StackOverflow2013

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2013-08-28T14:57:36.700
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2013-08-28T15:13:36.847
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2013-08-28T15:13:36.847
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Here are additional answers to some likely questions: JavaScript only has two scopes: <ol> <li>Global Scope</li> <li>Function Scope</li> </ol> There is no block scope in JavaScript! All variables declared inside a scope are available as if they were all declared at the begin of that scope, due to variable hoisting. 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. e.g. <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> Actually, in this case, the variable or named function is not needed at all. Just assign an anonymous function to the object property directly: <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> Tools like JSLint or JSHint will help you improve your JavaScript code. 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>. Finally, the Mozilla Developer Network is a much better resource than W3Schools. 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.
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1. POJavaScript: Defining function inside function
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1. COThank you for detiled explanation, +1 specially for mentioning `Javascript` has no block scope
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