An introduction to lambda calculus - download pdf or read online

By Barendregt & Barendsen

ISBN-10: 1280249870

ISBN-13: 9781280249877

ISBN-10: 8132317033

ISBN-13: 9788132317036

This ebook presents a accomplished creation to Lambda Calculus.

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The DOM of the page after executing the JavaScript code contained in the script element Event handling 23 This is followed by a call to the addMessage function addMessage(first, "Page loading"); which causes the creation of a new li element, the modification of its text content, and finally its insertion into the DOM. In this example, the JavaScript code modifies the current DOM by creating a new element and inserting it into the DOM. But in general, JavaScript code can modify the DOM to any degree: It can create new nodes and modify or remove existing DOM nodes.

We’ll certainly be paying plenty of attention to objects in part 3 of the book, but when it comes down to brass tacks, the main difference between writing JavaScript code like the average Jill (or Joe) and writing it like a JavaScript ninja is understanding JavaScript as a functional language. The level of sophistication of all the code you’ll ever write in JavaScript hinges on this realization. If you’re reading this book, you’re not a rank beginner. We’re assuming that you know enough object fundamentals to get by (and we’ll be taking a look at 33 34 CHAPTER 3 First-class functions for the novice: definitions and arguments more-advanced object concepts in chapter 7), but really understanding functions in JavaScript is the single most important weapon you can wield.

The processing that’s necessary to determine when events have occurred and that pushes them onto the event queue doesn’t participate in the thread that’s handling the events. EVENTS ARE ASYNCHRONOUS Events, when they happen, can occur at unpredictable times and in an unpredictable order (it’s tricky to force users to press keys or click in some particular order). We say that the handling of events, and therefore the invocation of their handling functions, is asynchronous. The following types of events can occur, among others: ■ ■ ■ ■ Browser events, such as when a page is finished loading or when it’s to be unloaded Network events, such as responses coming from the server (Ajax events, serverside events) User events, such as mouse clicks, mouse moves, and key presses Timer events, such as when a timeout expires or an interval fires The vast majority of code executes as a result of such events!

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An introduction to lambda calculus by Barendregt & Barendsen

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