WEEK 12

Question 1

The ___ are used to iterate the piece of code using for, while, do while or for-in loops. It makes the code compact. It is mostly
used in array.

Answer 1

JavaScript loops

Question 2

There are four types of loops in JavaScript.

Answer 2

• for loop
• while loop
• do-while loop
• for-in loop

Question 3

The ___ iterates the elements for the fixed number of times. It
should be used if number of iteration is known.

Answer 3

JavaScript for loop

Question 4

The ___ iterates the elements for the infinite number of times. It should be used if number of iteration is not known.

Answer 4

JavaScript while loop

Question 5

It iterates the elements for the infinite number of times like while loop. But, code is executed at least once whether condition is
true or false.

Answer 5

JavaScript do while loop

Question 6

___ are used to perform operations. We can call JavaScript
function many times to reuse the code.

Answer 6

JavaScript Functions

Question 7

Advantage of JavaScript function

Answer 7

1. Code reusability
2. Less coding

Question 8

We can call a function several times so it save coding.

Answer 8

Code reusability

Question 9

It makes our program compact. We don’t need to write many
lines of code each time to perform a common task.

Answer 9

Less coding

Question 10

We can call function by passing arguments.

Answer 10

JavaScript Function Arguments -

Question 11

We can call function that returns a value and use
it in our program.

Answer 11

Function with Return Value

Question 12

In JavaScript, the purpose of Function constructor is to create a new Function object. It executes the code globally.
However, if we call the constructor directly, a function is created dynamically but in an unsecured way.

Answer 12

JavaScript Function Object

Question 13

It represents the function definition.

Answer 13

functionBody

Question 14

It is used to call a function contains this value and a single array of arguments

Answer 14

apply ()

Question 15

It is used to create a new function.

Answer 15

bind()

Question 16

It is used to call a function contains this value and an argument list

Answer 16

call()

Question 17

It returns the result in form of a string

Answer 17

toString

Question 18

___ is an object that represents a collection of
similar type of elements.

Answer 18

JavaScript Array -

Question 18

There are 3 ways to construct array in JavaScript

Answer 18

1. JavaScript array literal
2. JavaScript Array directly (new keyword)
3. JavaScript array constructor (new keyword) -

Question 19

The syntax of creating array using array literal is
given as:

var arrayname=[value1,value2…..valueN];

As you can see, values are contained inside [ ] and separated by , (comma).

Answer 19

JavaScript array literal

Question 20

var arrayname=new Array();

Answer 20

JavaScript Array directly (new keyword)

Question 21

You need to create instance of array by passing arguments in constructor so that we don’t have to provide value explicitly.

Answer 21

JavaScript array constructor (new keyword)