Iterate over a JavaScript array without using nested for-loops

Question

I\'ve been trying to iterate over a multidimensional array in JavaScript, and print each element in the array. Is there any way to print each element in a multidimensional a

Answer 1

If you don't want to use nested loops, you can either flat the array or use a recursive function. Something like:

arr.forEach(function each(item) {
  if (Array.isArray(item))
    item.forEach(each);
  else
    console.log(item)
});

Answer 2

Sounds like the issue is that you may have a nesting of arbitrary depth. In that case, use a recursive function.

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

The Array.isArray will need a shim for older browsers.

if (!Array.isArray)
    Array.isArray = function(o) {
        return !!o && Object.prototype.toString.call(o) === "[object Array]"
    }