swift ) 프로그래머스 - 21카카오인턴 - 신규 아이디 추천

// 21KAKAO 신규 아이디 추천

import Foundation

func solution(_ new_id:String) -> String {

	let availList = ["a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s",
	"t","u","v","w","x","y","z","1","2","3","4","5","6","7","8","9","0","-","_","."]
	
	var id = new_id.lowercased().map{String($0)}
	
	var result = [String]()
	
	for i in 0..<id.count {
		if availList.contains(id[i]) {
			result.append(id[i])
		}
	}
	
	var index = 0
	
	while true {
		if index == result.count-1 {
			break
		}
		if result.count >= 2 {
			if result[index] == "." && result[index+1] == "." {
				result.remove(at:index)
				continue
			}
		} else {
			break
		}
		index += 1
		
	}

	while true {
		if result.first == "." {
			result.removeFirst()
			continue
		} else if result.last == "." {
			result.removeLast()
			continue
		}
		
		if result.count == 0 {
			result.append("a")
			continue
		}
		
		if result.count > 15 {
			result.removeLast(result.count-15)
			if result.last == "" {
				result.removeLast()
			}
			continue
		}
		
		if result.count < 3 {
			result.append(result.last!)
			continue
		}
		
		break
		
	}
	
	return result.joined()
}

// print(solution("...!@BaT#*..y.abcdefghijklm"))
//print(solution("z-+.^."))
//print(solution("=.="))
//print(solution("123_.def"))
//print(solution("abcdefghijklmn.p"))

 

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.filter 함수를 생각하지 못해서 그냥 배열 만들어버렸음..

그 외의 부분은 딱히 잘못되었다고 생각되는 부분은 없어보임