I am trying to merge two array:
array 1
[["aaa","111"],["bbb","222"],["ccc","333"]]
array 2
[["ddd","444"],["eee","555"],["fff","666"]]
What I want to achieve is to have a single array with the values respecting the array positions such as:
merged array
[["aaa","111"],["ddd","444"],["bbb","222"],["eee","555"],["ccc","333"],["fff","666"]]
How could I do this using Swift 2
let arr1 = [["aaa","111"],["bbb","222"],["ccc","333"]]
let arr2 = [["ddd","444"],["eee","555"],["fff","666"]]
let arr3 = arr1 + arr2
print(arr3) // [["aaa", "111"], ["bbb", "222"], ["ccc", "333"], ["ddd", "444"], ["eee", "555"], ["fff", "666"]]
in you case, with specific requirements
let arr4 = zip(arr1, arr2).reduce([]) { (var arr, p:(Array<String>, Array<String>)) -> [[String]] in
arr.append(p.0)
arr.append(p.1)
return arr
}
print(arr4) // [["aaa", "111"], ["ddd", "444"], ["bbb", "222"], ["eee", "555"], ["ccc", "333"], ["fff", "666"]]
UPDATE in accordance with your needs mentioned in notes you can add the rest of values this way (please change let arr4 to var arr4 first!!!)
var i = arr4.count / 2
while i < arr1.count {
arr4.append(arr1[i++])
}
while i < arr2.count {
arr4.append(arr2[i++])
}
print(arr4)
this gives you
[["aaa", "111"], ["ddd", "444"], ["bbb", "222"], ["eee", "555"], ["ccc", "333"], ["fff", "666"], ["zzz", "755"]]
it should work, even though one of the arrays is empty
let arr1 = [["aaa","111"],["bbb","222"],["ccc","333"],["zzz","755"]] - let arr2 = [["ddd","444"],["eee","555"],["fff","666"]]print(arr4) // [["aaa", "111"], ["ddd", "444"], ["bbb", "222"], ["eee", "555"], ["ccc", "333"], ["fff", "666"],["zzz","755"],...]use zip function
Array(zip(arr1, arr2))
@edit
as @user3441734 mentioned zip returns tupes. To fix that you can use flatMap
var a = [["aaa","111"],["bbb","222"],["ccc","333"]]
var b = [["ddd","444"],["eee","555"],["fff","666"]]
var cos = Array(zip(a, b))
var eee = cos.flatMap { [$0.0, $0.1] }
result:
[["aaa", "111"], ["ddd", "444"], ["bbb", "222"], ["eee", "555"],["ccc", "333"], ["fff", "666"]]
short answer:
var result = zip(arr1, arr2).flatMap { [$0.0, $0.1] }
