JavaScript Comparison and Logical Operators

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Comparison and Logical operators are used to test for true or false.

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Comparison Operators

Comparison operators are used in logical statements to determine equality or difference between variables or values.

Given that x=5, the table below explains the comparison operators:

Operator	Description	Comparing	Returns
==	equal to	x==8	false
		x==5	true
===	exactly equal to (equal value and equal type)	x==="5"	false
		x===5	true
!=	not equal	x!=8	true
!==	not equal (different value or different type)	x!=="5"	true
		x!==5	false
>	greater than	x>8	false
<	less than	x<8	true
>=	greater than or equal to	x>=8	false
<=	less than or equal to	x<=8	true

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How Can it be Used

Comparison operators can be used in conditional statements to compare values and take action depending on the result:

if (age<18) x="Too young";

You will learn more about the use of conditional statements in the next chapter of this tutorial.

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Logical Operators

Logical operators are used to determine the logic between variables or values.

Given that x=6 and y=3, the table below explains the logical operators:

Operator	Description	Example
&&	and	(x < 10 && y > 1) is true
||	or	(x==5 || y==5) is false
!	not	!(x==y) is true

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Conditional Operator

JavaScript also contains a conditional operator that assigns a value to a variable based on some condition.

Syntax

variablename=(condition)?value1:value2 

Example

Example

If the variable age is a value below 18, the value of the variable voteable will be "Too young, otherwise the value ofvoteable will be "Old enough":

voteable=(age<18)?"Too young":"Old enough";