How to split an array in half, and obtain two arrays-CodePudding

as per title, I want to split an array in two half, and then assign each half of the original array into two different string. I cannot do the first part. I have this code for the splitting:

finalPlayers = players.shuffled()
let teams = finalPlayers.split()
test1 = teams.left
test2 = teams.right
firstTeam = test1.joined(separator: ", ")
secondTeam = test2.joined(separator: ", ")

The split() method is an extension of array:

extension Array {
    func split() -> (left: [Element], right: [Element]) {
        let ct = self.count
        let half = ct / 2
        let leftSplit = self[0 ..< half]
        let rightSplit = self[half ..< ct]
        return (left: Array(leftSplit), right: Array(rightSplit))
    }
}

The result of this code is just an half of the original array, and not both half, the two strings have the same value.

Expected behavior: If I have the array people = ["Mark", "Jennifer", "Laura", "Paul"] I want two string firsString = "Mark, Jennifer and secondString = "Laura, Paul

Thanks for your time, I hope it is clear, if not add a comment.

CodePudding user response：

Try This:

let namesArray = ["Mark","Jennifer","Laura","Paul"]
let splittedArray = namesArray.devided()
let firstString = splittedArray.0.joined(separator: ", ")
let secondString = splittedArray.1.joined(separator: ", ")

print(firstString)
print(secondString)


extension Array {
    func devided() -> ([Element], [Element]) {
        let half = count / 2   count % 2
        let head = self[0..<half]
        let tail = self[half..<count]

        return (Array(head), Array(tail))
    }
}


Output:
Mark, Jennifer
Laura, Paul

CodePudding user response：

As others have commented, you don't appear to actually have a problem.

Still, you may want to know about chunks.

import Algorithms

public extension Collection {
  /// - Note: The first "half" will be longer by one element,
  /// if `count` is odd.
  var splitInHalf: ChunksOfCountCollection<Self> {
    let (halfCount, remainder) = count.quotientAndRemainder(dividingBy: 2)
    return chunks(ofCount: halfCount   remainder)
  }
}

CodePudding user response：

Divide array into two array

    let people = ["Mark","Jennifer","Laura","Paul"];
    let middleIndex = ceil(Double(people.count/2));

    let firstHalf = people.dropFirst(Int(middleIndex))
    let secondHalf = people.dropLast(Int(firstHalf.count));

    print(firstHalf);  // ["Laura", "Paul"]
    print(secondHalf); // ["Mark", "Jennifer"]

CodePudding user response：

func splitAndConcat(array: [String]) -> [String] {
    let length: Int = array.count
    let middleIndex: Int = length / 2
    
    let firstHalf = array[...(middleIndex - 1)]
    let secondHalf = array[middleIndex...]
    return [firstHalf.joined(separator: ", "), secondHalf.joined(separator: ", ")]
}
var names = ["Mark", "Jennifer", "Laura", "Paul"]
splitAndConcat(array: names) // ["Mark, Jennifer", "Laura, Paul, kartik"]