[Swift] 2021 KAKAO BLIND RECRUITMENT 신규 아이디 추천

 

Solution

 

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Problem

 

코딩테스트 연습 - 신규 아이디 추천

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Source Code

 

	import Foundation
	func solution(_ new_id:String) -> String {
	var answer = new_id
	answer = step1(id: answer)
	answer = step2(id: answer)
	answer = step3(id: answer)
	answer = step4(id: answer)
	answer = step5(id: answer)
	answer = step6(id: answer)
	answer = step7(id: answer)
	return answer
	}
	func step1(id:String) -> String {
	return id.lowercased()
	}
	func step2(id:String) -> String {
	let specialCharaters = ["-","_","."]
	return id.filter{$0.isLetter || $0.isNumber || specialCharaters.contains(String($0))}.map{String($0)}.joined()
	}
	func step3(id:String) -> String {
	var newId = id
	while newId.contains("..") {
	newId = newId.replacingOccurrences(of: "..", with: ".")
	}
	return newId
	}
	func step4(id:String) -> String {
	var newId = id
	if newId.first == "." {
	newId.removeFirst()
	}
	if newId.last == "." {
	newId.removeLast()
	}
	return newId
	}
	func step5(id:String) -> String {
	return id.isEmpty ? "a" : id
	}
	func step6(id:String) -> String {
	var newId = id
	if newId.count >= 16 {
	newId = String(newId.prefix(15))
	newId = step4(id: newId)
	}
	return newId
	}
	func step7(id:String) -> String {
	if id.count == 1 {
	return String(id + id + id)
	}else if id.count == 2 {
	return String(id + String(id.last!))
	}
	return id
	}

view raw 신규 아이디 추천.swift hosted with ❤ by GitHub

 

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P.S

 

새롭게 알게된 것

 

isNumber

문자가 숫자인지 아닌지 확인해줌.

 

isLetter

문자인지 아닌지 확인해줌(특수문자 제외)