Unique string

30 Dec 2020

Reading time ~1 minute

Given a string, determine if the string has all unique characters.

using System;
using System.Collections.Generic;

public class ArraysAndStrings
{
	public bool IsUnique(string str){
		Dictionary<char, bool> hash = new Dictionary<char, bool>();

		for(int i = 0; i< str.Length; i++){
			if(hash.ContainsKey(str[i])){
				return false;
			}

			hash[str[i]] = true;

		}
        return true;
    }
	}

A solution using Ruby:

def unique?(str)
	arr = str.split('')

	arr.length == arr.uniq.length
end