Convert multidimensional array to a string in javascript?

Question

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

Are you sure you've provided us with the correct code? The solution you provided works fine 🙂 let input = [[123],[132],[321],[312],[213],[231]]; input.join(); outputs '123,132,321,312,213,231' — Ro Milton
– Ro Milton, Commented Jan 17, 2022 at 23:07
@RoMilton Apologies, there is meant to be a comma in the numbers array — ubermo
– ubermo, Commented Jan 17, 2022 at 23:18
You will want to map your inner array with an empty join.. eg. input.map(m => m.join('')).join() — Keith
– Keith, Commented Jan 17, 2022 at 23:20

Ro Milton · Accepted Answer · 2022-01-17 23:22:51Z

1

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.

edited Jan 17, 2022 at 23:22

answered Jan 17, 2022 at 23:21

Ro Milton

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3 Comments

Keith Over a year ago

Just stick another join() on the end..

ubermo Over a year ago

@RoMilton thats almost there but my expected output is "123,132,321,312,213,231"

Ro Milton Over a year ago

It's updated now @ubermo

zitzennuggler · Accepted Answer · 2022-01-17 23:27:50Z

0

You almost there with your for loop

The other Solution from the User above me is in my opionion better

but here using your system you could do something like this:

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

// since we are working with an array why not use forEach, but you can also go with a normal for, or for of etc
input.forEach((array) => {
    // here we could another forEach for example
    array.forEach(number => { // adding all numbers inside the smaller array to one string
        output += number;
    })
    output += ','
})

output = output.slice(0, output.length - 1)

gives the output :

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

edited Jan 17, 2022 at 23:27

answered Jan 17, 2022 at 23:12

zitzennuggler

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1 Comment

ubermo Over a year ago

Apologies, there is meant to be a comma in the numbers array

Joey · Accepted Answer · 2022-01-17 23:41:50Z

0

Array.prototype.join() is what you're looking for, but to join each array element without any separators requires an empty string array.join(""):

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

    let stringified2DArray = ""

    for (let i in input) {
      if (i == input.length-1) stringified2DArray += input[i].join("")
      else stringified2DArray += input[i].join("") + ','
    }

    console.log(stringified2DArray)

In the above example, we loop through each inner array, join each element and add comma afterward. If it's the last iteration in the loop, we exclude the comma to avoid a trailing comma.

answered Jan 17, 2022 at 23:41

Joey

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