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Add propertyIsEnumerable example

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	`1`	`+<!DOCTYPE html>`
	`2`	`+<html lang="en">`
	`3`	`+<head>`
	`4`	`+ <meta charset="utf-8">`
	`5`	`+ <title>propertyIsEnumerable Example</title>`
	`6`	`+ <link rel="stylesheet" href="http://code-warrior.github.io/styles/reset.css">`
	`7`	`+ <link rel="stylesheet" href="http://code-warrior.github.io/styles/base.css">`
	`8`	`+</head>`
	`9`	`+<body>`
	`10`	`+ <h1><code>propertyIsEnumerable</code> Example</h1>`
	`11`	`+ <p>Open your console to see this program’s output from the file <a href="propertyIsEnumerable.js">propertyIsEnumerable.js</a></p>`
	`12`	`+ <script src="propertyIsEnumerable.js"></script>`
	`13`	`+</body>`
	`14`	`+</html>`

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	`1`	`+/jslint es6, single, devel, for /`
	`2`	`+/eslint no-console: ["error", { allow: ["log"] }] /`
	`3`	`+`
	`4`	`+'use strict';`
	`5`	`+`
	`6`	`+let dog = {`
	`7`	`+ adoptable: true,`
	`8`	`+ vaccinated: true`
	`9`	`+};`
	`10`	`+`
	`11`	+Object.defineProperty(dog, `name`, {
	`12`	+ value: `Spot`,
	`13`	`+ enumerable: false`
	`14`	`+});`
	`15`	`+`
	`16`	+console.log(dog.propertyIsEnumerable(`adoptable`)); // true
	`17`	+console.log(dog.propertyIsEnumerable(`vaccinated`)); // true
	`18`	+console.log(dog.propertyIsEnumerable(`name`)); // false
	`19`	+console.log(`Please adopt ${dog.name}. He’s...`);
	`20`	`+`
	`21`	`+for (let property in dog) {`
	`22`	+ console.log(`— ${property}`);
	`23`	`+}`

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