Iteration

about_iteration.rb

@@ -12,7 +12,7 @@ def test_iterating_with_each
     array.each do |item|
       sum += item
     end
-    assert_equal __, sum
+    assert_equal 6, sum
   end
 
   def test_each_can_use_curly_brace_blocks_too
@@ -21,7 +21,7 @@ def test_each_can_use_curly_brace_blocks_too
     array.each { |item|
       sum += item
     }
-    assert_equal __, sum
+    assert_equal 6, sum
   end
 
   def test_break_works_with_each_style_iterations
@@ -31,42 +31,42 @@ def test_break_works_with_each_style_iterations
       break if item > 3
       sum += item
     }
-    assert_equal __, sum
+    assert_equal 6, sum
   end
 
   def test_collect_transforms_elements_of_an_array
     array = [1, 2, 3]
     new_array = array.collect { |item| item + 10 }
-    assert_equal __, new_array
+    assert_equal [11, 12, 13], new_array
 
     # NOTE: 'map' is another name for the 'collect' operation
     another_array = array.map { |item| item + 10 }
-    assert_equal __, another_array
+    assert_equal [11, 12, 13], another_array
   end
 
   def test_select_selects_certain_items_from_an_array
     array = [1, 2, 3, 4, 5, 6]
 
     even_numbers = array.select { |item| (item % 2) == 0 }
-    assert_equal __, even_numbers
+    assert_equal [2, 4, 6], even_numbers
 
     # NOTE: 'find_all' is another name for the 'select' operation
     more_even_numbers = array.find_all { |item| (item % 2) == 0 }
-    assert_equal __, more_even_numbers
+    assert_equal [2, 4, 6], more_even_numbers
   end
 
   def test_find_locates_the_first_element_matching_a_criteria
     array = ["Jim", "Bill", "Clarence", "Doug", "Eli"]
 
-    assert_equal __, array.find { |item| item.size > 4 }
+    assert_equal "Clarence", array.find { |item| item.size > 4 }
   end
 
   def test_inject_will_blow_your_mind
     result = [2, 3, 4].inject(0) { |sum, item| sum + item }
-    assert_equal __, result
+    assert_equal 9, result
 
     result2 = [2, 3, 4].inject(1) { |sum, item| sum * item }
-    assert_equal __, result2
+    assert_equal 24, result2
 
     # Extra Credit:
     # Describe in your own words what inject does.
@@ -75,12 +75,12 @@ def test_inject_will_blow_your_mind
   def test_all_iteration_methods_work_on_any_collection_not_just_arrays
     # Ranges act like a collection
     result = (1..3).map { |item| item + 10 }
-    assert_equal __, result
+    assert_equal [11, 12, 13], result
 
     # Files act like a collection of lines
     File.open("example_file.txt") do |file|
       upcase_lines = file.map { |line| line.strip.upcase }
-      assert_equal __, upcase_lines
+      assert_equal ['THIS', 'IS', 'A', 'TEST'], upcase_lines
     end
 
     # NOTE: You can create your own collections that work with each,