JavaScript: A Beginners Guide (4th Edition) by John Pollock

By John Pollock

Fully up to date for the most recent JavaScript commonplace and that includes a brand new bankruptcy on HTML5 and jQuery

JavaScript: A Beginner's Guide indicates tips on how to create dynamic web content whole with lighting tricks utilizing today's best internet improvement language. With the expansion of HTML five, JavaScript is anticipated to develop much more to script the canvas aspect, upload drag and drop performance, and extra. This fast paced instructional presents step by step insurance of the basics, together with variables, services, operators, occasion handlers, items, arrays, strings, and kinds. The booklet then strikes to extra complicated ideas, together with debugging, accessibility, and protection. This pedagogically wealthy, hands-on advisor explains how JavaScript works with HTML five and covers the recent positive aspects to be had in JavaScript.

• Key abilities & recommendations: Chapter-opening lists of particular talents lined within the chapter
• Ask the specialist: Q & A sections jam-packed with bonus info and precious tips
• do this: Hands-on workouts that aid you follow your skills
• Notes: additional details concerning the subject being covered
• information: invaluable reminders or exchange methods of doing things
• Self-Tests: End-of-chapter studies to check your knowledge
• Annotated syntax: instance code with statement that describes the programming thoughts being illustrated
• Code downloads supplied for initiatives within the e-book

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If LENGTH is specified, that number of characters is substituted; otherwise, the rest of the string is returned. The first character is at offset 0: $ var=abcdefgh $ echo "${var:3:2}" de $ echo "${var:3}" defgh Shell Arithmetic In the Bourne shell, all arithmetic had to be done by an external command. For integer arithmetic, this was usually expr. The KornShell incorporated integer arithmetic into the shell itself, and it has been incorporated into the POSIX standard. The form is $(( expression )), and the standard arithmetic operators are supported: +, -, *, /, and %, for addition, subtraction, multiplication, division, and modulus (or remainder).

The form is $(( expression )), and the standard arithmetic operators are supported: +, -, *, /, and %, for addition, subtraction, multiplication, division, and modulus (or remainder). There are other operators, but they are not used in this book; your shell’s documentation will have all the details. The standard order of operator precedence that we remember from high school algebra applies here; multiplication and division are performed before addition and subtraction, unless the latter are grouped by parentheses: $ a=3 $ echo $(( $a + 4 * 12 )) 51 $ echo $(( ($a + 4) * 12 )) 84 The POSIX specification allows variables in arithmetic expressions to be used without a leading dollar sign, like this: echo $(( a + 4 )) instead of echo $(( $a + 4 )).

Which: Show the Full Path to a Command I have generally avoided which, partly because Bourne-type shells have the built-in type command, and partly because historically it was a csh script that did not work in a Bourne-type shell. In recent years, however, which is a compiled command on most systems and works with all shells. The advantage it has over type is that it prints only the path to the command; type's output is not standard, and usually includes more than just the path. gs, gv: Render, Convert, or View PostScript and PDF Files Ghostscript is used by several commands to render PostScript programs; I rarely use it directly.

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