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JavaScript Switch Statement

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Conditional statements in the Java Script are used to perform different actions based on the different conditions.
A D V E R T I S E M E N T

switch Statement

A switch statement allows a program to evaluate an expression and attempt to match the expression's value to a case label. If a match is found, the program executes the associated statement. A switch statement looks as follows:

switch (expression)
{
case label_1:
statements_1
[break;]
case label_2:
statements_2
[break;]
...
default:
statements_def
[break;]
}


The program first looks for a case clause with a label matching the value of expression and then transfers control to that clause, executing the associated statements. If no matching label is found, the program looks for the optional default clause, and if found, transfers control to that clause, executing the associated statements. If no default clause is found, the program continues execution at the statement following the end of switch. By convention, the default clause is the last clause, but it does not need to be so.

The optional break statement associated with each case clause ensures that the program breaks out of switch once the matched statement is executed and continues execution at the statement following switch. If break is omitted, the program continues execution at the next statement in the switch statement.


Example:1

<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 to this weekend!")
}

</script>


Example:2

<script type="text/javascript">

switch (fruittype)
{
case "Oranges":
document.write("Oranges are $0.59 a pound.");
break;
case "Apples":
document.write("Apples are $0.32 a pound.");
break;
case "Bananas":
document.write("Bananas are $0.48 a pound.");
break;
case "Cherries":
document.write("Cherries are $3.00 a pound.");
break;
case "Mangoes":
case "Papayas":
document.write("Mangoes and papayas are $2.79 a pound.");
break;
default:
document.write("Sorry, we are out of " + fruittype + ".");
}
document.write("Is there anything else you'd like?");
</script>


In the following example, if fruittype evaluates to "Bananas", the program matches the value with case "Bananas" and executes the associated statement. When break is encountered, the program terminates switch and executes the statement following switch. If break were omitted, the statement for case "Cherries" would also be executed.

Example:3

<html>
<body>
<script type="text/javascript">
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 really looking forward to this weekend!")
}
</script>


Output

I'm really looking forward to this weekend!


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Keywords: javascript switch case, javascript switch statement, switch statement, javascript switch case statement

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