Functions in javascript
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The document provides information about a mentoring program run by Baabtra-Mentoring Partner including a trainee's typing speed progress over 3 weeks, jobs applied to with current statuses, an introduction to functions in Javascript covering definitions, advantages, examples, and local and global variables. Contact details for Baabtra are also provided at the end.
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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 muhammednoufalvt@gmail.c 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: info@baabtra.com NC Complex, Near Bus Stand Mukkam, Kozhikode, Kerala, India. Ph: + 91 – 495 40 25 550