Converting of an array in Swift
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var numbers = [ 1, 2, 3, 4, 5 ]
numbers = numbers.map({ $0 * 3 })
//numbers is [ 3, 6, 9, 12, 15 ]
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var numbers = [ 1, 2, 3, 4, 5 ]
numbers = numbers.map({ $0 * 3 })
//numbers is [ 3, 6, 9, 12, 15 ]