Convert multidimensional array to a string in javascript?

My input is a multidimensional array and I want everything in the array to be in one string –

Input –

let input = [[1,2,3],[1,3,2],[3,2,1],[3,1,2],[2,1,3],[2,3,,1]]

Expected Ouput

"123,132,321,312,213,231"

I have tried

input.join() // which gives me

"1,2,3,1,3,2,3,2,1,3,1,2,2,1,3,2,3,1"

And also I have tried

input.join('') // which gives me

"1,2,31,3,23,2,13,1,22,1,32,3,1"

I have also tried using a for loop for this

let input = [[1,2,3],[1,3,2],[3,2,1],[3,1,2],[2,1,3],[2,3,1]]
let output = ''

for (let i = 0; i < input.length; i++){
 let result = input[i]
 output += result.toString()
}

Which returns

 "123132321312213231"

I can’t seem to crack this… Any tips??

Thanks

>Solution :

Can be achieved simply using .map() with .join('') inside:

const input = [[1,2,3],[1,3,2],[3,2,1],[3,1,2],[2,1,3],[2,3,,1]];

const result = input.map(arr => arr.join('')).join();

console.log(result);

When you pass an empty string '' into .join(), all elements are joined without any characters in between them.