how to add array of elements to key in swift 5 code example

Example 1: array swift

var students = ["Ben", "Ivy", "Jordell"]

Example 2: how to get list of value from specific keys in array object in swift

import Foundation

let strings = [
    "one",
    "two",
    "three"
]

let ints = strings.map { (string) -> Int in
    return string.count
}