Question

How to check if a number is duck number in Node.js

Answer 1

// A Duck number is a positive number which has zeroes present in it

function check_duck_numbers(s) {
    let i = 0, len = s.length;
    
    // Ignore leading 0s // numbers with leading 0s is not Duck Number
    while (i < len && s[i] == '0')
        i++;
 
    while (i < len) {
        if (s[i] == '0')
            return true;
             
        i++;
    }
    return false;
}
 
const number = 19208;
const s = number.toString(); 
 
if (check_duck_numbers(s))
  	console.log("Duck Number");
else
    console.log("Not a duck Number");
  
if (check_duck_numbers('00384'))
  	console.log("Duck Number");
else
    console.log("Not a duck Number");  
  
  
  
    
/*
run:
    
Duck Number
Not a duck Number
    
*/

 

70+ SQL courses for beginners and professionals