By Robin Nixon

Master JavaScript in 20 lessons--online video tutorials included!

Based at the author's winning on-line classes, this entire, built-in studying device presents easy-to-follow classes that characteristic transparent motives, pattern code and workouts, and video tutorials. each one lesson is designed to take you lower than an hour to complete.

JavaScript: 20 classes to profitable internet Development covers the fundamentals, together with variables, operators, arrays, gadgets, and values. subsequent, you will how you can use conditional statements, paintings with multidimensional arrays, control gadgets, deal with mistakes, deal with cookies, use Ajax, and masses extra. jointly, the e-book and nearly 5 hours of video education make studying JavaScript more straightforward than ever!

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Extra resources for JavaScript: 20 Lessons to Successful Web Development

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All About Objects The JavaScript language is based on objects that are associative arrays. height) or with square brackets (for example, object[艂height艂]). Object properties can be enumerated using for(舰 in 舰) loops. In JavaScript, functions are themselves objects, so they have properties such as length and methods such as call(). This means they may also be assigned to variables, passed as arguments, and returned by other functions. Functions are referenced by naming them without parentheses (for example, a = funcname) orŠinvoked by adding the parentheses (for example, a = funcname()).

Your right to use the work may be terminated if you fail to comply with these terms. 舡 McGRAW-HILL EDUCATION AND ITS LICENSORS MAKE NO GUARANTEES OR WARRANTIES AS TO THE ACCURACY, ADEQUACY OR COMPLETENESS OF OR RESULTS TO BE OBTAINED FROM USING THE WORK, INCLUDING ANY INFORMATION THAT CAN BE ACCESSED THROUGH THE WORK VIA HYPERLINK OR OTHERWISE, AND EXPRESSLY DISCLAIM ANY WARRANTY, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

JavaScript will treat these as two totally different variables, so you need to be careful when choosing your variable names. Generally, I observe the following guidelines so that I can more easily go back and understand code I may have written in the past: ŠŠŠ舦ŠŠŠAll global variables that are accessible anywhere in a program are set to all uppercase, such as HIGHSCORE. ŠŠŠ舦ŠŠŠTemporary variables used in loops are single letters in lowercase, such as j. ŠŠŠ舦ŠŠŠFunction names use a capital letter at the start of each word, like this: MyFunctionName().

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