I have an Array of Dictionaries.
The Dictionary is like ["date":"2017-07-03T10:12:00", "amount":2.1].
EDIT
Let's say, I have the following array.
let dic1 = ["date":"2017-07-03T10:12:00", "amount":2.0]
let dic2 = ["date":"2017-07-03T11:15:03", "amount":4.0]
let dic3 = ["date":"2017-07-03T17:05:04", "amount":1.0]
let dic4 = ["date":"2017-07-04T09:05:03", "amount":3.0]
let dic5 = ["date":"2017-07-04T12:01:22", "amount":5.0]
let dic6 = ["date":"2017-07-04T19:01:01", "amount":2.0]
let array = [dic1, dic2, dic3, dic4, dic5, dic6]
Now I'm trying to calculate the following result from Array.
"date":"2017-07-03", "average":3.5
"date":"2017-07-04", "average":5.0
"date":"2017-07", "average":2.82..
"date":"2017", "average":2.82..
I could get the average of all data with the following code but I'm stuck now.
let average = array.flatMap({ $0["amount"] as? Double }).reduce(0, +) / Double(array.count)