Basics of Coding

Question 1

What is JavaScript?

Answer 1

A scripting language you can use to make web pages interactive. It is one of the core technologies of the web, along with HTML and CSS, and is supported by all modern browsers.

Question 2

Data

Answer 2

Data is anything that is meaningful to the computer.

Question 3

What are the eight different data types in Javascript?

Answer 3

1. undefined,
2. null,
3. boolean
4. string
5. symbol,
6. bigint,
7. number
8. object.

Question 4

Define the datatypes?

Answer 4

1. undefined = Never defined
2. null = Defined as nothing
3. boolean = Logical entity and can have two values: true and false
4. string = Collection of Characters (Text)
5. symbol =
6. bigint = numeric primitive in JavaScript that can represent integers with arbitrary precision.
7. number = integers
8. object = complex data type that allows you to store collections of data

Question 5

What are variables?

Answer 5

Variables are containers for storing data (storing data values).

Question 6

What is HTML and CSS?

Answer 6

HTML (HyperText Markup Language) is the contents of the page (links, text)

CSS (Cascading Style Sheets) is the design of the page (color)

Question 7

True of False? Initialization means of assigning an initial value to a variable

Answer 7

TRUE

Question 8

What happens when you dont initialize in Javascript?

Answer 8

If we just declare a variable without assigning an initial value, the value of the variable will be undefined

Question 9

String vs String Literal

Question 10

True of False : When JavaScript variables are declared, they have an initial value of undefined. If you do a mathematical operation on an undefined variable your result will be NaN which means “Not a Number”.

Answer 10

TRUE

Question 11

What does Concatenation mean?

Answer 11

the operation of joining two strings together

Question 12

Is Javascript case sensitive?

Answer 12

Yes!!! This means that capitalization matters.

Question 13

What is camelCase and why does in matter in Javascript?

Answer 13

The use of a capital letter to begin the second word in a compound name or phrase. E.g iPOD or FedEx
The most recommened way to declare JavaScript variables is with camel case variable names, it will ensure that there aren’t multiple variables with the same name.

Question 14

4 WAYS TO DECLARE VARIBLE?

Answer 14

1. Var
2. let
3. const.
4. nothing.

Question 15

TRUE OR FALSE? You should always name variables you don’t want to reassign using the const keyword

Answer 15

TRUE!!!

Question 16

TRUE OR FALSE :Decimal numbers are sometimes referred to as floating point numbers or floats.

Answer 16

TRUE

Question 17

Different ways to add/subtract/divide/multiply on Javascript:

Answer 17

(a) let a = 5;
a = a+1;
(b) let a = 5;
a += 5;

Question 18

2 Reasons to use escape characters?

Answer 18

To allow you to use characters you may not otherwise be able to type out, such as a carriage return.
To allow you to represent multiple quotes in a string without JavaScript misinterpreting what you mean.

Question 19

Bracket Rotation

Answer 19

The first character is actually the zeroth character.