Confused In Nested Array Code

Question

Im just confused in to why I get an error when I explicitly specify the type of: challenges. I know type inference can determine its an array. But why would get an error?

var walkingChallenges: [String] = ["Walk 3 miles a day", "Beat every day goal"]
var runningChallenges: [String] = ["Run 5 miles a day", "Beat everyday goal"]

var challenges: [String] = [walkingChallenges, runningChallenges]

error: cannot convert value of type string to expected element type string.

The right way is to simply write:

var challenges = [walkingChallenges, runningChallenges]

Thanks!

Paulw11 · Accepted Answer · 2017-06-20 00:33:15Z

2

challenges needs to be of type [[String]] - it is an array of string arrays

You can either say

var challenges: [[String]] = [walkingChallenges, runningChallenges]

or

var challenges = [walkingChallenges, runningChallenges]

and let Swift infer the type

answered Jun 20, 2017 at 0:33

Paulw11

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