Adding and removing of arrays elements in Swift
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var primeNumbers = [2, 5, 7]
primeNumbers.append(11)
//primeNumbers is [2, 5, 7, 11]
primeNumbers.insert(3, atIndex: 1)
//primeNumbers is [2, 3, 5, 7, 11]
primeNumbers.removeAtIndex(2)
//primeNumbers is [2, 3, 7, 11]
primeNumbers += [13, 17]
//primeNumbers is [2, 3, 7, 11, 13, 17]
primeNumbers[0...1] = [2, 3, 5]
//primeNumbers is [2, 3, 5, 7, 11, 13, 17]
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