JavaScript: The Definitive Guide, Sixth Edition by David Flanagan

By David Flanagan

Due to the fact 1996, JavaScript: The Definitive consultant has been the bible for JavaScript programmers—a programmer's consultant and finished connection with the middle language and to the client-side JavaScript APIs outlined by way of net browsers. The sixth version covers HTML5 and ECMAScript five. Many chapters were thoroughly rewritten to carry them according to contemporary top net improvement practices. New chapters during this version rfile jQuery and server part JavaScript. it really is urged for skilled programmers who are looking to research the programming language of the internet, and for present JavaScript programmers who are looking to grasp it. "A must-have reference for specialist JavaScript programmers...well-organized and detailed." --Brendan Eich, writer of JavaScript, CTO of Mozilla "I made a profession of what I discovered from JavaScript: The Definitive Guide.” -- Andrew Hedges, Tapulous

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9) The initial properties of the global object are not reserved words, but they deserve to be treated as if they are. 1 lists each of these properties. This chapter has already described some of these global properties. Most of the others will be covered elsewhere in this book. And you can look them all up by name in the core JavaScript reference section, or look up the global object itself under the name “Global”. For client-side JavaScript, the Window object defines other globals that you can look up in the clientside reference section.

Operator performs the Boolean NOT operation: it evaluates to true if its operand is falsy and evaluates to false if its operand is truthy. 10. 4 null and undefined null is a language keyword that evaluates to a special value that is usually used to indicate the absence of a value. Using the typeof operator on null returns the string “object”, indicating that null can be thought of as a special object value that indicates “no object”. In practice, however, null is typically regarded as the sole member of its own type, and it can be used to indicate “no value” for numbers and strings as well as objects.

Variables are declared with the var keyword. JavaScript uses lexical scoping. Variables declared outside of a function are global variables and are visible everywhere in a JavaScript program. Variables declared inside a function have function scope and are visible only to code that appears inside that function. 10. 1 Numbers Unlike many languages, JavaScript does not make a distinction between integer values and floating-point values. All numbers in JavaScript are represented as floating-point values.

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JavaScript: The Definitive Guide, Sixth Edition by David Flanagan
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