Arrays initialization in Swift
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//Empty array
let n1: [Int] = []
let n2 = [Int]()
// Single-dimensional array
let n3: [Int] = [ 1, 2, 3 ]
let n4 = [ 1, 2, 3 ]
let s1 = [ "1", "2", "3" ]
// Multidimensional array.
let n5: [[Int]] = [[1, 2], [3, 4, 5]]
var n6 = [[1, 2], [3, 4, 5]]
n6[1][2] = 7
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