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ch-1.swift
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import Foundation
/*
Week 180:
https://theweeklychallenge.org/blog/perl-weekly-challenge-180
Task #1: First Unique Character
You are given a string, $s.
Write a script to find out the first unique character in the
given string and print its index (0-based).
ACTION:
$ swift ch-1.swift 'Perl Weekly Challenge'
$ swift ch-1.swift 'Long Live Perl'
*/
enum ParamError: Error {
case missingString
}
do {
let paramCount:Int = Int(CommandLine.argc)
if paramCount <= 1 {
throw ParamError.missingString
}
let str: String = CommandLine.arguments[1]
var chars: [Character] = [Character]()
var dicts = [Character:Int]()
for var char: Character in Array(str) {
if char == " " {
continue
}
char = char.toLower()
if let _: Int = dicts[char] {
dicts[char]! += 1
}
else {
chars.append(char)
dicts[char] = 1
}
}
var i:Int = 0;
for char in chars {
if dicts[char]! == 1 {
print(i)
break
}
i += 1
}
}
catch ParamError.missingString {
print("Missing string.")
}
catch let error {
print(error)
}
extension Character {
func toLower() -> Character {
return String(self).lowercased().first!
}
}