Multidimensional Array Javascript with nested loop

Question

For example i have a array like that

var myArray = [
[1,2,3],
[4,5,6],
[7,8,9,10],
[[11,12],[13,14,15]]];

    for (var i = 0;i < myArray.length;i++){
    for(var j = 0 ;j< myArray[i].length;j++){
        for(var k = 0;k< myArray[i][j].length;k++){
            console.log(myArray[i],[j][k]);

        }
    }
        
      
}

But output is only 11,12,13,14,15. And i wanna print all the values Could some one help to fix Thank you in advance

Does this answer your question? [Deep flat multidimensional array in Javascript](https://stackoverflow.com/questions/45218858/deep-flat-multidimensional-array-in-javascript) — choz, Dec 08 '21 at 17:21
Write a function (`x`) that takes an array and iterates over the elements of that array. In the function test every element and if its an array call `x` with that array.... — Andreas, Dec 08 '21 at 17:27
You have different levels of nesting in your array. `[1,2,3]` is in the "second level" whereas `[11,12]` and `[13,14,15]` are in the "third level". So for instance `myArray[i][j].length` will be `undefined` for `i == 0` — derpirscher, Dec 08 '21 at 17:28
That would be the perfect moment to use a recursive function, recalling itself each time one entry is an Array! — E-telier, Dec 08 '21 at 18:34

MWO · Accepted Answer · 2021-12-08T17:29:37.020

0

Use e.g. Array.prototype.flat(), .flat(2) flattens to the level of 2 arrays deep.

var myArray = [
[1,2,3],
[4,5,6],
[7,8,9,10],
[[11,12],[13,14,15]]];

console.log(myArray.flat(2));

edited Dec 08 '21 at 17:29

answered Dec 08 '21 at 17:27

MWO

2,627
2
10
25

Why that _"magic number"_ `2`? – Andreas Dec 08 '21 at 17:28
The depth level specifying how deep a nested array structure should be flattened. Defaults to 1. – MWO Dec 08 '21 at 17:32
Doesn't really answer my question ;) – Andreas Dec 08 '21 at 17:34
you can write Infinity if you're not sure how many levels you have. was not specified in the question though – MWO Dec 08 '21 at 17:39

score 0 · Answer 2 · answered Dec 08 '21 at 17:27

You can use recursive function first pass it the whole array then loop it and check if the element you are accessing is array or digit if its array call the same function again and only pass it this element otherwise if its digit just print it

This works even when you dont know how many nested arrays you have otherwise use MWO answer

var myArray = [
[1,2,3],
[4,5,6],
[7,8,9,10],
[[11,12],[13,14,15]]];

function printArray(arr){
  for(var i = 0; i < arr.length; i++){
    if(Array.isArray(arr[i])){
      printArray(arr[i]);
    }else{
      console.log(arr[i]);
    }
  }
}

printArray(myArray);

score 0 · Answer 3 · answered Dec 08 '21 at 19:27

This fucntion works for any depth of multi dimensional array. Using Recursion

var myArray = [1,2,33,44, [1,2,3], [[11,12],[13,14,15]]];

var myArray1 = [1,2,33,44, [[11,12],[13,14,15]]];


var deepFlattenArray = function (array){
    var result = []; 
    
    array.forEach(function (element) {
      if (Array.isArray(element)) {
          result = result.concat(deepFlattenArray(element)); 
      } else {
          result.push(element);
      }
    });
    
    return result;
};

console.log(deepFlattenArray(myArray));
 // output = [ 1,  2, 33, 44,  1, 2,  3, 11, 12, 13, 14, 15]

console.log(deepFlattenArray(myArray1));
// output = [1,  2, 33, 44, 11, 12, 13, 14, 15 ]

Multidimensional Array Javascript with nested loop

3 Answers3