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copied!<p>Here are additional answers to some likely questions:</p> <p>JavaScript only has two scopes:</p> <ol> <li><p>Global Scope</p></li> <li><p>Function Scope</p></li> </ol> <p>There is <strong>no block scope</strong> in JavaScript!</p> <p>All variables declared inside a scope are available as if they were all declared at the begin of that scope, due to <strong>variable hoisting</strong>.</p> <p>This is why it is recommended to declare all variable at the begin of their scope, to better reflect reality, possibly in a single var declaration.</p> <p>e.g.</p> <pre><code>function person(firstname, lastname, age, eyecolor) { var changeName = function (name) { this.lastname = name; } this.firstname = firstname; this.lastname = lastname; this.age = age; this.eyecolor = eyecolor; this.changeName = changeName; } </code></pre> <p>Actually, in this case, the variable or named function is not needed at all.</p> <p>Just assign an anonymous function to the object property directly:</p> <pre><code>function person(firstname, lastname, age, eyecolor) { this.firstname = firstname; this.lastname = lastname; this.age = age; this.eyecolor = eyecolor; this.changeName = function (name) { this.lastname = name; } } </code></pre> <p>Tools like JSLint or JSHint will help you improve your JavaScript code.</p> <p>See <a href="http://codepen.io/anon/pen/bEJFn" rel="nofollow">this sample @ codepen.io</a> (press CTRL+SHIFT+7 in the JS Editor) and <a href="http://blog.codepen.io/2013/06/11/inline-error-messaging-for-js-hint/" rel="nofollow">JSHint use at codepen.io</a>.</p> <p>Finally, the Mozilla Developer Network is a much better resource than W3Schools.</p> <p>It will even teach you in the <a href="https://developer.mozilla.org/en-US/docs/Web/API/document.write#Notes" rel="nofollow">document.write Notes</a> that is not good practice.</p>

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