A JavaScript boolean represents one of two values: true or false. However, if one wants to convert a variable that stores a boolean value, into an integer "0" or "1", they can do so using multiple approaches.

Below are the approaches to convert a boolean to a number/integer in JavaScript:

Using ternary or conditional operator

This JavaScript code initializes a boolean variable boolvalue as true. It then uses a ternary operator to convert boolvalue into a number (1 for true, 0 for false), assigning the result to numberValue. Finally, it outputs the numeric value to the console.

Syntax:

let i = value ? 1 : 0;

Example: This example shows the implementation of the above-mentioned approach.

// Initializing boolvalue as true
let boolvalue = true;

// JavaScript program to illustrate boolean 
// conversion using ternary operator
let numberValue = boolvalue ? 1 : 0;

// Output the number value to the console
console.log(
	"The number value of the variable is: " + numberValue);

// Initializing boolvalue as true

let boolvalue = true;

​

// JavaScript program to illustrate boolean 

// conversion using ternary operator

let numberValue = boolvalue ? 1 : 0;

​

// Output the number value to the console

console.log(

    "The number value of the variable is: " + numberValue);

The number value of the variable is: 1

Using unary + operator

This JavaScript code initializes a boolean variable boolvalue as true. The function myFunction converts this boolean to a number using the unary plus operator (+). It then logs the numeric value to the console. Calling myFunction() outputs 1, the numeric representation of true.

Syntax:

let i = + boolvalue;

Example: This example shows the implementation of the above-mentioned approach.

// Initializing boolvalue as true
let boolvalue = true;

function myFunction() {
    let i = +boolvalue;

    // Using unary plus to convert boolean to number
    console.log("The value of the variable is now: " + i);
}

myFunction();

// Initializing boolvalue as true

let boolvalue = true;

​

function myFunction() {

    let i = +boolvalue;

​

    // Using unary plus to convert boolean to number

    console.log("The value of the variable is now: " + i);

}

​

myFunction();

The value of the variable is now: 1

Using bitwise And (&) or bitwise Or ( | ) operator

This JavaScript code initializes two boolean variables: boolvalue as true and boolvalue2 as false. The myFunction converts these booleans to numbers using bitwise operators—& for boolvalue (resulting in 1) and | for boolvalue2 (resulting in 0). The results are logged to the console.

Syntax:

let i = boolvalue & 1; // bitwise and
letj  = boolvalue | 0; // bitwise or

Example: This example shows the implementation of the above-mentioned approach.

// Initializing boolvalue as true
let boolvalue = true;

// Initializing boolvalue2 as false
let boolvalue2 = false;

function myFunction() {

    // Using bitwise AND to convert boolvalue to number
    let i = boolvalue & 1; // true & 1 results in 1

    // Using bitwise OR to convert boolvalue2 to number
    let j = boolvalue2 | 0; // false | 0 results in 0

    console.log("The value of variable 1 is now: " + i);
    console.log("The value of variable 2 is now: " + j);
}

myFunction();

// Initializing boolvalue as true

let boolvalue = true;

​

// Initializing boolvalue2 as false

let boolvalue2 = false;

​

function myFunction() {

​

    // Using bitwise AND to convert boolvalue to number

    let i = boolvalue & 1; // true & 1 results in 1

​

    // Using bitwise OR to convert boolvalue2 to number

    let j = boolvalue2 | 0; // false | 0 results in 0

​

    console.log("The value of variable 1 is now: " + i);

    console.log("The value of variable 2 is now: " + j);

}

​

myFunction();

The value of variable 1 is now: 1
The value of variable 2 is now: 0

Using Number() function

This JavaScript code initializes a boolean variable boolvalue as true. The myFunction converts this boolean to a number using the Number() function, resulting in 1. The function logs the numeric value to the console.

Syntax:

let i = Number(boolvalue);

Example: This example shows the implementation of the above-mentioned approach.

// Initializing boolvalue as true
let boolvalue = true;

function myFunction() {

    // Using Number() function to convert 
    // boolvalue to a number
    let i = Number(boolvalue); // true converts to 1
    console.log("The value of the variable is now: " + i);
}

myFunction();

// Initializing boolvalue as true

let boolvalue = true;

​

function myFunction() {

​

    // Using Number() function to convert 

    // boolvalue to a number

    let i = Number(boolvalue); // true converts to 1

    console.log("The value of the variable is now: " + i);

}

​

myFunction();

The value of the variable is now: 1