Removing the last n characters of a string in Ruby

In this tutorial, we are going to learn about how to remove the last n characters of a string in Ruby.

Consider, we have the following month string:

month = "september"

Now, we need to remove the last 3 "ber" characters from the end of a string.

Removing last n characters

To remove the last n characters of a string, we can use the built delete_suffix!() method in Ruby.

The delete_suffix!() method takes the last n characters as an argument and returns the copy of a string by deleting it.

Here is an example, that removes the last 3 characters from the month string:

month = "september"
month.delete_suffix!("ber")

puts month

Output:

"septem"

Similarly, we can also use the slice! method in Ruby.

Example:

month = "september"
month.slice!(-3,3)

puts month

In the above code, we have passed -3, 3 as an arguments to the slice! method. so it removes the last 3 characters from the end of a string.

Note: In ruby, the negative index starts from the end of a string. for example -1 is the last character index.