Array initialisation differences

Question

With Xcode 6.1.1, run xcrun swift, and then:

1> let a: [String] = []
a: [String] = 0 values

2> let b = Array<String>()
b: [String] = 0 values

3> let c = [String]()
c: [(String)] = 0 values

Why was c initialised to an array of 1-tuples?

It's just a notation. You're looking into the sausage factory so you see the sausage. — matt
– matt, Commented Feb 2, 2015 at 16:27

matt · Accepted Answer · 2015-02-02 16:29:41Z

2

It's just a notation. You're looking into the sausage factory so you see the bits of sausage; that's the price of using the REPL. Ask yourself in what way a 1-tuple differs from its contents... It doesn't. It's still just an array of string:

  1> var c = [String]()
c: [(String)] = 0 values
  2> c.append("hello")
  3> c
$R0: [(String)] = 1 value {
  [0] = "hello"
}

So [0] = "hello". No tuples here.

answered Feb 2, 2015 at 16:29

matt

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1 Comment

David Berry Over a year ago

To further elaborate, as far as the language is concerned, a 1-tuple ((String)) and a single value (String) are indistinguishable.

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