javascript conditional-statements

Flow Control
 Conditional statements are used to perform different actions
based on different conditions.
 In JavaScript we have the following conditional statements:
 If statement- use this too execute some code only if a
specified condition is true.
 If-else- use this to execute some code only if the condition is
true and another code if the condition is false.
 Switch statement-use this statement to select one of many
blocks of code to be executed.

If Statement
 Use this too execute some code only if a specified condition is true.
Syntax
if(condition)
{
code to be executed if condition is true
}

Example:
<script type=“text/javascript”>
//Write a “good morning” greeting if
//the time is less than 10
var d=new Date();
var time=d.getHours();
if(time<10)
{
document.write(“<b>Good morning</b>”);
}
</script>

If-else Statement
 Use this to execute some code only if the condition is true and another code if the
condition is false.
Syntax
if(condition)
{
code to be executed if condition is true.
}
else
{
code to be executed if condition is not true.
}

If-else Statement
 Example:
<script type=“text/javascript”>
//if time is less than 10 you will get a “Good morning” greeting.
//otherwise you will get a “Good day” greeting.

var d=new Date();
var time=d.get.Hours();

if(time<10)
{
document.write(“Good morning!”);
}
else
{
document.write(“Good day!”);
}
</script>

JavaScript Switch Statement
 Conditional statement are used to perform different actions based on different conditions.
The JavaScript Switch Statement
 Use the switch statement to select one of many blocks of code to be executed.
Syntax-
switch(n)
{
case 1:
execute code block 1
break;
case 1:
execute code block 1
break;
default;
code to be executed if n is different from case1 and case 2
}

JavaScript Switch Statement
<script type=“text/javascript>
/* you will receive a different greeting based on
What day it is. Note that Sunday=0,
Monday=1,Tuesday=2 etc. */

Var d=new Date();
theDay=d.getDay();
Switch(theDay)
{
Case 5:
document.write(“Finally Friday”); break;
Case 6:
document.write(“Super Saturday”); break;
Case 0:
document.write(“Sleepy Sunday”); break;
default;
document.write(“I m looking forward for this weekend!”);
}
</script>

javascript conditional-statements

javascript conditional-statements

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