In this tutorial, we are going to learn about how to get the first n characters of a string in Ruby.
Consider, we have the following string:
month = "august"
Now, we want to get the first 3 characters
aug from the above string.
To access the first n characters of a string in ruby, we can use the square brackets syntax
 by passing the start index and length.
Here is an example, that gets the first 3 characters from the
month = "august" firstThree = month[0, 3] puts firstThree
In the example above, we have passed the [0, 3] to it. so it starts the extraction at index position
0, and extracts before the position