none" }],
+    "no-empty": ["error", { "allowEmptyCatch": true }],
+    "no-console": "off",
+    "quotes": [
+      "error",
+      "single"
+    ],
+    "semi": [
+      "error",
+      "always"
+    ],
+    "space-before-blocks": [
+      "error",
+      "always"
+    ]
+  },
+}

.gitignore

@@ -0,0 +1 @@
+node_modules/

bird.js

@@ -3,6 +3,9 @@
 // http://patreon.com/codingtrain
 // Code for: https://youtu.be/cXgA1d_E-jY
 
+// Class is exported (eslint flag)
+/* exported Bird */
+
 class Bird {
   constructor() {
     this.y = height / 2;
@@ -19,7 +22,7 @@ class Bird {
 
   show() {
     // draw the icon CENTERED around the X and Y coords of the bird object
-    image(this.icon, this.x - (this.width / 2), this.y - (this.height / 2), this.width, this.height);
+    image(this.icon, this.x - this.width / 2, this.y - this.height / 2, this.width, this.height);
   }
 
   up() {