const mod = (a, b) => { 
    return new Promise((resolve, reject) => { 
        if (b == 0) { 
            // Rejected (error) 
            reject("Modulo zero is not allowed"); 
        } else { 
            // Resolved (Success) 
            resolve(a % b); 
        } 
    }); 
}; 
  
// 5 mod 2 will give result 1 
async function _5mod2() { 
    try { 
        const res = await mod(5, 2); 
        console.log(`The result of division is {res}`); 
    } catch (err) { 
        console.log(err); 
    } 
}; 
_5mod2(); 
  
// 5 mod 0 will give error 
async function _5mod0() { 
    try { 
        const res = await mod(5, 0); 
        console.log(`The result of division is{res}`); 
    } catch (err) { 
        console.log(err); 
    } 
}; 
_5mod0(); 

The result of division is 1
Modulo zero is not allowed