JavaScript Syntax

Syntax.js

//JavaScript Values
var x, y;          // How to declare variables
x = 5; y = 6;      // How to assign values
z = x + y;         // How to compute values

//JavaScript Literals
Numbers are written with or without decimals:
10.50

1001
Strings are text, written within double or single quotes:
"John Doe"

'John Doe'

//JavaScript Operators
arithmetic operators:
(5 + 6) * 10
assignment operator :
var x, y;
x = 5;
y = 6;

//JavaScript Expressions
5 * 10
x * 10
"John" + " " + "Doe"

//JavaScript Keywords
var x, y;
x = 5 + 6;
y = x * 10;

//JavaScript Comments
var x = 5;   // I will be executed
// var x = 6;   I will NOT be executed

//JavaScript Identifiers
In JavaScript, the first character must be a letter, or an underscore (_), or a dollar sign ($).

//JavaScript is Case Sensitive
var lastname, lastName;
lastName = "Doe";
lastname = "Peterson";