//
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// DictionaryExtensition.swift
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// ExhibitionProject
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//
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// Created by alvin_y on 2019/1/25.
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// Copyright © 2019 yang-wang. All rights reserved.
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//
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import Foundation
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func += <K,V> ( left: inout Dictionary<K,V>, right: Dictionary<K,V>?) {
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guard let right = right else { return }
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right.forEach { key, value in
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left.updateValue(value, forKey: key)
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}
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}
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extension Dictionary {
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mutating func append(dict: Dictionary) {
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dict.forEach { (key, value) in
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self.updateValue(value, forKey: key)
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}
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}
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}
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extension Dictionary{
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func dictionaryToJson() -> String? {
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do {
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let jsonData = try JSONSerialization.data(withJSONObject: self, options: .prettyPrinted)
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return String.init(data: jsonData, encoding: .utf8) ?? nil
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} catch {
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print(error.localizedDescription)
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return nil
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}
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}
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}
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extension Array {
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// 去重
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func filterDuplicates<E: Equatable>(_ filter: (Element) -> E) -> [Element] {
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var result = [Element]()
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for value in self {
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let key = filter(value)
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if !result.map({filter($0)}).contains(key) {
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result.append(value)
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}
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}
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return result
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}
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}
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