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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
Updated on: 22-Jan-2021
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