Largest product of n contiguous digits of a number in JavaScript

We are required to write a JavaScript function that takes in two numbers as first and the second argument, let us call them m and n.

The first number will generally be a number with multiple digits and the second number will always be smaller than the number of digits in the first number.

The function should find the group of n consecutive digits from m whose product is the greatest.

For example −

If the input numbers are −

const m = 65467586;
const n = 3;

Then the output should be −

const output = 280;

because 7 * 5 * 8 = 280 and it’s the maximum consecutive three-digit product in this number

Example

Following is the code −

const m = 65467586;
const n = 3;
const largestProductOfContinuousDigits = (m, n) => {
   const str = String(m);
   if(n > str.length){
      return 0;
   };
   let max = -Infinity;
   let temp = 1;
   for(let i = 0; i < n; i++){
      temp *= +(str[i]);
   };
   max = temp;
   for(i = 0; i < str.length - n; i++){
      temp = (temp / (+str[i])) * (+str[i + n]);
      max = Math.max(temp, max);
   };
   return max;
}
console.log(largestProductOfContinuousDigits(m, n));

Output

Following is the console output −

280

AmitDiwan

Published on 22-Jan-2021 06:54:19