to

Returns a substring from the beginning of the string to the given position. If the position is negative, it is counted from the end of the string.

str = "hello"
str.to(0)  #=> "h"
str.to(3)  #=> "hell"
str.to(-2) #=> "hell"

You can mix it with from method and do fun things like:

str = "hello"
str.from(0).to(-1) #=> "hello"
str.from(1).to(-2) #=> "ell"