remove a substring from a string at a specific index in ruby

You can remove a substring from a string at a specific index by using the slice! method. This method takes two arguments: the start index and the length of the substring to be removed. Here's an example:

main.rb
str = "Hello, World!"
str.slice!(7, 6)
puts str  # output: "Hello!"
68 chars
4 lines

In this example, we're removing the substring ", World" which starts at index 7 (counting from 0) and has a length of 6 characters.

Note that the slice! method modifies the original string, so if you need to keep the original string intact, you can create a copy of it and operate on the copy:

main.rb
original_str = "Hello, World!"
new_str = original_str.dup
new_str.slice!(7, 6)
puts new_str  # output: "Hello!"
puts original_str  # output: "Hello, World!"
157 chars
6 lines