To find Index of Multidimensional Array in Javascript

this example seems to work well also with IRREGULAR multidimentional array:

function findIndex(valueToSearch, theArray, currentIndex) {
    if (currentIndex == undefined) currentIndex = '';
        if(Array.isArray(theArray)) {
            for (var i = 0; i < theArray.length; i++) {
                if(Array.isArray(theArray[i])) {
                    newIndex = findIndex(valueToSearch, theArray[i], currentIndex + i + ',');
                    if (newIndex) return newIndex;
               } else if (theArray[i] == valueToSearch) {
                   return currentIndex + i;
               }
            }
    } else if (theArray == valueToSearch) {
        return currentIndex + i;
    }
    return false;
}

var a = new Array();
a[0] = new Array(1, 2, 3, 4, 5);
a[1] = 'ciao';
a[2] = new Array(new Array(6,7),new Array(8,9),10);

var specificIndex = findIndex('10', a);

i wrote this speedly so everyone is invited to improve this function!

p.s. now the function returns a STRING value with all indexes separated by comma, you can simply edit it to returns an object

On jsfiddle

function indexOf2d(arr, val) {
    var index = [-1, -1];

    if (!Array.isArray(arr)) {
        return index;
    }

    arr.some(function (sub, posX) {
        if (!Array.isArray(sub)) {
            return false;
        }

        var posY = sub.indexOf(val);

        if (posY !== -1) {
            index[0] = posX;
            index[1] = posY;
            return true;
        }

        return false;
    });

    return index;
}

console.log(indexOf2d(array, 50));

JSFiddle

/**
 * Index of Multidimensional Array
 * @param arr {!Array} - the input array
 * @param k {object} - the value to search
 * @return {Array} 
 */
function getIndexOfK(arr, k) {
  for (var i = 0; i < arr.length; i++) {
    var index = arr[i].indexOf(k);
    if (index > -1) {
      return [i, index];
    }
  }
}

// Generate Sample Data
var k = 0;
var array = [];
for (var i = 0; i < 10; i++) {
  array[i] = [];
  for (var j = 0; j < 100; j++) {
    k = k + 1;
    array[i].push(k);
  }
}
var needle = 130;
var result = getIndexOfK(array, needle);
console.log('The value #' + needle + ' is located at array[' + result[0] + '][' + result[1] + '].');