Arrays are of type String. Since It is time consuming to add "", I have written it like Int. Sorry.
I have two arrays say var array1 = [[1,2,3,4,5,6,7,8,9]] and
var array2 = [[1,2,3,4],
[2,3,4,5],
[2,4,5,6],
[1,2,3,4,5,6,7,8,9],
[1,2,3,4,5,6,7,8],
[2,3,4,5,6,7,8]]
I have to compare each array element of array2 with array1 and insert '-' where the elements do not match. Like this,
var array2 = [[1,2,3,4,-,-,-,-,-],
[-,2,3,4,5,-,-,-,-],
[-,2,-,4,5,6,-,-,-],
[1,2,3,4,5,6,7,8,9],
[1,2,3,4,5,6,7,8,-],
[-,2,3,4,5,6,7,8,-]]
I tried to iterate over each array in array2 and compare it with array1, compare the indices and insert '-' to at index position i, but I am getting unexpected results.
UPDATE
for item in array2{
var elementsArray = item
for i in stride(from: 0, to: elementsArray.count, by: 1) {
if elementsArray[i] != array1[i]
{
elementsArray.insert("-", at: i)
}
print("elemnt array.....", elementsArray, "\n\n")
}
}
I had thought of comparing each array of array2 with array1 by count, find the index of uncommon element and then insert '-' at that index position. Is this approach right? Please help me with this.
You want a new array where each row of array2 is replaced by a variant of array1, with elements not originally present in the row replaced by "-":
let array1 = [1,2,3,4,5,6,7,8,9]
let array2 = [[1,2,3,4],
[2,3,4,5],
[2,4,5,6],
[1,2,3,4,5,6,7,8,9],
[1,2,3,4,5,6,7,8],
[2,3,4,5,6,7,8]]
let filled = array2.map { row in
array1.map {
row.contains($0) ? String($0) : "-"
}
}
for row in filled { print(row) }
Output:
["1", "2", "3", "4", "-", "-", "-", "-", "-"] ["-", "2", "3", "4", "5", "-", "-", "-", "-"] ["-", "2", "-", "4", "5", "6", "-", "-", "-"] ["1", "2", "3", "4", "5", "6", "7", "8", "9"] ["1", "2", "3", "4", "5", "6", "7", "8", "-"] ["-", "2", "3", "4", "5", "6", "7", "8", "-"]
For large arrays this can be improved by creating a Set(row) for a faster containment check, or by utilizing that the elements are in increasing order.
Your approach does not work correctly because elementsArray is modified while iterating over it.
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