MASTERING JAVASCRIPT PDF

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Welcome to Mastering JavaScript High Performance. In this book . We also provide you a PDF file that has color images of the screenshots/diagrams used in . Mastering JavaScript provides you with a detailed overview of the language's . We also provide you with a PDF file that has color images of the screenshots/. Download a free copy of Mastering JavaScript High Performance a page eBook from Packt, available in PDF, ePun and Mobi. Become an expert in.


Mastering Javascript Pdf

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Jonathan Boccara. Marwan Alshawi. Windows Kernel Programming. Pavel Yosifovich. Software Architecture for Developers: If you have elements in an array and set the length to 50, Javascript will truncate the last 50 elements from the array effectively deleting them. If you have 10 elements in an array and set Array. Javascript Does Not Support Associative Arrays An associative array is an array which uses a string instead of a number as an index.

However All arrays in Javascript are objects and Javascript's object syntax gives a basic emulation of an associative Array. For this reason the example code above will actually work.

Be warned that this is not a real array and it has real pitfalls if you try to use it. The 'person' element in the example becomes part of the Array object's properties and methods, just like. The loop in the above example will also pick up any methods, properties, and prototypes which have been added to the array and not just your data.

A lot of problems people have with the Prototype framework is that their associative arrays break because Prototype adds a few useful functions to the global object and for i in x loops pick up those additional methods. The bottom line is -- don't try to use associative arrays. Code for what they are -- object properties, not Arrays.

Free PDF eBook: Mastering JavaScript High Performance

What's really interesting is that some of these methods implement basic data structures you'd normally have to write yourself such as stacks push, pop and queues shift, unshift. Mastering Javascript Arrays Page 7 of 25 Array. The values passed to the concat method can be anything you can assign to a variable in Javascript.

Every value of the array is passed to that function until the function returns false. If no elements return false then every will return true, if an element returned false then every will return false.

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It's a convenient way to test an Array and see if every element is a number for instance. This method will pass the current value, the current index, and a pointer to the array to your function -- myfunction curValue, curIndex, curArray.

Simply copy the following code into your Javascript toolbox and the. In the Array. In Array. Here we pass the array through the same function as. All it does is pass each element of the Array to the passed function.Work through the examples, study the text and put your knowledge to work in your applications.

The 'person' element in the example becomes part of the Array object's properties and methods, just like. Write and Publish on Leanpub Authors, publishers and universities use Leanpub to publish amazing in-progress and completed books and courses, just like this one.

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If you had wanted to add more than one item then badArray would be initialized correctly since Javascript would then be smart enough to know that you were initializing the array instead of stating how many elements you wanted to add. Every value of the array is passed to that function until the function returns false.

Packt Publishing, Mastering Javascript Arrays Page 7 of 25 Array.

It provides everything you need to know about modern JavaScript, and teaches you what JavaScript can do for your web sites.

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