Find the first non-repeated character in a String in ruby

This is the most frequently asked ruby interview question for the entry-level engineer.

There are many ways to find the first non-repeated character in the ruby with the help of a few inbuilt methods we can achieve this easily.

Method 1

def first_non_repeated_character(input)
    output = ''
    input.chars do |c|
        input.count(c) == 1 ? (output = c; break) : output = '' 
    end
    output
end

output

input = 'This is the example of first non-repeated character'.downcase
puts first_non_repeated_character(input) #=> x

Method 2

def first_non_repeated_character(input)
    input.chars.find { |character| input.count(character) == 1 }
end

output

input = 'This is the example of first non-repeated character'.downcase
puts first_non_repeated_character(input) #=> x

Method 3

def first_non_repeated_character(input)
    input.chars.detect { |character| input.count(character) == 1 }
end

output

input = 'This is the example of first non-repeated character'.downcase
puts first_non_repeated_character(input) #=> x

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