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Add toString example

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	`1`	`+<!DOCTYPE html>`
	`2`	`+<html lang="en">`
	`3`	`+<head>`
	`4`	`+ <meta charset="utf-8">`
	`5`	`+ <title>toString 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>toString</code> Example</h1>`
	`11`	`+ <p>Open your console to see this program’s output from the file <a href="toString.js">toString.js</a></p>`
	`12`	`+ <script src="toString.js"></script>`
	`13`	`+</body>`
	`14`	`+</html>`

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	`1`	`+/jslint es6, single, devel, this /`
	`2`	`+/eslint no-console: ["error", { allow: ["log"] }] /`
	`3`	`+`
	`4`	`+'use strict';`
	`5`	`+`
	`6`	`+`
	`7`	`+let dog = {`
	`8`	`+ adoptable: true,`
	`9`	`+ vaccinated: false`
	`10`	`+};`
	`11`	`+`
	`12`	`+console.log(dog.toString()); // [object Object]`
	`13`	`+`
	`14`	`+// Over-ride the inherited toString method in the prototype`
	`15`	`+dog.toString = function () {`
	`16`	+ let output = `This dog is `;
	`17`	`+`
	`18`	+ output += ((this.adoptable) ? `adoptable ` : `not adoptable `);
	`19`	+ output += ((this.vaccinated) ? `and vaccinated.` : `and not vaccinated.`);
	`20`	`+`
	`21`	`+ return output;`
	`22`	`+};`
	`23`	`+`
	`24`	`+// This dog is adoptable and not vaccinated.`
	`25`	`+console.log(dog.toString());`
	`26`	`+`
	`27`	`+// true, because toString shadows the inherited prototype method for toString`
	`28`	+console.log(dog.hasOwnProperty(`toString`));

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