Why is this array out of index?

Question

I am trying to sort elements into a two dimensional array I built this way, but when the code gets to the 2D array I get an error: \"array out of index\".

var ca         


        

Answer 1

This worked in the end

for x in categories{
                for y in array{
                    if x == String(stringInterpolationSegment: y.categoryName){
                        var tempArray: [ProductCatalogue] = [y]
                    categoryTempArray.append(tempArray)
                        j++
                    }
                }
                i++
            }

then i can use array like this categoryTempArray[i][j]

Answer 2

You should initialize the [i]th element before than appending some [j]th element to it.

You would call the append() function on an item that does not exist, since no item exists in the categoryTempArray array, thus the index out of bound.