Javascript

Question 1

Key steps for variables

Answer 1

declaration: let, var, const
assignment: age = 25

let age = 25

Question 2

variable conventions in Javascript is …

Answer 2

camelCase
eg. let numberOfApples = 9

Question 3

Strings

Answer 3

stores text, string is surrounded with quotes ( ‘ ‘, “”, ``)

Question 4

Numbers

Answer 4

Represent numerical data, integer or float (float means it has decimals)

Question 5

Logical Operators

Answer 5

== (comparing the value only if equal)
!= (not equal in value)
!== (not equal in value and type)
=== (strictly equal in value and type)

Question 6

Conditional Syntax

Answer 6

if ( condition is true) {
// do cool stuff
}

eg.

const pizza = “Dominos”

if (pizza === “Papa Johns”) {
console.log(“Scram”)
} else if(pizza === “Dominos”) {
console.log(“You got that right”)
} else {
console.log(“What you doing?”)
}

Question 7

Multiple Conditions

Answer 7

OR
if (day === “Saturday” || day === “Sunday”) {
//it is the weekend.
}

AND
if (day === “Saturday” && day === “Sunday”) {
//it is the weekend.
}

Question 8

Example of a Function Declaration

Answer 8

function sayHi() {
alert(‘Hello’)
}

Question 9

Example of a Function Expression

Answer 9

let sayHi = function() {
alert(‘Hello’);
};

Question 10

Example of an Arrow Function

Answer 10

sayHi = () => alert(‘Hello’);

Question 11

What is a while loop?

Answer 11

A while loop lets you repeat a code while a certain condition is true.

The while loop repeats statements while a certain condition is true.

Question 12

Example of a while loop

Answer 12

let number = 1;
while (number <= 5) {
console.log(number);
number++;
}

Question 13

What is the while loop syntax?

Answer 13

while(condition) {

//this is called the body
// Code to run while the condition is true

}

Question 14

What is an example of for loop?

Answer 14

let number;
for (number =1; number <= 5; number++) {
console.log(number);
}

Question 15

What is the for loop syntax?

Answer 15

for (initialization; condition; final expression) {

// code to run while the condition is true

}

Question 16

What is the meaning of initialization on for loop?

Answer 16

Initialization only happens once, when the code first kicks off. It’s often used to set the initial value of the variable associated to the loop condition.

Question 17

What is the meaning of the condition on for loop?

Answer 17

The condition is evaluated once before the loop runs each time. If it’s true, the code runs. If not, the code doesn’t run.

The for loop gives the ability to manage what happens just before the loop starts and after each loop iteration has run.

Question 18

What is the meaning of the final expression on for loop?

Answer 18

The final expression is evaluated after the loop runs each time. It’s often used to update the value of the variable associated with the loop condition, as we saw in the previous example.

Question 19

What does iteration mean?

Answer 19

Each repetition in your code.

Question 20

What are loops used for?

Answer 20

It is used to repeat a series of statements.

Question 21

How to create a form in HTML?

Answer 21

<form>
<label> First Name:</label>
<input></input><br></br>
</form>

Question 22

Example of Javascript

Answer 22

HTML FILE

<h1>Your Name</h1>

<form>
<label>First Name</label>
<input></input>
</form>

<button>Yell</button>

<h2></h2>

JAVASCRIPT FILE

document.querySelector(‘#yell’).addEventListener(‘click’, yell)
function yell() {
const fName = document.querySelector(‘#firstName’).value;
const upperCaseName = fName.toUpperCase();
document.querySelector(‘#placeToYell’).innerText = upperCaseName;
}

Question 23

What are variables?

Answer 23

Are buckets.
We can tell our program to remember values for us to use later on.
The entity we use to store the value is called a variable