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JavaScript comparisons


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

Comparison operators

Comparison operators are used in logical statements to determine whether variables or values are equal.

We are given x = 5, and the comparison operators are explained in the following table:


Operator Description Compare Return Testing
== equal x == 8 false
x == 5 true
x == "5" true
=== Equal values and types x === 5 true
x === "5" false
! = Not equal x! = 8 true
! == Values or types are not equal x! == 5 false
x! == "5" true
x! == 8 true
> 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

How to use

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

if (age < 18) text = "too young";

You will learn more about conditional statements in the following chapters of this tutorial.

Logical operators

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

We have given x = 6 and y = 3, the following table explains the logical operators:

operator Description Example test
&& versus (x < 10 && y > 1) fortrue
|| or (x == 5 || y == 5) forfalse
! Non !(x == y) fortrue

Conditional (ternary) operator

JavaScript also includes conditional operators that assign values to variables based on certain conditions.

Syntax

  variablename  = ( condition )?  value1 :  value2  

Example

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

If the value of the variable age is less than 18, the value of the variable voteable will be "too young", otherwise the value of the variable voteable will be "mature enough".