find the last index of a character in a string in ruby

You can find the last index of a character in a string in Ruby by using the rindex method. The rindex method takes a character as an argument and returns the index of the last occurrence of that character in the string.

Here's an example:

main.rb
str = "hello world"
last_index = str.rindex("o")
puts last_index # Output: 7
77 chars
4 lines

In the example above, we use the rindex method to find the last index of the character "o" in the string "hello world". The last_index variable will hold the value 7, which is the index of the last occurrence of "o" in the string.

Note that the rindex method is case-sensitive, so if you want to search for a character regardless of case, you can convert the string and the search character to a common case before using the rindex method.