Introduction to JavaScript

Everything that can be written in JavaScript will be written in JavaScript.)

P.S. You'll get it soon enough...

JavaScript Data Types & Data Structures

Data Types ( Primitive )

Everything that's not a primitive datatype, is an Object in ...JavaScript!

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

Data Structures

Primitive

• Arrays ( list ) - Multidimensional array

• Objects ( map, dictionary, or hash-table ) - Key-Value pairs

Non-primitive

• Stacks

• Queues

• Linked lists

• Trees

• Graphs

• Roundup

Comparison Operators

• !== - !=

• === - ==

• >=

• <=

• >

• <

Variables

Variables are containers for storing data values

• var
• let ( ES6 )
• const ( ES6 )

Variable naming conventions

• camelCase: JavaScript

• CONSTANTS: Immutable, Shouldn't be modified...!

• snake_case: Python

• PascalCase: C/C++

Conditionals

• if
• else if
• else
• switch-case
• Ternary Operators ( ? : )

Logical Operators

• &&: and
• ||: or
• !: not!

Functions

A function() must return something

• const x = function name() {}
• function name() {}
• Arrow Functions ( ES6 ): () => {}

Loops

• for
• forEach ( ES6 )
• do
• while

Some Common Functions

• alert()

• prompt()

• clear()

• print(): Print the webpage, not like python...!

The adventures await...

Calculations with Numbers & Strings

3 + "6"

• "36"

9 - "6"

• 3

9 % 3

• 0

"Java" + "Script"

• "JavaScript"

" " + " "

• ''

" " + 0

• '0'

true + true

• 2

true + false

• 1

false + true

• 1

true - false

• 1

false - true

• -1

6 - 9

• -3

"Starboy" - "Sam"

• NaN

9 >= 6

• true

0 === 1

• false

9 <= 6

• false

0 !== 0

• false

"A" > "B"

• false

"B" < "C"

• true

"a" > "A"

• true

"b" < "A"

• false

true === false

• false

true != true

• false

Make a String

"Hi There! It's sunny out" by using the + sign.

• "Hi There! " + "It's "sunny" out"

Or, just use the '/" interchangeably...

JavaScript in a nutshell

Special Keywords

• break
• case
• catch
• class
• const
• continue
• debugger
• default
• delete
• do
• else
• export
• extends
• finally
• for
• function
• if
• import
• in
• instanceof
• new
• return
• super
• switch
• this
• throw
• try
• typeof
• var
• void
• while
• with
• yield

At last, Please don't confuse JavaScript with Java.)

P.S Get it?

Introduction to Vanilla "JavaScript".)

NOTE: Try to just NEVER write Vanilla, or you'll end up creating your own little JS Framework, and the last thing this world needs is another JavaScript Framework.)

JavaScript starter pack.)

P.S. You'll get this soon enough too.)

Until next time.)