JavaScript Comparisons

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

JavaScript provides three different value-comparison operations, loose equality, strict equality and They have different usage so learn when to use them.

Learn more about JavaScript Booleans

Comparison Operators

Use comparison operators in logical statements to discover equality or difference between variables or values.

You might be familiar with comparison operators from the maths.

The returnvalue is a boolean type.

true – means “yes”, “correct” or “the truth”.
false – means “no”, “wrong” or “a lie”.


Operator Description Example Return


Equality check - Note that you must
use the double equation sign

This is also called a Loose Equality comparison

4 == 4



Not Equal check (In maths the notation is )

This is also called a Loose Equality comparison

3 != 4



Greater than

3 > 4



Less than

3 < 4



Greater than or equals

3 >= 4

3 >= 3




Less than or equals

3 <= 4

3 <= 3




Equal value AND equal type.

This is also called a Strict Equality comparison

4 === 4

4 === "4"




Not equal value OR not equal type

This is also called a Strict Equality comparison

4 !== 4

4 !== "4"

3 !== 4




Learn more about JavaScript Conditions Learn more about JavaScript Dates

Comparing Different Types

Comparing data of different types may give unexpected results.

JavaScript will convert the string to a number when comparing a string with a number. An empty string converts to 0. A non-numeric string converts to NaN (Not A Number) and will always be false.

Case Boolean Description

20 > 30


Comparing two numbers

20 > "30"


Converting "30" to number 30

20 > "Donald"
20 < "Donald"
20 == "Donald"


String converts to NaN

"20" > "30"


Converts both strings to numbers
before comparing them

"20" < "30"


Converts both strings to numbers
before comparing them

"20" == "30"


Converts both strings to numbers
before comparing them

"30" == "30"


Converts both strings to numbers
before comparing them

Learn more about JavaScript Arithmetics Learn more about JavaScript Statements Comparing Operator

The method determines whether two values are the same value. will behave almost the same way as a Strict Equality comparison, but with special handling for NaN and -0 and +0.

JS JavaScript - Comparing Operator

// value1: The first value to compare.
// value2: The second value to compare.
// Return value: A Boolean indicating if the two arguments are the same value., value2); continue

Comparing two values with method.

Two values are the same if one of the following holds:

  • both undefined
  • both null
  • both true or both false
  • both strings of the same length with the same characters in the same order
  • both the same object
  • both numbers and
    • both +0
    • both -0
    • both NaN
    • or both non-zero and both not NaN and both have the same value

Take a look at the examples to understand this:

JS JavaScript - continue'car', 'car');     // true, window);   // true'car', 'bus');     // false[], []);           // false
var test = { x: 1 };, test);       // true, null);       // true
// Special Cases, -0);            // false, -0);           // true, 0/0);         // true

Learn more about JavaScript Objects Learn more about JavaScript Booleans Learn more about JavaScript Numbers

Comparison Summary

  • Comparison operators return a logical value.

  • Strings are compared letter-by-letter in the “dictionary” order.

  • When values of different types are compared, they get converted to numbers (with the exclusion of a strict equality check).

  • Values null and undefined equal == each other and do not equal any other value.

  • Be careful when using comparisons like > or < with variables that can occasionally be null/undefined. Make a separate check for null/undefined.


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JavaScript is one of the 3 core language technologies of the World Wide Web that all web developers must learn:

1.      HTML to define the content of web pages.

2.      CSS to specify the layout of web pages.

3.      JavaScript to program the behavior of web pages.

JavaScript is a scripting or programming language that allows you to implement complex things on web pages. Every time a web page does more than just sit there and display static information for you to look at, displaying timely content updates, interactive maps, animated 2D/3D graphics, scrolling video jukeboxes, etc. − you can bet that JavaScript is probably involved.

The benefits of using JavaScript are:

1.      You can validate user input before sending the page off to the server. This saves server traffic, which means less load on your server.

2.      Immediate feedback to the visitors − They don't have to wait for a page reload to see if they have forgotten to enter something.

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