Javascript-Lesson 3

Operators

Comparison Operators

Comparison operators are used to test if a statement is true or false. Assume in the table that x = 6;

Operator	Description	Example
==	is equal to	x = 4 is false
===	is exactly equal to value and type	x = 6 is true x = '6' is false
!=	is not equal	x != 10 is true
>	is greater than	x > 12 is false
<	is less than	x < 12 is true
>=	is greater than or equal to	x >= 12 is false
<=	is less than or equal to	x <= 12 is true

Logical Operators

In the table below assume that x = 10; and y = 5;

Operator	Description	Example
&&	and	(x < 8 && y > 2) is true
||	or	(x == 7 || y == 7) is false
!	not	!( x == y) is true

if statement

The syntax for the 'if' statement is:

if (condition)
{
code to be executed if the condition is true
}

if...else statement

The syntax for 'if..else' statement is:

if (condition)
{
code to be executed if the condition is true
}
else
{
code to be executed if the condition is false
}