How to convert Number to Boolean in JavaScript ?
We convert a Number to Boolean by using the JavaScript Boolean() method. A JavaScript boolean results in one of the 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 “true” or “false”.
Syntax:
Boolean(variable/expression)
Example:
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 var 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 as Boolean(!!numvalue), it gives the result as “true“.
Output:
Before clicking on button:
After clicking on button:
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