Kevin Wang knwang

Ruby and General Programming:

What is a class? What is an object? What are the differences in Ruby?
Are instance variables available to class methods?
What are the differences between blocks, procs and lambdas in Ruby?
Write a method that sorts the keys in a hash by the length of the key as a string. For instance, the hash:
```
{ abc: 'hello', 'another_key' => 123, 4567 => 'third' }
```

::new
*
+
<<
<=>
==
=~

==
[key]
[key]=
any?
any? {|key, value| ...}
delete(key)
delete(key) {|key| ..}

::new
*
+
-
<=>
==
<<

	class MySet
	end

	require 'minitest/autorun'
	class TestMySet < Minitest::Test
	def test_empty_set_should_have_size_0
	end

	def test_initialize_with_an_array
	end