ruby find index of element in array

# Given array
arr = [10, 20, 30, 40, 50]

# Element to find index for
element_to_find = 30

# Using the `index` method to find the index of the element
index_of_element = arr.index(element_to_find)

# Displaying the result
puts "Index of #{element_to_find} in the array is: #{index_of_element}"