How is the model view controller framework used in ruby on rails?

 

1️⃣ Reverse a String

str = "Sadhna"

def reverse_str(str)
  reversed = ""
  str.each_char { |chr| reversed = chr + reversed }
  reversed
end

puts reverse_str(str)

---

2️⃣ Check if String is Palindrome

def palindrome?(str)
  reversed = ""
  str.each_char { |chr| reversed = chr + reversed }
  str == reversed
end

puts palindrome?("madam")   # true
puts palindrome?("ruby")    # false


3️⃣ Count Vowels in a String
def count_vowels(str)
  vowels = "aeiouAEIOU"
  count = 0
  str.each_char { |ch| count += 1 if vowels.include?(ch) }
  count
end

puts count_vowels("Sadhna")


4️⃣ Reverse an Array
def reverse_array(arr)
  reversed = []
  arr.each_index do |i|
    reversed << arr[arr.length - 1 - i]
  end
  reversed
end

puts reverse_array([1, 2, 3, 4]).inspect


5️⃣ Find Maximum in Array
def max_element(arr)
  max = arr[0]
  arr.each { |el| max = el if el > max }
  max
end

puts max_element([5, 9, 3, 7])


6️⃣ Find Minimum in Array
def min_element(arr)
  min = arr[0]
  arr.each { |el| min = el if el < min }
  min
end

puts min_element([5, 9, 3, 7])


7️⃣ Sum of Array Elements
def sum_array(arr)
  sum = 0
  arr.each { |el| sum += el }
  sum
end

puts sum_array([1, 2, 3, 4, 5])

8️⃣ Check if Number is Prime
def prime?(num)
  return false if num < 2
  (2...num).each { |i| return false if num % i == 0 }
  true
end

puts prime?(7)  # true
puts prime?(9)  # false


9️⃣ Factorial of a Number
def factorial(n)
  fact = 1
  (1..n).each { |i| fact *= i }
  fact
end

puts factorial(5)  # 120