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6
•

What is Functions defined)
A group of statements that is put together (or

once and then can be used (by reference) repeatedly on
a Web page
• Also known as subprogram, procedure, subroutine
• A function is written as a code block (inside curly { }
braces), preceded by the function keyword
• Syntax js function
– function functionname()
{
some code to be executed
}
– alert("message")
– confirm("message")
– prompt("message")
Most read
8
Example
•

<html>
<head>
<title>Assignment-2</title>
</head>
<script>
function date()
{
var d=new Date();
document.write(d);
}
</script>
<body>
<p>Press the button to show current date & time... </p>
<input type="button" onclick="date()" value="Show date">
</body>
</html>
Most read
9
Function Defnitions
•
•

•

Format of a function definition
function function-name( parameter-list )
{
declarations and statements
}
– Function name any valid identifier
– Parameter list names of variables that will receive arguments
• Must have same number as function call
• May be empty
– Declarations and statements
• Function body (“block” of code)
Return statement
– Optional , can return either nothing, or a value

– This is required if you want to return a value from a function
Most read
Functions in javascript
Disclaimer: This presentation is prepared by trainees of
baabtra as a part of mentoring program. This is not official
document of baabtra –Mentoring Partner
Baabtra-Mentoring Partner is the mentoring division of baabte System Technologies Pvt .
Ltd
Typing Speed
Week

Target Achieved

1

40

21

2

40

23

3

40

27
Jobs Applied
Week

Company

Designation

Applied Date

Current Status

1

Advent
software

Sr. Application Engineer

26-8-2013

Short listed

2

Alcatel-lucent

Software Engineer

28-8-2013

Waiting

3
Functions in Javascript
Muhammed Noufal V T
muhammednoufalvt@gmail.c
om
www.facebook.com/vtnoufa
lvt
twitter.com/noufalurnappy
in.linkedin.com/pub/muham
med-noufal
9744003056
•

What is Functions defined)
A group of statements that is put together (or

once and then can be used (by reference) repeatedly on
a Web page
• Also known as subprogram, procedure, subroutine
• A function is written as a code block (inside curly { }
braces), preceded by the function keyword
• Syntax js function
– function functionname()
{
some code to be executed
}
– alert("message")
– confirm("message")
– prompt("message")
Advantages of Functions
• Number of lines of code is reduced
• Code becomes easier to read &
understand
• Code becomes easier to maintain as
changes need to be made only at a
single location instead multiple
Example
•

<html>
<head>
<title>Assignment-2</title>
</head>
<script>
function date()
{
var d=new Date();
document.write(d);
}
</script>
<body>
<p>Press the button to show current date & time... </p>
<input type="button" onclick="date()" value="Show date">
</body>
</html>
Function Defnitions
•
•

•

Format of a function definition
function function-name( parameter-list )
{
declarations and statements
}
– Function name any valid identifier
– Parameter list names of variables that will receive arguments
• Must have same number as function call
• May be empty
– Declarations and statements
• Function body (“block” of code)
Return statement
– Optional , can return either nothing, or a value

– This is required if you want to return a value from a function
Function Parameters
• Facility to pass different parameters
while calling a function
• Passed parameters can be captured
inside the function and any
manipulation can be done over those
parameters
• A function can take multiple
parameters separated by comma.
• Parameters define the interface
between the function and the rest of
• <html>

Example

<head>
<script type="text/javascript">
function say(name, age)
{
alert( "I am" + name + age + " years old.");
}
</script>
</head>
<body>
<p>Click the following button to Know about my self</p>
<form>
<input type="button" onclick="say('Baabtra', 2)" value="Myself">
</form>
</body>
</html>
Local and Global variable
• A variable declared (using var) within a
JavaScript function becomes LOCAL and can
only be accessed from within that function
Contact Us
Emarald Mall (Big Bazar Building)
Mavoor Road, Kozhikode,
Kerala, India.
Ph: + 91 – 495 40 25 550

Start up Village
Eranakulam,
Kerala, India.
Email: info@baabtra.com

NC Complex, Near Bus Stand
Mukkam, Kozhikode,
Kerala, India.
Ph: + 91 – 495 40 25 550

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Functions in javascript

  • 2. Disclaimer: This presentation is prepared by trainees of baabtra as a part of mentoring program. This is not official document of baabtra –Mentoring Partner Baabtra-Mentoring Partner is the mentoring division of baabte System Technologies Pvt . Ltd
  • 4. Jobs Applied Week Company Designation Applied Date Current Status 1 Advent software Sr. Application Engineer 26-8-2013 Short listed 2 Alcatel-lucent Software Engineer 28-8-2013 Waiting 3
  • 5. Functions in Javascript Muhammed Noufal V T [email protected] om www.facebook.com/vtnoufa lvt twitter.com/noufalurnappy in.linkedin.com/pub/muham med-noufal 9744003056
  • 6. • What is Functions defined) A group of statements that is put together (or once and then can be used (by reference) repeatedly on a Web page • Also known as subprogram, procedure, subroutine • A function is written as a code block (inside curly { } braces), preceded by the function keyword • Syntax js function – function functionname() { some code to be executed } – alert("message") – confirm("message") – prompt("message")
  • 7. Advantages of Functions • Number of lines of code is reduced • Code becomes easier to read & understand • Code becomes easier to maintain as changes need to be made only at a single location instead multiple
  • 8. Example • <html> <head> <title>Assignment-2</title> </head> <script> function date() { var d=new Date(); document.write(d); } </script> <body> <p>Press the button to show current date & time... </p> <input type="button" onclick="date()" value="Show date"> </body> </html>
  • 9. Function Defnitions • • • Format of a function definition function function-name( parameter-list ) { declarations and statements } – Function name any valid identifier – Parameter list names of variables that will receive arguments • Must have same number as function call • May be empty – Declarations and statements • Function body (“block” of code) Return statement – Optional , can return either nothing, or a value – This is required if you want to return a value from a function
  • 10. Function Parameters • Facility to pass different parameters while calling a function • Passed parameters can be captured inside the function and any manipulation can be done over those parameters • A function can take multiple parameters separated by comma. • Parameters define the interface between the function and the rest of
  • 11. • <html> Example <head> <script type="text/javascript"> function say(name, age) { alert( "I am" + name + age + " years old."); } </script> </head> <body> <p>Click the following button to Know about my self</p> <form> <input type="button" onclick="say('Baabtra', 2)" value="Myself"> </form> </body> </html>
  • 12. Local and Global variable • A variable declared (using var) within a JavaScript function becomes LOCAL and can only be accessed from within that function
  • 13. Contact Us Emarald Mall (Big Bazar Building) Mavoor Road, Kozhikode, Kerala, India. Ph: + 91 – 495 40 25 550 Start up Village Eranakulam, Kerala, India. Email: [email protected] NC Complex, Near Bus Stand Mukkam, Kozhikode, Kerala, India. Ph: + 91 – 495 40 25 550