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Roman Pushkin 2021-03-04 19:55:58 -08:00
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manuscript/quizzes.md
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@ -401,6 +401,18 @@ A: A quick way to define array of symbols
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===
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===
Q: Ruby gems are ...
A: Libraries created by developers from around the world with useful functionality
Q: To use a Ruby gem you must...
A: (two correct answers) 1) Install it from the command line 2) `require` gem in your program
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Q: What's the result of the following program?
```ruby
@ -414,6 +426,56 @@ puts arr[1][2] + arr[2][1]
A: 17
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Q: Consider this 3-dimensional array:
```ruby
arr = [
[
%w(a b c),
%w(d e f),
%w(g h i)
],
[
%w(aa bb cc),
%w(dd ee ff),
%w(gg hh ii)
]
]
```
What is the result of `arr[0][0][1] + arr[1][1][1] + arr[0][1][2]` expression?
A: beef
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Q: What is the result of `''.empty?` expression?
A: true
Q: What is the result of `''.nil?` expression and why?
A: false, because even empty strings are objects in Ruby (with the type of String), and objects can't be nils.
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Q: What is the result of the following expression?
```ruby
'HELLO'.size + %w(H E L L O).count { |x| x == 'L' }
```
A: 7
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===