# What’s your alternative solution? Challenge #52

This is series of daily JavaScript coding challenges... for both beginners and advanced users.

Each day I’m gone present you a very simple coding challenge, together with the solution. The solution is intentionally written in a didactic way using classic JavaScript syntax in order to be accessible to coders of all levels.

Solutions are designed with increase level of complexity.

## Today’s coding challenge

``````Find the maximum number in a jagged array of numbers or array of numbers

``````

(scroll down for solution)

## Code newbies

If you are a code newbie, try to work on the solution on your own. After you finish it, or if you need help, please consult the provided solution.

You can solve it using functional concepts or solve it using a different algorithm... or just solve it using the latest ES innovations.

By providing a new solution you can show code newbies different ways to solve the same problem.

## Solution

``````// Solution for challenge46b

var ar = [2, 4, 10, [12, 4, [100, 99], 4], [3, 2, 99], 0];

var max = findMax(ar);
println("Max  = ", max);

// Use a stack to find the maximum numeric value in an array of arrays
function findMax(arElements)
{
var max = -Infinity;

// This is the stack on which will put the first array and then
// all the other sub-arrays that we find as we traverse an array
var arrays = [];

arrays.push(arElements);

// Loop as long as are arrays added to the stack for processing
while(arrays.length > 0)
{
// Extract an array from the stack
ar = arrays.pop();

// ... and loop through its elements
for(var i = 0; i < ar.length; i++)
{
var el = ar[i];

// If an element is of type array, we'll add it to stack
// to be processed later
if ( Array.isArray(el) )
{
arrays.push(el);
continue;
}

if ( el > max )
{
max = el;
}
}
}

return max;
}

``````

To quickly verify this solution, copy the code above in this coding editor and press "Run".

Note: The solution was originally designed for codeguppy.com environment, and therefore is making use of `println`. This is the almost equivalent of `console.log` in other environments. Please feel free to use your preferred coding playground / environment when implementing your solution.

## Discussion  Borja Herrero

Nice one! I'd go with this one.

``````const ar = [2, 4, 10, [12, 4, [100, 99], 4], [3, 2, 99], 0];

const max = findMax(ar);
println("Max  = ", max);

function findMax(array) {
// First we flatten the array using Infinity as depth
// Then we sort the numbers from higher to lower
const sortedFlatArray = array.flat(Infinity).sort((a, b) => b - a);

// First item it's the highest
return sortedFlatArray;
}

``````