Ruby 新人刚学 Ruby，请教下各位大神字符串取值的问题
a = "hello"
puts a[4,1] # => o
puts a[5,1] # => ""
puts a[6,1] # => nil
请问大佬们为啥 a[5,1] 是 "" 呢？
https://rubyapi.org/2.7/o/string#method-i-5B-5D
Additionally, an empty string is returned when the starting index for a character range is at the end of the string.
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piecehealth
piecehealth
➜ ~ ruby --version
ruby 3.2.0 (2022-12-25 revision a528908271) [x86_64-linux]
➜ ~ irb
irb(main):001:0> a = "hello"
=> "hello"
irb(main):002:0> a[5,1]
=> ""