CODEWITHSUNDEEP
swiftdictionary
Curnelious
Curnelious

Reputation: 1

Find a maximum in array of dictionaries

I need to find the max value in [[String:Any]] array which looks like :

"date":someDate
"value":8
.
.

"date":anotherDate
"value":13
.

I need the max value(13), is there a simple way without the traditional looping over the array and extracting all numbers etc ?

Upvotes: 4

Views: 1081

Answers (1)

rmaddy
rmaddy

Reputation: 318854

Here's one possible solution using Array max(by:).

Note that this example uses a lot of crash operators (!). Safely unwrap as needed for your real code:

let data: [[String: Any]] = [
    ["date":Date(), "value":8],
    ["date":Data(), "value":13],
]

let maxEntry = data.max { ($0["value"] as! Int) < ($1["value"] as! Int) }!
let maxValue = maxEntry["value"] as! Int

Another option is to use map and max:

let maxValue = data.map { $0["value"] as! Int }.max()!

All these examples assume the array won't be empty and that each dictionary has a valid Int value for the "value" key. Adjust the code as needed if these assumptions are not valid.

Upvotes: 6

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