Download e-book for iPad: Beginning JavaScript with DOM Scripting and Ajax: From by Christian Heilmann

By Christian Heilmann

ISBN-10: 1590596803

ISBN-13: 9781590596807

The book's name means that it is a e-book for newbies in addition to skilled programmers, yet i would not suggest this ebook to somebody who's simply commencing to examine JavaScript until you recognize an identical scripting language. the 1st few chapters of the booklet clarify the fundamentals like facts varieties and variables, yet then the writer all at once begins throwing fairly lengthy examples of code on the reader that may certainly confuse an green programmer. He ends each one bankruptcy with "now you understand how to do that, and that" that is problematical simply because he does not make an effort to provide an explanation for every little thing and simply assumes that you're going to determine it out on your own. He additionally tells you to disregard a few components of code and tells you that it'll be defined later within the e-book, but when you're like me and will not commence a brand new bankruptcy till you've got thoroughly understood the present bankruptcy this is often going to irritate you. you're feeling kind of like you will have skipped a bankruptcy or and now cannot comprehend what the writer is conversing approximately. it kind of feels like he simply determined that it'd be more straightforward to only reduce and paste sizeable chunks of code to the publication and upload short and infrequently imprecise causes instead of take a extra conventional process. i'd suggest this e-book purely to those who be aware of JavaScript and wish to benefit new strategies and increase their abilities. while you're a newbie and simply commencing to study JavaScript purchase a "JavaScript for dummies" sort e-book and when you examine the fundamentals learn this booklet to enhance your wisdom of JavaScript.

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Extra info for Beginning JavaScript with DOM Scripting and Ajax: From Novice to Professional

Example text

Single quote. \" Double quote. \\ Backslash. \xNN NN is a hexadecimal number that identifies a character in the Latin-1 character set (the Latin-1 character is the norm for English-speaking countries). \uDDDD DDDD is a hexadecimal number identifying a Unicode character. write( 'Paul\'s characters' ); The escape sequence tells the JavaScript interpreter that the single quotation mark belongs to the string itself and isn’t a delimiter. ASCII is a character encoding method that uses values from 0 to 254.

It parses the string character by character from left to right, until it encounters a character that can’t be used in a number. It then stops at that point and evaluates this string as a number. If the first character can’t be used in a number, the result is NaN (which stands for Not a Number). • parseInt(): Converts the value to an integer by removing any fractional part without rounding the number up or down. Anything nonnumerical passed to the function will be discarded. If the first character is not +, -, or a digit, the result is NaN.

You will see more of these when we discuss structures such as if or for, as well as functions. • A semicolon or a newline defines the end of a statement, and a statement is a single command. Semicolons are in fact optional, but it’s still a good idea to use them to make clear where statements end, because doing so makes your code easier to read and debug. ) You don’t need to use semicolons after curly braces. dtd">