Recursive loop over multi dimensional arrays in JavaScript

loop-multi-d-arrays.js

// code from
// http://stackoverflow.com/questions/15854425/iterate-over-a-javascript-array-without-using-nested-for-loops/15854485#15854485

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

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