73 lines
2.5 KiB
Swift
73 lines
2.5 KiB
Swift
//
|
|
// Copyright (c) 2017 Touch Instinct
|
|
//
|
|
// Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
// of this software and associated documentation files (the "Software"), to deal
|
|
// in the Software without restriction, including without limitation the rights
|
|
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
// copies of the Software, and to permit persons to whom the Software is
|
|
// furnished to do so, subject to the following conditions:
|
|
//
|
|
// The above copyright notice and this permission notice shall be included in
|
|
// all copies or substantial portions of the Software.
|
|
//
|
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
// THE SOFTWARE.
|
|
//
|
|
|
|
public extension Array where Element: Equatable {
|
|
|
|
/// Union array with another arrays, without element duplication
|
|
func union(values: [Array.Element]...) -> Array {
|
|
var result = self
|
|
|
|
for array in values {
|
|
for value in array {
|
|
if !result.contains(value) {
|
|
result.append(value)
|
|
}
|
|
}
|
|
}
|
|
|
|
return result
|
|
}
|
|
|
|
/// Find common elements among arrays
|
|
func intersection(values: [Array.Element]...) -> Array {
|
|
var result = self
|
|
var intersection = Array()
|
|
|
|
for (index, value) in values.enumerated() {
|
|
if index > 0 {
|
|
result = intersection
|
|
intersection = Array()
|
|
}
|
|
|
|
value.forEach { item in
|
|
if result.contains(item) && !intersection.contains(item) {
|
|
intersection.append(item)
|
|
}
|
|
}
|
|
}
|
|
|
|
return intersection
|
|
}
|
|
|
|
/// Find unique elements in array compared to other arrays
|
|
func subtract(values: [Array.Element]...) -> Array {
|
|
let allValues = values.flatMap { $0 }
|
|
return filter { !allValues.contains($0) }
|
|
}
|
|
|
|
// Subscript for safe access to element by index
|
|
subscript(safe index: Index) -> Element? {
|
|
return index < count ? self[index] : nil
|
|
}
|
|
|
|
}
|