Update polyfill to be smarter

Author: willfarrell

Diff for: .gitignore

@@ -63,3 +63,5 @@ typings/
 # IDE
 .idea
 *.iml
+
+.DS_Store

Diff for: public/index.html

@@ -34,77 +34,30 @@
 </noscript>
 <script>
     // polyfills
-
-    Number.parseInt = Number.parseInt || parseInt;              // IE 11
-    Number.parseFloat = Number.parseFloat || parseFloat;        // IE 11
-    Number.isInteger = Number.isInteger || function (value) {   // IE 11
-        return typeof value === 'number' && isFinite(value) && Math.floor(value) === value;
-    };
-
-    // Required for material-ui/Select      IE 11
-    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/includes
-    // https://tc39.github.io/ecma262/#sec-array.prototype.includes
-    if (!Array.prototype.includes) {
-        Object.defineProperty(Array.prototype, 'includes', {    // eslint-disable-line prefer-reflect,no-extend-native
-            value: function (searchElement, fromIndex) {
-                // 1. Let O be ? ToObject(this value).
-                if (this == null) {
-                    throw new TypeError('"this" is null or not defined');
-                }
-
-                var o = Object(this);
-
-                // 2. Let len be ? ToLength(? Get(O, "length")).
-                var len = o.length >>> 0;
-
-                // 3. If len is 0, return false.
-                if (len === 0) {
-                    return false;
-                }
-
-                // 4. Let n be ? ToInteger(fromIndex).
-                //    (If fromIndex is undefined, this step produces the value 0.)
-                var n = fromIndex | 0;
-
-                // 5. If n ≥ 0, then
-                //  a. Let k be n.
-                // 6. Else n < 0,
-                //  a. Let k be len + n.
-                //  b. If k < 0, let k be 0.
-                var k = Math.max(n >= 0 ? n : len - Math.abs(n), 0);
-
-                function sameValueZero (x, y) {
-                    return x === y || (typeof x === 'number' && typeof y === 'number' && isNaN(x) && isNaN(y));
-                }
-
-                // 7. Repeat, while k < len
-                while (k < len) {
-                    // a. Let elementK be the result of ? Get(O, ! ToString(k)).
-                    // b. If SameValueZero(searchElement, elementK) is true, return true.
-                    // c. Increase k by 1.
-                    if (sameValueZero(o[k], searchElement)) {
-                        return true;
-                    }
-                    k += 1;
-                }
-
-                // 8. Return false
-                return false;
-            }
-        });
-    }
-
-
     var features = [
+        'Array.prototype.includes', // IE 11 - material-ui/Select
+        'Number.parseInt',          // IE 11
+        'Number.parseFloat',        // IE 11
         'Map',                      // IE 10
         'Set',                      // IE 10
         'requestAnimationFrame',    // IE  9
-        'Intl.~locale.en-CA',       // IE 10, Safari 9
+        'Intl.~locale.en-CA'        // IE 10, Safari 9
     ];
 
     function missingFeatures() {
-        return features.filter(function(f) { return !window[f.split('.')[0]] });
+        return features.filter(function (f) {
+            var a = f.split('.');
+            var c = a[a.length - 1];
+
+            switch(a[0]) {
+                case 'Number': return (typeof Number[c] !== 'function');
+                case 'Array': return (typeof Array.prototype[c] !== 'function');
+            }
+
+            return !window[a[0]];
+        });
     }
+
     var missing = missingFeatures();
 
     if (missing.length) {

Diff for: src/App.js

@@ -59,7 +59,6 @@ class App extends Component {
     constructor (props) {
         super(props);
         this.state = {
-            locale: locale,
             isAuthenticated: false
         };
     }

Diff for: src/index.js

@@ -1,6 +1,6 @@
 import React from 'react';
+import ReactDOM from 'react-dom';
 
 import App from './App';
-import ReactDOM from 'react-dom';
 
 ReactDOM.render((<App/>), document.getElementById('root'));