Learning JavaScript tutorial – JavaScript Statements

A JavaScript program is simply a sequence of one or more JavaScript statements. JavaScript Statements is used to define the logic to make something happen. A statement can be used to declare a variable and assign a value. A statement can also be a function call, i.e. document.write(). JavaScript Statements are separated from each other with semicolons. The semicolon is optional in JavaScript, if you place each JavaScript statement on a separate line, JavaScript allows us to leave out the semicolons. The best practice of defining JavaScript Statements is to use semicolons, everywhere at the end of the each JavaScript statement.

JavaScript Statement Blocks

JavaScript Statement Block use Curly braces – {} to group a series of JavaScript Statements together to perform some sort of operation repeatedly or once based on desire condition. Whenever a JavaScript Statement Block occurs in JavaScript program is treated as a single statement. JavaScript Statement Block plays an important role while dealing with Conditional and Loop Statements.

<script type="text/javascript">
var iCount=0;
var iSum=0;
while(iCount<=5){
 iSum=iSum+iCount;
 iCount++;
}
alert(iSum); //alert 15
</script>

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Learning JavaScript tutorial – JavaScript Operator Precedence and Associativity

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In our last article "Learning JavaScript tutorial – JavaScript Expressions and Operators", we take a look at JavaScript Operators. JavaScript Operators have a predefined order of precedence which are used to process and evaluate a JavaScript expression. JavaScript Operator Precedence is similar to the Mathematical Operator Precedence and Associativity. Like basic algebra Operator Precedence, JavaScript multiplication and division Operator have higher precedence over addition and subtraction Operator. For example:

alert(4 + 3 * 2);  // alert ’10′

Using parentheses, we can group expressions so that we can evaluate any JavaScript expressions in an order of our choice. For example:

alert(4 + 3 * 2);  // alert ’10′
alert((4 + 3) * 2); // alert ’14′
alert((4 / 2) * 2); // alert ’4′

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Working with System.DateTime – Date and Time String Formatting with C#

Software Development with C# needs to work with dates and times. To work efficiently with Date and Time .NET has the System.DateTime (DateTime) namespace to help us. You can use DateTime to get DateTime values, generate new DateTime values and format DateTime values (parse strings into DateTime or DateTime in the string format).

Creating New DateTime Objects with C#

The default value of DateTime is Jan 1, 0001 at 12:00 midnight.

DateTime newDate = new DateTime();
Console.WriteLine("date: {0}", newDate); //date: 1/1/0001 12:00:00 AM

Creating New DateTime through the constructor

You can initialize the DateTime through the constructor using several pre-define options.

System.DateTime newDate = new System.DateTime(2010, 9, 5, 21, 35, 15, 777);
Console.WriteLine("date: {0}", newDate);//date: 9/5/2010 9:35:15 PM

If you need the current date and time? DateTime.Now will do it for you.

System.DateTime newDate = System.DateTime.Now;
Console.WriteLine("date: {0}", newDate);// Current Date Time will be display

Date and Time String Formatting with C#

The date and time value can be represented by either a DateTime or a DateTimeOffset value. Date and Time String Formatting fall into two categories:

• Standard Date and Time String Formatting
• Custom Date and Time String Formatting

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Learning JavaScript tutorial – JavaScript Expressions and Operators

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JavaScript Expressions and Operators are very similar with most popular programming languages like C, C++, or Java. In this chapter we take an overview of the basic building blocks of JavaScript: operators, expressions.

JavaScript Expressions

JavaScript Expression is a combination of values, variables, operators, and functions that are interpreted (evaluated) as per the program logic define(develop) by JavaScript programmer. For example consider mathematical expression: 4+3 is an arithmetic and programming expression which evaluates to 7. The assignment expression x=4+3 also evaluates to 7 and assign that value to variable x. The expression is use to evaluate the the values for pre-define JavaScript program logic.

var intNum;  //Expression to declare a variable
var intNum=10; //Expression to declare a variable with assigned initial value
var x=5, y=4, z=x+y; //Expressions to declared multiple variables

JavaScript Operators

JavaScript supports a variety of operators like arithmetic, logical and comparison etc. An operator is a function which acts on any number of operands (inputs) to produce a pre-define operation.

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Learning JavaScript tutorial – JavaScript Reserved KeyWords

JavaScript Reserved KeyWords are part of the JavaScript language syntax. JavaScript Reserved KeyWords has special meanings and used to instruct JavaScript interpreter to perform a specific pre define task. JavaScript has some reserved keywords which can not be used as an identifier. Using JavaScript Reserved KeyWords as an identifier for variable names, function names, and loop labels results in error.

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