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JavaScript Boolean operators allow you to perform different comparisons on the specified variables and evaluate the results. Here is the list of Boolean operators supported by JavaScript:

  • Boolean OR ||” operator
  • Boolean AND &&” operator
  • Boolean NOT !” operator

OR operator

It is represented using the double pipe operator “||”.

result = x || y

OR behaves as described in the following truth table:

xyx || y

AND operator

It is represented by using a double ampersand &&” sign.

result = x && y

AND behaves as described in the following truth table:

xyx && y

NOT operator

it is represented by an exclamation mark “!”.

var result = ! x;

Based on the values of the “x” variable, the corresponding “!x” will work as follows:

Object {}false
Empty string “ “true
Non-empty stringfalse
Number other than 0false

JavaScript Boolean operators examples

Simple example code.

<!DOCTYPE html>

    // OR 
    let x = true, y = false;
    var res = x || y;
    console.log("OR ||", res);

    // And 
    var res = x && y;
    console.log("And &&", res);

    // NOT 
    console.log("NOT", !x);
    console.log("NOT", !y);



JavaScript boolean operators

What Boolean operators can be used in JavaScript?

Answer: There are three operators: AND, OR, and NOT used as Boolean operators in JS. You can either in a database or in coding and come very handy to developers when building components of a complex logic or flow.

Do comment if you have any doubts or suggestions on this JS boolean topic.

Note: The All JS Examples codes are tested on the Firefox browser and the Chrome browser.

OS: Windows 10

Code: HTML 5 Version

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