Feature #15950
Updated by sawa (Tsuyoshi Sawada) almost 5 years ago
To take the first n characters of a string, using `[]` is straightforward: ```ruby "abcdefgh"[0, 3] # => "abc" ``` But to take the last n characters, we need to use n in two arguments: in the index (in negative form) in addition to the length: ```ruby "abcdefgh"[-3, 3] # => "fgh" ``` This is cumbersome. I wish negative length to be allowed, and be interpreted as measuring leftward (while cycling the receiver if necessary). ```ruby "abcdefgh"[0, -3] # => "fgh" "abcdefgh"[5, -3] # => "cde" ``` If there is not enough characters or elements, it should stop at the boundary. ```ruby "abcdefgh"[1, -3] # => "a" ```