Ara Pehlivanian, Don Nguyen's Jump Start JavaScript PDF

By Ara Pehlivanian, Don Nguyen

Get a bounce commence on JavaScript today!

JavaScript is a key know-how in glossy internet improvement, allowing you to craft interactive, usable and interesting reviews in your users.

In only one weekend with this SitePoint e-book, you'll learn the way to:
• Use JavaScript to unravel actual international difficulties: construct kinds, tune person occasions and craft animations
• Use JavaScript with HTML5 and CSS3
• construct a complete JavaScript-powered software from scratch: a role administration application

Plus you'll detect how you can use glossy strategies corresponding to Canvas and Ajax.

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Additional resources for Jump Start JavaScript

Sample text

If you don’t, it will just output a comma-separated list of items. 4. Alert showing join in action Arrays You may be asking why a comma was passed in for that example when calling join by itself would have automatically inserted a comma. Notice how there's a space after the comma? 5. 5. Alert showing join in action without spacing slice slice will copy a part of an array and return it. Rather than modify the original array, it just makes a shallow copy. You tell it where to start and, optionally, where to end copying.

Reading from an Array Reading from an array is fairly straightforward. All you need to do is point to the item you want by its index number and the array will return it to you, like so: var myValue, myArray = ["Hello", "World", "I", "am", "an", "array"]; myValue = myArray[4]; // returns "an" 27 28 Jump Start JavaScript Here we have an array containing six items. Since arrays are zero-indexed, the word "Hello" resides at position 0, "World" is at 1, "I" is at 2, and so on. By passing the index 4 to myArray, we’re requesting the fifth item in the array, which is the word "an".

We’ll take a look at join shortly. Accessor Methods concat With concat, you can combine two or more arrays into one. The original arrays being concatenated remain untouched. concat(arr2, arr3); 35 36 Jump Start JavaScript // arr4 contains: // ["Pay phone bill", // "Write best-selling novel", // "walk the dog"] Here, the concat method has filled arr4 with the contents of the first three arrays. The other three arrays remain unchanged, each still containing one item. join We’ve already seen join in action in the unshift example.

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Jump Start JavaScript by Ara Pehlivanian, Don Nguyen


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