How to convert Number to Boolean in JavaScript ? Last Updated : 29 Dec, 2023 Summarize Suggest changes Share Like Article Like Report We convert a Number to Boolean by using the JavaScript Boolean() method and double NOT operator(!!). A JavaScript boolean results in one of two values i.e. true or false. However, if one wants to convert a variable that stores integer “0” or “1” into Boolean Value i.e. "false" or "true". Below are the approaches: Table of Content Boolean() methodUsing double NOT(!!) operatorApproach 1: Boolean() methodThe boolean function returns the boolean value of the variable. It can also be used to find the boolean result of a condition, expression, etc Syntax: Boolean(variable/expression)Example: This example converts a number into a boolean. HTML <!DOCTYPE html> <html> <body> <center> <h1 style="color:green"> GeeksforGeeks </h1> <h4> Click the button to change the number value into boolean. </h4> <button onclick="myFunction()">Change</button> <p>The number value of the variable is :</p> <p id="result"></p> <script> // Initializing boolvalue as true let numvalue = 1; // JavaScript program to illustrate boolean // conversion using ternary operator function myFunction() { document.getElementById("result") .innerHTML = Boolean(numvalue); } </script> </center> </body> </html> Note: If the above Boolean() method is called as Boolean(!numvalue), it shows the result as "false". Similarly, if it is called Boolean(!!numvalue), it gives the result as "true". Output: Approach 2: Using double NOT(!!) operatorThis operator converts numbers with the value of zero to false and all other numbers to true. Example: In this example, we will use the double NOT operator to convert the number into a boolean value. HTML <!DOCTYPE html> <html> <body> <center> <h1 style="color:green"> GeeksforGeeks </h1> <h4> Click the button to change the number value into boolean. </h4> <button onclick="myFunction()">Change</button> <p>The number value of the variable is :</p> <p id="result"></p> <script> // Initializing boolvalue as true let numvalue = (!!1) // JavaScript program to illustrate boolean // conversion using ternary operator function myFunction() { document.getElementById("result") .innerHTML = (numvalue); } </script> </center> </body> </html> Output: Advertise with us Next Article Convert a Number to a String in JavaScript M manaschhabra2 Follow Similar Reads How numbers are stored in JavaScript ? In this article, we will try to understand how numbers are stored in JavaScript. Like any other programming language, all the data is stored inside the computer in the form of binary numbers 0 and 1. Since computers can only understand and process data in the form of 0's and 1's. 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