JavaScript Booleans

Boolean is a primitive data type in JavaScript. Boolean can have only two values, true or false. It is useful in controlling program flow using conditional statements like if..else, switch, while, do..while.

Boolean Function

Boolean() function can be used to find if an expression is true

JS JavaScript - Boolean Function

<!DOCTYPE html>
<html lang="en" xmlns="">
    <p>Play around with Booleans</p>
    <button onclick="testBooleans()">Click me to test</button>
    <button onclick="testDonald()">Test Donald</button>
        function testBooleans() {
            var result = "No result";
            if (4 > 2) {
                result = "Comparison is true";
            else {
                result = "Comparison is false";
            document.getElementById("resultElement").innerHTML = result;
        function testDonald() {
            var result = "My name is Dick";
            var name = "Donald";
            if(name == "Donald") {
                result = "My name is Donald";
        document.getElementById("resultElement").innerHTML = result;
    <p id="resultElement"></p>

Learn more about JavaScript Conditions

Boolean Comparison

JS JavaScript - Boolean Comparison

Operator Description Example
== Equal To if(x == 20)
> Greater Than if(x > 20)
< Less Than if(x < 20)
>= Greater Than Or Equal To x >= 20
<= Less Than Or Equal To x <= 20
AND True When Both Operands are true if(age>20 && age <30)
OR True When One Of The Operands are true if(age==20 || age ==30)
NOT Toggles a statement from true to false or
from false to true
=== Equal Value And Equal Type var x = 20;
if(x === 20)    // true
if(x === "20") // false
!= Not Equal if(age != 20)
!== Not Equal Value OR Not Equal Type var x = 20;
if(x !== 20)     // false
if(x === "20") // true

Learn more about JavaScript Comparisons


The conditional (ternary) operator is the only JavaScript operator that takes three operands. This operator is frequently used as a shortcut for the if statement


JS JavaScript - Conditional

<!DOCTYPE html>
<html lang="en" xmlns="">
    <p>Play around with Booleans</p>
    <button onclick="testBooleans()">Click me to test</button>
    function testBooleans() {
        var age = 66;
        var testDriveCar = (age < 16) ? 'Too young to drive':'You are old enough to drive';
        document.getElementById("resultElement").innerHTML = testDriveCar;
    <p id="resultElement"></p>

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 false Comparing two numbers
20 > "30" false Converting "30" to number 30
20 > "Donald"
20 < "Donald"
20 == "Donald"
false String converts to NaN
"20" > "30" false Converts both strings to numbers
before comparing them
"20" < "30" true Converts both strings to numbers
before comparing them
"20" == "30" false Converts both strings to numbers
before comparing them
"30" == "30" true Converts both strings to numbers
before comparing them

Convert To Correct Type

Convert variables to the proper type before comparison to ensure a correct result

JS JavaScript - Convert To Correct Type

// Validate input to check if it is a number
if (isNaN(input)) {
    output = "Please add a number";
} else {
    output = (input < 20) ? "You are not old enough" : "You are old enough to enter";


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JS 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.

JS JavaScript: Strict Mode

The strict context prevents some actions and throws more exceptions. Strict mode changes previously accepted "bad syntax" into errors. Strict mode will for example prevent using undeclared variables. The "use strict" directive was new in ECMAScript version 5.

JS JavaScript: Comments

JavaScript comments can be used to to explain and make the code more readable. JavaScript comments can also prevent execution of code.

It is possible to comment code as a single-line comment or as a multi-line comment.

JS JavaScript: Errors

There will be errors in the code. It is good practice to handle exceptions/errors.

Exceptions are a type of error that occurs during the execution of an application. Errors should be logged. Sometimes it is possible to recover a bug and proceed.
Other cases the user should get inform....


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.

3.      Increased interactivity − You can create interfaces that react when the user hovers over them with a mouse or activates them via the keyboard.

4.      Richer interfaces − You can use JavaScript to include such items as drag-and-drop components and sliders to give a Rich Interface to your site visitors.


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