Initial commit

.gitignore

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+.DS_Store
+node_modules/

.npmignore

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+.DS_Store
+node_modules/
+test/
+.travis.yml
+testling.html

.travis.yml

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+language: node_js
+node_js:
+	- "0.11"
+  - "0.10"
+  - "0.9"
+  - "0.8"
+  - "0.6"
+  - "0.4"
+before_install:
+  - '[ "${TRAVIS_NODE_VERSION}" == "0.6" ] || npm install -g npm@~1.4.6'
+matrix:
+  fast_finish: true
+  allow_failures:
+    - node_js: "0.11"
+    - node_js: "0.9"
+    - node_js: "0.6"
+    - node_js: "0.4"

LICENSE.md

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+The MIT License (MIT)
+
+Copyright (c) 2014 Leon de Rijke
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+## Relevant links
+
+* https://people.mozilla.org/~jorendorff/es6-draft.html#sec-number.isnan
+* http://wiki.ecmascript.org/doku.php?id=harmony:number.isnan
+* http://ariya.ofilabs.com/2014/05/the-curious-case-of-javascript-nan.html
+* http://www.2ality.com/2012/02/nan-infinity.html

isnan.js

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+if (!Number.isNaN) {
+	(function(global) {
+		var defineProperty = (function() {
+			// IE 8 only supports `Object.defineProperty` on DOM elements
+			try {
+				var object = {};
+				var $defineProperty = Object.defineProperty;
+				var result = $defineProperty(object, object, object) && $defineProperty;
+			} catch(error) {}
+			return result;
+		}());
+
+		var globalIsNaN = global.isNaN;
+
+		// Source: http://wiki.ecmascript.org/doku.php?id=harmony:number.isnan
+		var isNaN = function(value) {
+			return typeof value === 'number' && globalisNaN(value);
+		};
+
+		if (defineProperty) {
+			defineProperty(Number, 'isNaN', {
+				'value': isNaN,
+				'configurable': true,
+				'writable': true
+			});
+		} else {
+			Number.isNaN = isNaN;
+		}
+	}(this));
+}

package.json

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+{
+  "name": "Number.isNaN",
+  "version": "0.0.0",
+  "description": "A `Number.isNaN` polyfill, based on the ECMAScript 6 specification.",
+  "author": "Leon de Rijke",
+  "license": "MIT",
+  "keywords": [
+    "number",
+    "nan",
+    "es6",
+    "ecmascript",
+    "polyfill"
+  ],
+  "homepage": "https://github.com/leonderijke/Number.isNaN",
+  "bugs": {
+    "url": "https://github.com/leonderijke/Number.isNaN/issues"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/leonderijke/Number.isNaN.git"
+  },
+  "main": "isnan.js",
+  "scripts": {
+    "test": "mocha test/*.js"
+  },
+  "testling": {
+    "html": "testling.html",
+    "browsers": [
+      "iexplore/9.0..latest",
+      "firefox/10.0",
+      "firefox/17.0",
+      "firefox/22.0..latest",
+      "firefox/nightly",
+      "chrome/25.0..latest",
+      "chrome/canary",
+      "safari/5.0.5..latest",
+      "ipad/6.0..latest",
+      "iphone/6.0..latest",
+      "opera/12.0..latest",
+      "android-browser/4.2..latest"
+    ]
+  },
+  "devDependencies": {
+    "chai": "^1.9.1",
+    "es5-shim": "^3.3.2",
+    "mocha": "^1.19.0"
+  }
+}

test/test.js

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+var expect = require('chai').expect;
+
+require('../');
+
+// Tests taken from the es6-shim test cases
+// Source: https://github.com/paulmillr/es6-shim/blob/master/test/number.js
+describe('Number', function() {
+	var integers = [5295, -5295, -9007199254740991, 9007199254740991, 0, -0];
+	var nonIntegers = [-9007199254741992, 9007199254741992, 5.9];
+	var nonNumbers = [undefined, true, null, {}, [], 'str'];
+	var expectToBeOk = function(item) {
+		expect(item).to.be.ok;
+	};
+	var expectToNotBeOk = function(item) {
+		expect(item).to.not.be.ok;
+	};
+
+	describe('Number.isNaN()', function() {
+		it('should be truthy only on NaN', function() {
+			integers.concat(nonIntegers).map(Number.isNaN).forEach(expectToNotBeOk);
+			nonNumbers.map(Number.isNaN).forEach(expectToNotBeOk);
+			expect(Number.isNaN(NaN)).to.be.ok;
+			expect(Number.isNaN(0/0)).to.be.ok;
+			expect(Number.isNaN(Number('NaN'))).to.be.ok;
+			expect(Number.isNaN(4)).to.not.be.ok;
+			expect(Number.isNaN(4.5)).to.not.be.ok;
+			expect(Number.isNaN('hi')).to.not.be.ok;
+			expect(Number.isNaN('1.3')).to.not.be.ok;
+			expect(Number.isNaN('51')).to.not.be.ok;
+			expect(Number.isNaN(0)).to.not.be.ok;
+			expect(Number.isNaN(-0)).to.not.be.ok;
+			expect(Number.isNaN({valueOf: function() { return 3; }})).to.not.be.ok;
+			expect(Number.isNaN({valueOf: function() { return 0/0; }})).to.not.be.ok;
+			expect(Number.isNaN({valueOf: function() { throw 17; } })).to.not.be.ok;
+			expect(Number.isNaN({toString: function() { throw 17; } })).to.not.be.ok;
+			expect(Number.isNaN({
+				valueOf: function() { throw 17; },
+				toString: function() { throw 42; }
+			})).to.not.be.ok;
+		});
+	});
+});

testling.html

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+<!doctype html>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Number.isNaN tests</title>
+  <script src="node_modules/es5-shim/es5-sham.js"></script>
+  <script src="node_modules/mocha/mocha.js"></script>
+  <!-- note that chai uses Object.create() so needs es5-sham to be loaded -->
+  <script src="node_modules/chai/chai.js"></script>
+  <script>chai.config.includeStack=true; window.expect=chai.expect; window.assert=chai.assert; mocha.setup({ui:'bdd',reporter:'tap'});</script>
+  <script src="test/test.js"></script>
+  <script>mocha.run()</script>
+</head>
+<body>
+  <div id="mocha"></div>
+</body>
+</html>