Ruby Array Exercises: Check whether the value 2 appears in a given array of integers exactly 2 times, and no 2's are next to each other

Last update on December 21 2024 10:17:05 (UTC/GMT +8 hours)

Write a Ruby program to check whether the value 2 appears in a given array of integers exactly 2 times, and no 2's are next to each other.

Ruby Code:

def check_array(nums)
    count = 0
    i = 0
    if(nums.length >= 1 && nums[0] == 2)
        count = count + 1
    end    
   while i < nums.length
        if(nums[i - 1] == 2 && nums[i] == 2)
            return false
        end                    
        if(nums[i] == 2)
            count = count + 1
        end
        i= i + 1
   end
   return count == 3
end
print check_array([2, 1, 2, 5, 6]),"\n"
print check_array([2, 6, 5, 2, 3]),"\n"
print check_array([2, 5, 2, 3, 2]),"\n"

Output:

true
true
false

Flowchart:

Ruby Code Editor:

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