let Non-mutable array in swift

Question

let type variable are supposed to be constants, but reassign a value later does not throw any error.

How do I create a non-mutable array.

  let testArray = ["Catfish","water","tulips"]
  print(testArray[1])
  testArray[1] = "bottle of water"
  print(testArray[1])

The output is "waterbottle of water"

possible duplicate of How do you create an immutable array in Swift? — Matt Gibson
– Matt Gibson, Commented Jun 30, 2014 at 6:12

Connor · Accepted Answer · 2014-06-29 14:27:33Z

1

You aren't reassinging the array itself, but an element of the array. This is allowed in Swift. There isn't currently a way to make all of the elements in the array immutable. It should be changed in a future update though.

You may also want to take a look at this. Arrays have interesting assignment and copying behavior in Swift.

answered Jun 29, 2014 at 14:27

Connor

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