Swift Array join EXC_BAD_ACCESS

Question

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?

Answer 1

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"