Advanced Javascript by Chuck Easttom

By Chuck Easttom

Complex JavaScript 3rd variation presents an in-depth exam of crucial positive factors of JavaScript. starting with an summary of JavaScript, the publication fast strikes into extra complex positive factors wanted for advanced but powerful JavaScript scripts, resembling items, arrays, and date and time services. also, numerous gains of JavaScript which are crucial for contemporary web content are mentioned, together with manipulating the prestige bar, growing dynamic calendars, and dealing with kinds, pictures, and the record item version. quite a few examples illustrate easy methods to enforce a number of innovations. subject matters lined: the best way to improve your websites with LED symptoms, banners, and pictures enforcing cookies to shop and retrieve info The constitution of the record item version and the way it may be used to view, entry, and alter an HTML record security features to guard inner most details whereas utilizing the web

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It makes no sense to write the current year as 02007, and, indeed, JavaScript will not evaluate it as 2007. Octal Integers Octal integers, also known as base-8 integers, use only eight digits: 0, 1, 2, 3, 4, 5, 6, 7. Octal digits are written with a leading 0 digit (that’s a zero, not the letter “o”). If you want to reference the octal integer 12 (equal to 10 in the decimal system), you would have to write it as 012. Chapter 3 Literals 28 n Chapter 3 Hexadecimal Integers Hexadecimal integers are commonly used in programming environments because each hexadecimal digit represents four binary bits.

As we begin to cover the basics of JavaScript, it is important to remember that it has many fundamental concepts in common with all programming languages, including its basic elements. So if you have worked with any other programming languages, this won’t be difficult to learn. It has variables that hold data, it has expressions or statements, and it has functions. These building blocks are used to construct your JavaScript script. I will explain each of these elements in this chapter. Data Types in JavaScript Variables hold information that usually must be of a specific type.

Take a look at the following expressions, numbered by line. /* /* /* /* /* /* 1 2 3 4 5 6 */ */ */ */ */ */ 8 + "8" 8 + "8" 8 + 8 + 8 + 8 "8" + "8" 8 + "8" "8" + 8 // // // // // // 16 "88" "88" "88" "168" "888" These expressions all use the string concatenation operator, which is also the numeric plus operator. ) The first expression simply adds up two numbers using a numeric format. It uses the standard plus operator and evaluates to the sum of its operands. The second expression is quite different.

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