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

Operator Description Comparing Returns Try it
== is equal to x==8 false Try it »
x==5 true Try it »
=== is exactly equal to (value and type) x==="5" false Try it »
x===5 true Try it »
!= is not equal x!=8 true Try it »
!== is not equal (neither value nor type) x!=="5" true Try it »
x!==5 false Try it »
> is greater than x>8 false Try it »
< is less than x<8 true Try it »
>= is greater than or equal to x>=8 false Try it »
<= is less than or equal to x<=8 true Try it »

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.

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

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 of voteable will be "Old enough":

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

Try it yourself »

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