Javascript

Download Making Use of JavaScript by Shweta Bhasin PDF

By Shweta Bhasin

JavaScript is a flexible language that may be used to augment client-side and server-side scripting. JavaScript can be popular for its skills to control person enter, convey textual content, play sounds, demonstrate pictures, and converse with a plug-in response.* JavaScript, not like many different programming languages, is comparatively effortless to grasp, even in the event you don't have any programming event* Mastery of JavaScript permits internet masters and site builders to simply upload interactivity, relocating past static HTML pages

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Making Use of JavaScript

JavaScript is a flexible language that may be used to augment client-side and server-side scripting. JavaScript is usually typical for its talents to control person enter, convey textual content, play sounds, exhibit photographs, and converse with a plug-in reaction. * JavaScript, not like many different programming languages, is comparatively effortless to grasp, even in case you don't have any programming event* Mastery of JavaScript permits internet masters and site builders to simply upload interactivity, relocating past static HTML pages

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1 lists the keywords in JavaScript that are part of the language syntax. This means that they should not be used as identifiers. Note An identifier is a name assigned to some program element, such as a variable or a function. 2 lists keywords from Java. Although JavaScript does not currently use any of these keywords, you should avoid using these in your program. 3 lists other identifiers that you should avoid using. While these identifiers are not strictly reserved, they are the names of the data types, functions, and variables that are predefined by client−side JavaScript.

While studying, most of us wrote notes so that we could refer to them quickly at the time of our exams. We were simply storing information and retrieving it later. In the same manner, while programming, we need to store values or information for later reference. We store such values in variables. The type of data that we store in a variable is referred to as a data type and the value that we assign to a variable is called a literal value. Let’s now discuss the methods of storing information in a variable and the relevance of expressions and operators.

49 If an unassigned variable is declared without using the var keyword, the evaluation results in a run−time error. Consider the following example, where variable x is used in a function without being declared: function evalSubtraction(){ return x*32; } evalSubtraction() //causes runtime error If an unassigned variable is declared using the var keyword, its evaluation results in the undefined value for strings, NaN (Not a Number) for the number type, and false for the Boolean type. The following example returns the NaN value when an unassigned variable, which is declared using the var keyword, is used: function evalSubtraction(){ return var x*32; } evalSubtraction() //returns NaN The literal value, undefined, can also be used to determine whether a variable holds a value.

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