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JavaScript Comparison and Logical Operators

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

Comparison Operators

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

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

Operator Description Comparison Return Value Example
== Equal to x==8 false Example »
x==5 true Example »
=== Exactly equal (value and type) x==="5" false Example »
x===5 true Example »
!= Not equal x!=8 true Example »
!== Not exactly equal (value and type) x!=="5" true Example »
x!==5 false Example »
> Greater than x>8 false Example »
< Less than x<8 true Example »
>= Greater than or equal to x>=8 false Example »
<= Less than or equal to x<=8 true Example »

How to Use

You can use comparison operators in conditional statements to compare values and take action based on the result:

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

Logical Operators

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

Given 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

Conditional Operator

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

Syntax

Example

Example

If the value in the variable age is less than 18, assign "Too young" to the variable voteable, otherwise assign "Old enough".

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