Web Programming - Week 2

Question 1

Advantages of JavaScript

Answer 1

Speed
Rich Interfaces
Increased Interactivity

Question 2

How to embed JavaScript

Answer 2

The HTML < script > tag in < head > or < body >

Question 3

Generating Output

Answer 3

innerHTML

window. alert()
document. write()
console. log()
window. print()

Question 4

Inputting a value

Answer 4

var name = window.prompt()

Question 5

Declaring variables

Answer 5

var
let
const

Question 6

Comment syntax

Answer 6

// - Single line
/* *\ - Multi line

Question 7

Return datatype of value

Answer 7

typeof variable

Question 8

Types of variable scopes

Answer 8

Global - Anywhere
Function - Only within function
Block - Only inside block with let keyword

Question 9

Arithmetic Operators

Answer 9

% Modulus
++ Increment
– Decrement

+= Adds to original value

Question 10

Relational Operators

Answer 10

=== equal value and equal type
!== not equal value or equal type

Question 11

Logical Operators

Answer 11

&& and
|| or
! not

Question 12

Conditional Statements

Answer 12

if (condition) {}
else if (condition) {}
else {}

Question 13

JavaScript Switch

Answer 13

switch (expression) {
case value1:
default:
}

If value1 = expression, then case
If no case applied, then default

Question 14

Conditional Ternary Operator

Answer 14

condition ? exprIfTrue: exprIfFalse

Question 15

Loops and Iteration

Answer 15

for ([inital]; [condition]; [expression]) {}
for...in
for...of
while (condition) {}
do...while

Question 16

Loop statements

Answer 16

Break jumps out of the loop

Continue jumps to the next loop iteration

Question 17

Function syntax

Answer 17

function name(parameter1, parameter2, etc..){}

Question 18

What does \ do

Answer 18

Turns special characters into string characters

Question 19

How to make a function return a value

Answer 19

return value;

Question 20

How to refer to an element

Answer 20

document.GetElementById(“ElementID”)