Finished HW with some bonuses

app.rb

@@ -0,0 +1,49 @@
+i = 1
+while i <= 100
+  if i % 3 ===0 
+    puts "Fizz"
+
+  elsif i % 5 === 0
+    puts "Buzz"
+
+    elsif i % 3 ===0 && i % 5 ===0
+        puts  "FizzBuzz"
+
+    else
+        puts i
+
+    end
+    i += 1
+end
+
+# planeteers = ["Earth", "Wind", "Captain Planet", "Fire", "Water"]
+
+# puts planeteers[1]
+
+# planeteers << "Heart"
+
+# puts planeteers
+
+# rangers = ["Red", "Blue", "Pink", "Yellow", "Black"]
+
+# heroes = planeteers + rangers
+
+# puts heroes.sort.inspect
+
+# puts heroes.rand
+
+# ninja_turtle = {
+#     name: "Michelangelo",
+#     weapon: "Nunchuks",
+#     radical: true
+# }
+
+# ninja_turtle = {:age => 15}
+
+# ninja_turtle.without(:radical)
+
+# ninja_turtle.store(:pizza_toppings, ["cheese", "pepperoni", "peppers"])
+
+# ninja_turtle.pizza_toppings[0]
+
+# ninja_turtle.to_a

data-collections.md

@@ -9,45 +9,45 @@ planeteers = ["Earth", "Wind", "Captain Planet", "Fire", "Water"]
 Access the second value in `planeteers`.
 
 ```rb
-# Your answer here
+planeteers[1] ==> accessing the second element
 ```
 
 Add "Heart" to the end of `planeteers`.
 
 ```rb
-# Your answer here
+planeteers << "Heart"
 ```
 
 Remove "Captain Planet" from the array (without using a method).
 
 ```rb
-# Your answer here
+planeteers -=["Captain Planet"]
 ```
 
 Combine `planeteers` with `rangers = ["Red", "Blue", "Pink", "Yellow", "Black"]` and save the result in a variable called `heroes`.
 
 ```rb
-# Your answer here
+heroes = planeteers + rangers ==> same as concat but without mutate
 ```
 
 Alphabetize the contents of `heroes` using a method. [The Ruby documentation might help](http://ruby-doc.org/core-2.2.0/Array.html).
 
 ```rb
-# Your answer here
+puts heroes.sort
 ```
 
 Randomize the contents of `heroes` using a method. [The Ruby documentation might help](http://ruby-doc.org/core-2.2.0/Array.html).
 
 ```rb
-# Your answer here
+puts heroes.shuffle
 ```
 
 #### Bonus
 
 Select a random element from `heroes` using a method. [The Ruby documentation might help](http://ruby-doc.org/core-2.2.0/Array.html).
 
 ```rb
-# Your answer here
+puts heroes.shuffle
 ```
 
 Select all elements in `heroes` that begin with "B" using a method. [The Ruby documentation might help](http://ruby-doc.org/core-2.2.0/Array.html).
@@ -61,37 +61,41 @@ Select all elements in `heroes` that begin with "B" using a method. [The Ruby do
 Initialize a hash called `ninja_turtle` with the properties `name`, `weapon` and `radical`. They should have values of "Michelangelo", "Nunchuks" and `true` respectively.
 
 ```rb
-# Your answer here
+ninja_turtle = {
+    name: "Michelangelo",
+    weapon: "Nunchuks",
+    radical: true
+}
 ```
 
 Add a key `age` to `ninja_turtle`. Set it to whatever numerical value you'd like.
 
 ```rb
-# Your answer here
+ninja_turtle = {:age => 15}
 ```
 
 Remove the `radical` key-value pair from `ninja_turtle`.
 
 ```rb
-# Your answer here
+ninja_turtle.delete(:radical)
 ```
 
 Add a key `pizza_toppings` to `ninja_turtle`. Set it to an array of strings (e.g., `["cheese", "pepperoni", "peppers"]`).
 
 ```rb
-# Your answer here
+inja_turtle.store(:pizza_toppings, ["cheese", "pepperoni", "peppers"])
 ```
 
 Access the first element of `pizza_toppings`.
 
 ```rb
-# Your answer here
+ninja_turtle.pizza_toppings[0]
 ```
 
 Produce an array containing all of `ninja_turtle`'s keys using a method. [The Ruby documentation might help](http://ruby-doc.org/core-1.9.3/Hash.html).
 
 ```rb
-# Your answer here
+ninja_turtle.to_a
 ```
 
 #### Bonus

data-types.md

@@ -10,59 +10,59 @@
 2 ** 3
 ```
 ```text
-Your answer.
+8 ==> 2 * 2 * 2
 ```
 
 ```rb
 ((16 / 4) * (2 + 1)) ** 2
 ```
 ```text
-Your answer.
+144 ==> 16/4 = 4, 2+1 = 3, 4*3 = 12, 12 * 12 = 144
 ```
 
 ```rb
 ("a milli " + "a milli") * 3
 ```
 ```text
-Your answer.
+a milli a millia milli a millia milli a milli ==> it would pritn it 3 times.
 ```
 
 ```rb
 ("a milli " * 4) / 2
 ```
 ```text
-Your answer.
+Error ==> because a milli is string and /2 is int
 ```
 
 ```rb
 my_favorite_number = 13
 puts "My favorite number is: " + my_favorite_number
 ```
 ```text
-Your answer.
+Error ==> + variableName means int and it would print string.
 ```
 
 ```rb
 my_favorite_number = 13
 puts "My favorite number is: #{my_favorite_number}"
 ```
 ```text
-Your answer.
+My favorite number is: 13 ==> because we put #{variableName}
 ```
 
 ### Truthiness and Falsiness
 
 #### Which of these evaluate as `false` in Ruby? Mark all that apply.
 
 ```text
-[ ] false
-[ ] 0
-[ ] ""
-[ ] null
-[ ] [ ] (empty array)
-[ ] undefined
-[ ] NaN
-[ ] nil
+[false] false
+[true ] 0
+[true ] ""
+[false ] null
+[false] [ ] (empty array)
+[false] undefined
+[false ] NaN
+[false ] nil
 ```
 
 #### What are the outputs and/or side effects of the following code snippets?
@@ -78,7 +78,7 @@ if no_name
 end
 ```
 ```text
-Your answer.
+My name is:  ==>> prints it empty.
 ```
 
 ```rb
@@ -88,7 +88,7 @@ if no_name
 end
 ```
 ```text
-Your answer.
+  ==> yes, nothing. Because the condition returns false
 ```
 
 ```rb
@@ -98,7 +98,7 @@ if age
 end
 ```
 ```text
-Your answer.
+Error ==> because age is int and the rest is string. If you want to print it, you should put #{age}
 ```
 
 ```rb
@@ -108,7 +108,7 @@ if age
 end
 ```
 ```text
-Your answer.
+My age is: "User Input" ==> gets = means wait for the user to put something, while chomp break the line.
 ```
 
 ### Conditionals