how to remove specific element from 2D Array in swift

Question

I have a [[String]] like

myArr = [["1_2","1_3","1_4"], ["2_1","2_2","2_3"], ["3_1","3_2","3_3"]] then

I Want to remove element like this bypassArr = ["1_2","2_3","3_2"]

how to remove bypassArr from myArr using element. or how can i get this type of result.

result = [["1_3","1_4"], ["2_1","2_2"], ["3_1","3_3"]]

score 5 · Accepted Answer · answered Feb 25 '19 at 06:27

If the intention is to remove all elements from bypassArr in the “inner” arrays from myArr then a combination of map() and filter() does the trick:

let myArr = [["1_2","1_3","1_4"], ["2_1","2_2","2_3"], ["3_1","3_2","3_3"]]
let bypassArr = ["1_2","2_3","3_2"]

let result = myArr.map { innerArray in
    innerArray.filter { elem in
        !bypassArr.contains(elem)
    }
}

print(result)
// [["1_3", "1_4"], ["2_1", "2_2"], ["3_1", "3_3"]]

The inner arrays are filtered to remove the given elements, and the outer array is mapped to the filtered results.

Or with short-hand parameter notation:

let result = myArr.map { $0.filter { !bypassArr.contains($0) }}

RajeshKumar R · Answer 2 · 2019-02-25T05:59:50.967

2

var myArr = [["1_2","1_3","1_4"], ["2_1","2_2","2_3"], ["3_1","3_2","3_3"]]
let bypassArr = ["1_2","2_3","3_2"]
if myArr.count == bypassArr.count {
    myArr = bypassArr.enumerated().map({ (index, str) -> [String] in
        if let strPos = myArr[index].firstIndex(of: str) {
            myArr[index].remove(at: strPos)
        }
        return myArr[index]
    })
}
print(myArr)

edited Feb 25 '19 at 05:59

answered Feb 25 '19 at 05:45

RajeshKumar R

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Result is = [["1_3", "1_4"], ["2_1", "2_2", "2_3"], ["3_1", "3_2", "3_3"]] but not remove "2_3" and 3_2 on your result – ikbal Feb 25 '19 at 05:47
Thanks for trying @RajeshKumar but when i Remove let bypassArr = ["1_2","2_1","2_3","3_2"] like then result is wrong. – ikbal Feb 25 '19 at 06:08
I performed the action only if both array counts are same – RajeshKumar R Feb 25 '19 at 06:22
ok but my count is different. – ikbal Feb 25 '19 at 06:28
What problem you have with Martin R's answer? – RajeshKumar R Feb 25 '19 at 06:40

how to remove specific element from 2D Array in swift

2 Answers2