Idiosyncrätic
Ruby Quiz
idiosyncratic-ruby.com
Documenting lesser-known features in Ruby
Question 1
There is a String method that will generate the "successor" of a string
"aaa".succ #=> "aab"
What's the result of:
"9z".succ #=> ?
Question 1
"9z".succ #=> "10a"
Bonus Question 1
What's the result of:
"z9".succ #=> ?
Bonus Question 1
"z9".succ #=> "aa0"
Question 2
There is the concept of "bundled gems" in Ruby.
These will be installed alongside Ruby.
How many gems are bundled with Ruby 2.3?
Question 2
There is the concept of "bundled gems" in Ruby.
These will be installed alongside Ruby.
How many gems are bundled with Ruby 2.3?
6
Bonus Question 2
Which ones?
power_assert 0.2.6
test-unit 3.1.5
minitest 5.8.3
rake 10.4.2
net-telnet 0.1.1
did_you_mean 1.0.0
Question 3
There is a String#split method,
which also accepts regexes:
"rug-b".split(/-/) #=> ["rug", "b"]
What will happen if we use a capturing group in the regex?
"rug-b".split(/(-)/) #=> ?
Question 3
"rug-b".split(/(-)/) #=> ["rug", "-", "b"]
Bonus Question 3
What will happen if we use a multiple capturing groups?
"rug-b".split(/((-))/) #=> ?
Bonus Question 3
What will happen if we use a multiple capturing groups?
"rug-b".split(/((-))/) #=> ["rug", "-", "-", "b"]
Bonus Bonus
"rug-b".split(/(((((-)))))/)
#=> ["rug", "-", "-", "-", "-", "-", "b"]
"rug-b".split(/-(?=(.))/)
#=> ["rug", "b", "b"]