Swift Arrays

// Make array from properties of another array
let ids = array.map { $0.id }



// Filter duplicate items from array based on specific properties
extension Array {
    func filterDuplicate<T>(_ keyValue:(Element)->T) -> [Element] {
        var uniqueKeys = Set<String>()
        return filter{uniqueKeys.insert("\(keyValue($0))").inserted}
    }
}
let filtered = objectsArray.filterDuplicate{ ($0.name,$0.age) }



// Filter array by property values
let find = items.filter({["value 1", "value 2"].contains($0.propertyName)})



/**
 Splits an array into smaller
 
 let array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]
 print(array.spliyBy(5)) // [[1, 2, 3, 4, 5], [6, 7, 8, 9, 10], [11, 12]]
 */
extension Array {
    func splitBy(_ chunkSize: Int) -> [[Element]] {
        return stride(from: 0, to: self.count, by: chunkSize).map {
            Array(self[$0..<Swift.min($0 + chunkSize, self.count)])
        }
    }
}