JavaScript Statement

JavaScript Statement

JavaScript Supports The Following Types of the Statement

1. block Statement

2. break Statement

3. Continue Statement

4. do-While Statement

5. For Statement

6. For-in Statement

7. if-else Statement

8. return Statement

9. Switch Statement

10. Try..Catch Statement

11. While Statement

12. Comment Statement

1. block Statement

block statement is starts with the opening curly brace ( { ) and closed with

Closing curly brace ( } ) . We use block Statement when we wants to

Execute a set of Statement together or inside a one Loop.

Ex :
var x;
For(x=10;x<=20;x++)
{
    // Here, You Write your Own Code
}

function number(){
   // Your Function Code
}


2. break Statement

In JavaScript , The Function of the break Statement is Similar to the other

Programming Language Like C , C++ , Java etc. break Statement is used

To terminates the Set of Instructions , Conditions , and Different types of

Loop like for , While , do...While etc.

Ex :
var x;
for(x=0;x<10;x++)
{
if(x<5){
break;
 }
document.write("<h1> Example of break Statement </h1>");
}


3. Continue Statement

Continue Statement is used to bypass the loop so that it will not execute the

Same loop further and go to the next iteration.

Ex :

var i;
for(i=10;i<20;i++)
{
if(i<15){
continue;
 }
document.write("<h1> Example of Continue Statement </h1>");
}

4. do..While Statement

do..While Statement is the same as the Other loop Statement Like For , While

but only difference that do..While Statement is Execute at least one time

because in this Statement, condition is checked after the body part .

Syntax :
   // initialization Part
do
{
   // body Part
   // Changing Part
}
While(condition Part)

Ex :
var a=0;
do
{
document.write("do..While Loop" +a+ "<br/>");
a=a+2;
}
while(a<10);

5. For Statement

Every Loop Statement is Contains The Three Parts..

(A).  initialization Part

(B). Condition Part

(C). Changing Part

Syntax :

for( initialization ; Condition ; Changing )
{
// body Part
}

Ex :

var i;
For(i=20;i<=30;x=x+2)
{
    // Here, You Write your Own Code
}



6. For..in Statement

for..in Loop is Similar to the For..in Loop used in The Java. This Loop Execute

The code For all the items in loop or array . it will Take two parameters as

Argument

(A). variable For the Specified Array

(B). Specify The Array

Ex :

var Country=new Array("India" , " China" , "Pakistan" , "Sri lanka" , "Japan");
var name;
for (name in Country)
{
document.write(Country[name] + "<br/>");
}

7. if..else

This Condition Statement is used To Check the Condition . if Condition is True

it will execute the code inside the if loop Otherwise it will execute the condition

of the else loop. you can use a nested if..else loop also but nesting should be in

Proper Order.

Syntax :

if(Condition)
{
   // Code of if Loop
}
else
{
  // code of else Loop
}

Ex :

var x=24;
var y=35;
if(x>=y)
{
document.write("variable x is bigger than variable y");
}
else
{
document.write("variable y is bigger than variable x");
}


8. Return Statement

return statement is used to return the value from any function.

Ex :

function Addition (a,b)
{
return a+b;
}
var add=Addition(40,50);
document.write("Addition of the given two number is " + add);


9. Switch Statement

Switch Statement is the Replacement of the Long Nesting of the if..else ,

if..else Loop. it Evaluates argument Pass to it and Executes the

Corresponding Case Code . if Any Corresponding Case label not Found

Than it Will Execute the default Code.

Ex :
var browser="Chrome"
switch (browser)
{
case "Firefox" :
document.write(" Specified browser is Firefox");
break;


case "Chrome" :
document.write(" Specified browser is Chrome");
break;


case "Opera" :
document.write(" Specified browser is Opera");
break;

default :
document.write("Specified browser is not matched with the Firefox , chrome and Opera");
}



10. Try..Catch Statement

Similar to the try..catch block used in C++ , Java etc. it is used to handle

The Error of the Codes . Try block checks the Error and Throw it . if

Catch block finds the similar type of error , Specified as Argument , it

Will catch it and Execute the Corresponding Code. You Can Add a

Multiple Catch block also .

Ex : divide by Zero

var a=10;
var b=5;
var c=5;
try
{
var z=a/(b-c);
}
catch(e)
{
document.write("divide by Zero Error");
}


11. While Statement

While Statement is Execute The body Code if condition is true Otherwise

Terminates The Loop.

Syntax :

   // initialization Part
While(condition Part)

{
   // body Part
   // Changing Part
}


Ex :

var a=10;
while(a<10)
{
document.write("While Loop" +a+ "<br/>");
a=a+2;
}

12. Comment Statement

Comment Statement ( // ) is Used To Tell The JavaScript Browser that You

not Want to Execute This Line of Code in your Source Program so do not

Compile it.

Ex :

// var a;
// document.write("Comment Line Example");

Thank You To All My Reader
Deepak Gupta
www.i-world-tech.blogspot.in

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