Current progress

koans/about_control_statements.rb

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+require File.expand_path(File.dirname(__FILE__) + '/neo')
+
+class AboutControlStatements < Neo::Koan
+
+  def test_if_then_else_statements
+    if true
+      result = :true_value
+    else
+      result = :false_value
+    end
+    assert_equal __, result
+  end
+
+  def test_if_then_statements
+    result = :default_value
+    if true
+      result = :true_value
+    end
+    assert_equal __, result
+  end
+
+  def test_if_statements_return_values
+    value = if true
+              :true_value
+            else
+              :false_value
+            end
+    assert_equal __, value
+
+    value = if false
+              :true_value
+            else
+              :false_value
+            end
+    assert_equal __, value
+
+    # NOTE: Actually, EVERY statement in Ruby will return a value, not
+    # just if statements.
+  end
+
+  def test_if_statements_with_no_else_with_false_condition_return_value
+    value = if false
+              :true_value
+            end
+    assert_equal __, value
+  end
+
+  def test_condition_operators
+    assert_equal __, (true ? :true_value : :false_value)
+    assert_equal __, (false ? :true_value : :false_value)
+  end
+
+  def test_if_statement_modifiers
+    result = :default_value
+    result = :true_value if true
+
+    assert_equal __, result
+  end
+
+  def test_unless_statement
+    result = :default_value
+    unless false    # same as saying 'if !false', which evaluates as 'if true'
+      result = :false_value
+    end
+    assert_equal __, result
+  end
+
+  def test_unless_statement_evaluate_true
+    result = :default_value
+    unless true    # same as saying 'if !true', which evaluates as 'if false'
+      result = :true_value
+    end
+    assert_equal __, result
+  end
+
+  def test_unless_statement_modifier
+    result = :default_value
+    result = :false_value unless false
+
+    assert_equal __, result
+  end
+
+  def test_while_statement
+    i = 1
+    result = 1
+    while i <= 10
+      result = result * i
+      i += 1
+    end
+    assert_equal __, result
+  end
+
+  def test_break_statement
+    i = 1
+    result = 1
+    while true
+      break unless i <= 10
+      result = result * i
+      i += 1
+    end
+    assert_equal __, result
+  end
+
+  def test_break_statement_returns_values
+    i = 1
+    result = while i <= 10
+      break i if i % 2 == 0
+      i += 1
+    end
+
+    assert_equal __, result
+  end
+
+  def test_next_statement
+    i = 0
+    result = []
+    while i < 10
+      i += 1
+      next if (i % 2) == 0
+      result << i
+    end
+    assert_equal __, result
+  end
+
+  def test_for_statement
+    array = ["fish", "and", "chips"]
+    result = []
+    for item in array
+      result << item.upcase
+    end
+    assert_equal [__, __, __], result
+  end
+
+  def test_times_statement
+    sum = 0
+    10.times do
+      sum += 1
+    end
+    assert_equal __, sum
+  end
+
+end