Chapter 9 : JavaScript Part 2

Question 1

How to declare function?

Answer 1

function name ( parameter1, parameter2, parameter3 )
{
statement;
}

• parameters
  
  • names listed in the function definition
    arguments
  • real values received by the function when it is invoked

Question 2

What does the argument behaves inside the function?

Answer 2

1. Behave as local variables

Question 3

What does the function will do when it reaches a return statement?

Answer 3

1. Stop executing the function and return the value in the return statement

• The return value is returned back to the caller

Question 4

Write a function which times both parameter p1 and p2 and return the results

Answer 4

<script>
function returnProduct (p1, p2)
{
     return p1*p2
}

document.getElementById("demo").innerHTML = returnProduct(4,3);
</script>

<p><p>
</p></p>

Question 5

What is the advantages of using JavaScript functions?

Answer 5

1. Code Reusability
2. Use the same code with different arguments to generate different results

Question 6

What does the Date objects allows?

Answer 6

1. Lets us work with dates ( years, months, days, hours, minutes, seconds and milliseconds )

Question 7

List out the constructor for creating a date

Answer 7

1. new Date()

Question 8

List out 4 ways for initiating a date

Answer 8

1. new Date()
2. new Date(milliseconds)
3. new Date (dateString)
4. new Date (year, month, day, hours, minutes, seconds, mulliseconds )

Question 9

List out 4 formats for JavaScript date input formats

Answer 9

1. ISO Date
   
   • “2015-03-25”
2. Short Date
   
   • “03/25/2015”
3. Long Date
   
   • “Mar 15 2015”
   • “25 Mar 2015”
4. Full Date
   
   • “Wednesday March 25 2015”

Question 10

What date format is used for date record?

Answer 10

1. ISO Date

Question 11

List out 10 date methods

Answer 11

1. getDate()
2. getDay()
3. getFullYear()
4. getHours()
5. getMiliseconds()
6. getMinutes()
7. getMonth()
8. getSeconds()
9. getTime()

Question 12

What does getDate does?

Answer 12

1. Get the day number from 1 to 31

Question 13

What does getDay does?

Answer 13

1. Get the weekday as number from 0 to 6

0 - Monday
1 - Tuesday
.
.
6 - Sunday

Question 14

What does getFullYear() does?

Answer 14

1. Get the four digit year (YYYY)

Question 15

What does getHours() does?

Answer 15

1. Get the hours ( 0 - 23 )

Question 16

What does getMilliseconds() does?

Answer 16

1. Get milliseconds ( 0 - 999 )

Question 17

What does getMinutes() does?

Answer 17

1. Get minutes ( 0 - 59 )

Question 18

What does getMonth() does?

Answer 18

1. Get month ( 0 - 11 )

Question 19

What does getSeconds() does?

Answer 19

1. Get seconds ( 0 - 59 )

Question 20

What does getTime() does?

Answer 20

1. Get time ( Milliseconds since January 1, 1970 )

Question 21

List out conditional statements for JavaScript ( 2 )

Answer 21

1. If Statement
2. Switch Statement

Question 22

How to write if, else if and else statement?

Answer 22

if ( condition1 )
{
statement;
}
else if ( condition2 )
{
statement;
}
else
{
statement;
}

Question 23

List out the syntax for switch statement

Answer 23

switch ( expression )
{
case n:
statment;
break
case n:
statment;
break
default:
statment;
break
}

Question 24

List out 4 types of loops

Answer 24

1. for
   
   • loops through a block of code a number of times
2. for / in
   
   • loops through the properties of an object
3. while
   
   • loops through a block of code while a specified condition is true
4. do/while
   
   • loops through a block of code once ( in the do section ) before checking the condition, if the condition is true , then it will repeat the loop again

Question 25

What loop is most often to use when we want to create a loop?

Answer 25

for ( statement1 ; statement2 ; statement3 )
{
statement;
}

Question 26

What is the syntax for while loop?

Answer 26

while ( condition )
{
statement;
}

Question 27

What is the syntax for do / while loop?

Answer 27

do
{
statement;
}
while ( condition ) ;