Array –join(_:) function throws an EXC_BAD_ACCESS.
var ar1 = [1,2,3]
var ar2 = [5,6,7]
var res = ar1.join(ar2)
Has anyone faced this problem? Any solution or suggestion?
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Kostiantyn Koval
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join is not the operation to add , http://stackoverflow.com/questions/24002733/add-an-element-to-an-array – Arun Jul 18 '14 at 08:32
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1so what's thy porpoise of this method? It takes Sequence and return and Array [T]. – Kostiantyn Koval Jul 18 '14 at 08:43
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The join method for strings in objective is perhaps better named: `componentsJoinedByString` but is not available for arrays. – zaph Jul 18 '14 at 13:39
1 Answers
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What you want is
var ar1 = [1,2,3]
var ar2 = [5,6,7]
var res = ar1 + ar2
You would usually use join() to flatten a two level array by inserting the elements from another array in between first level elements:
var ar1 = [1,2,3]
var ar2 = [[4,5,6],[7,8,9],[10,11,12]]
let res = ar1.join(ar2) // [4, 5, 6, 1, 2, 3, 7, 8, 9, 1, 2, 3, 10, 11, 12]
The function works in the same fashion for strings also:
let ar1 = ["1","2","3"]
let res = ".!?".join(ar1) // "1.!?2.!?3"
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Note that your last example calls the join method of the String class, not of the Array class as in the question. – Martin R Jul 18 '14 at 09:01
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in the method declaration - func join
(elements: S) -> [T] if method is suppose to take an arrays of arrays it should be sometinh like this `– Kostiantyn Koval Jul 18 '14 at 12:56 -
1@KonstantinKoval: As I understand it `[[T]]` is treated as `Sequence<[T]>`. – Martin R Jul 18 '14 at 13:49