JavaScript Program to Find HCF or GCD

// program to find the HCF or GCD of two integers

let hcf;
// take input
const number1 = prompt('Enter a first positive integer: ');
const number2 = prompt('Enter a second positive integer: ');

// looping from 1 to number1 and number2
for (let i = 1; i <= number1 && i <= number2; i++) {

    // check if is factor of both integers
    if( number1 % i == 0 && number2 % i == 0) {
        hcf = i;
    }
}

// display the hcf
console.log(`HCF of ${number1} and ${number2} is ${hcf}.`);

Output

Enter a first integer: 60
Enter a second integer: 72
HCF of 60 and 72 is 12.