如何在Swift中删除String的重复行而不丢失它们的顺序？

uubf1zoe 于 11个月前发布在 Swift

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我想用Swift 3删除字符串中的重复行。我必须这样做，但不幸的是，在过程结束时，线路失去了秩序。下面是我的代码：

// string with 7 lines and 2 duplicates (MacBook and Mac mini)
var str = "MacBook\nMacBook Pro\nMacPro\nMacBook\niMac\nMac mini\nMac mini"

var components = str.components(separatedBy: .newlines)
print(components)

// remove duplicates: first by converting to a Set
// and then back to Array (found in iSwift.org)
components = Array(Set(components))
print(components)

let newStr = components.joined(separator: "\n")
print(newStr)

编辑：当删除重复时，我更喜欢保留第一个而不是最后一个。

swift

来源：https://stackoverflow.com/questions/42838086/how-to-remove-duplicates-of-lines-of-a-string-in-swift-without-lost-their-order

3条答案

按热度按时间

oewdyzsn1#

Tweaking @LeoDabus' comment.

let str = "MacBook\nMacBook Pro\nMacPro\nMacBook\niMac\nMac mini\nMac mini"
let components = str.components(separatedBy: .newlines)

let depDuped = components.reduce([]) {
    $0.0.contains($0.1) ? $0.0 : $0.0 + [$0.1]
}.joined(separator: "\n")

如果重复可以出现在字符串中的其他地方（因此"A\nB\nA"将保持不变），则

let depDuped = components.reduce([]) {
    $0.0.last == $0.1 ? $0.0 : $0.0 + [$0.1]
}.joined(separator: "\n")

赞(0）回复(0）举报 11个月前

6g8kf2rb2#

您可以使用NSOrderedSet。

var str = "MacBook\nMacBook Pro\nMacPro\nMacBook\niMac\nMac mini\nMac mini"

var components = str.components(separatedBy: .newlines)
print(components)

let orderedSet = NSOrderedSet(array: components)
components = orderedSet.array as! [String]
print(components)

let newStr = components.joined(separator: "\n")
print(newStr)

赞(0）回复(0）举报 11个月前

zf2sa74q3#

Swift 5更新来自@ashley-mills

let str = "MacBook\nMacBook Pro\nMacPro\nMacBook\niMac\nMac mini\nMac mini"
let components = str.components(separatedBy: .newlines)

let depDuped = components.reduce([]) {
    $0.contains($1) ? $0 : $0 + [$1]
}.joined(separator: "\n")

赞(0）回复(0）举报 11个月前

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如何在Swift中删除String的重复行而不丢失它们的顺序？

3条答案

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