Three alternative methods of looping in ruby to find the maximum number in an array.

largest.rb

def maximum(numbers)
    largest = numbers.first
    index = 0

    # keep looping over every element in the array
    while index < numbers.size

        # check to see if current number is larger than the largest one so far
        if numbers[index] > largest

            # if so, assign it as the largest value
            largest = numbers[index]
        end

        # move to the next element
        index += 1
    end

    return largest
end




# alternative looping for same algorithm
def maximum(numbers)
    largest = numbers.first

    # compare each number with the largest so far
    for index in 0..(numbers.size - 1)
        # puts "Index #{index}, value #{numbers[index]}"
        if numbers[index] > largest
            # puts "YES, larger"
            largest = numbers[index]
        end
    end

    return largest
end


# a more ruby-like method of looping
def maximum(numbers)
    largest = numbers.first

    # compare each number with the largest so far
    numbers.each do |number|
        # puts "Index #{index}, value #{numbers[index]}"
        if number > largest
            # puts "YES, larger"
            largest = number
        end
    end

    return largest
end