Array+remove.swift

public extension Array {

    /// 通过item删除一个元素  <https://dbgrandi.github.io/removing_items_from_a_swift_array>
    ///
    /// - Parameter equalItem: 遵守 Equatable 协议的item
    /// - Returns: 是否删除
    @discardableResult
    mutating func remove<Element: Equatable>(equalItem: Element) -> Bool {
        var isRemoved = false
        for i in stride(from: self.count-1, through: 0, by: -1) {
            if let element = self[i] as? Element {
                if element == equalItem {
                    self.remove(at: i)
                    isRemoved = true
                }
            }
        }
        return isRemoved
    }

    /// 自定义删除规则
    ///
    /// - Parameter predicate: 删除规则
    /// - Returns: 是否删除
    @discardableResult
    mutating func removes(where predicate: (Array.Iterator.Element) -> Bool) -> Bool {
        var isRemoved = false
        for i in stride(from: self.count-1, through: 0, by: -1) {
            let element = self[i]
            if predicate(element) {
                remove(at: i)
                isRemoved = true
            }
        }
        return isRemoved
    }
}