Swift 3 array - remove multiple elements with help of other array - ios

Question

Swift 3:
I've two arrays, one is an array of the dictionary(json) and another is of indexes (Int value) of index Path (Collection type Index with element row & section). With the help of index rows of the second array, I need to remove, elements from the first array.
var arrayString = [ // Array with Json elements
{ "name" : "A" },
{ "name" : "B" },
{ "name" : "C" },
{ "name" : "D" },
{ "name" : "E" },
{ "name" : "F" },
{ "name" : "G" },
{ "name" : "H" }
]
Now Second array (to be removed from the first array)
var arrayIndex = [ 2, 3, 5 ] // Array with
How can I do this?
I want resulting array like
var arrayString = [
{ "name" : "A" },
{ "name" : "D" },
{ "name" : "F" },
{ "name" : "G" },
{ "name" : "H" }
]

Answer 1

Your array arrayIndex is look like Array of Int not array of IndexPath.
arrayIndex.sorted(by: >).forEach { if $0 < self.arrayString.count { self.arrayString.remove(at: $0) } }
If arrayIndex is Array of IndexPath then use row property to remove the object from array.
arrayIndex.sorted(by: { $0.row > $1.row }).forEach { if $0.row < self.arrayString.count { self.arrayString.remove(at: $0.row) } }

Answer 2

Here's a functional approach using enumerated, filter, contains, and map to create the array:
var arrayString = [
[ "name" : "A" ],
[ "name" : "B" ],
[ "name" : "C" ],
[ "name" : "D" ],
[ "name" : "E" ],
[ "name" : "F" ],
[ "name" : "G" ],
[ "name" : "H" ]
]
let arrayIndex = [2, 3, 5]
arrayString = arrayString.enumerated()
.filter { !arrayIndex.contains($0.0 + 1) }
.map { $0.1 }
print(arrayString)
[["name": "A"], ["name": "D"], ["name": "F"], ["name": "G"], ["name": "H"]]
Explanation:
.enumerated() takes the original array and creates an array of tuple pairs containing the index of each item paired with the item: (index, item)
filter selects those items from the resulting array that return true from the passed (trailing) closure. In this case, an item is selected if its index is not in arrayIndex
map is used to pull just the item from the resulting array of tuples
the index was increased by 1 because your example seemed to indicate that your arrayIndex started at 1 and not 0