Javascript Introduction

Camel Case

• Historically, programmers have used different ways of joining multiple words into one variable name
• Hyphens 
• first-name
• last-name
• master-name
• inter-city
• Underscore
• first_name
• last_name
• master_card
• inter_city
• Upper Camel Case
• FirstName
• LastName
• MasterCard
• InterCity
• Lower Camel Case
• firstName
• lastName
• masterCard
• interCity

JavaScript Comments

• Single Line Comments
• Single line comments start with //.
• Any text between // and the end of the line will be ignored by JavaScript (will not be executed).
• Multi-line Comments
• Multi-line comments start with /* and end with */.
• Any text between /* and */ will be ignored by JavaScript.

JavaScript Variables

• JavaScript variables are containers for storing data values.
• example
• x stores the value 5 (x = 5)
• y stores the value 6 (y = 6)

JavaScript Operators

• The assignment operator (=) assigns a value to a variable
• The addition operator (+) adds numbers
• The multiplication operator (*) multiplies numbers
• addition assignment operator (+=) adds a value to a variable
• x=3
• x+=3
• Output is 6

Operator	Description
+	Addition
-	Subtraction
*	Multiplication
**	Exponentiation
/	Division
%	Modulus
++	Increment
--	Decrement

Operator	Example	Sample Function
=	x=y	x=y
+=	x +=y	x=x+y
-=	x-=y	x=x-y
*=	x*=y	x=x*y
/=	x/=y	x=x/y
%=	x%=y	x=x%y

Operator	Description
==	equal to
===	equal value and equal type
!=	not equal
!==	not equal value or not equal type
>	greater than
<	less than
>=	greater than or equal to
<=	less than or equal to
?	ternary operator

JavaScript Functions

• function is a block of code
• Designed to perform a particular task

Function Syntax

• function is defined with the function keyword
• Followed by a name
• Last followd by parameter between ()

function name(parameter1, parameter2, parameter3) {
  // what function you want type here
}

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