Master to main merge 9/3/2024

exercises/concept/freelancer-rates/lib/freelancer_rates.ex

@@ -1,17 +1,17 @@
 defmodule FreelancerRates do
   def daily_rate(hourly_rate) do
-    # Please implement the daily_rate/1 function
+    8.0*hourly_rate
   end
 
   def apply_discount(before_discount, discount) do
-    # Please implement the apply_discount/2 function
+    before_discount*(100-discount)*(1/100)
   end
 
   def monthly_rate(hourly_rate, discount) do
-    # Please implement the monthly_rate/2 function
+    ceil(apply_discount(8*22*hourly_rate, discount))
   end
 
   def days_in_budget(budget, hourly_rate, discount) do
-    # Please implement the days_in_budget/3 function
+    Float.floor(budget/apply_discount(daily_rate(hourly_rate), discount),1)
   end
 end

exercises/concept/lasagna/lib/lasagna.ex

@@ -1,11 +1,7 @@
 defmodule Lasagna do
-  # Please define the 'expected_minutes_in_oven/0' function
-
-  # Please define the 'remaining_minutes_in_oven/1' function
-
-  # Please define the 'preparation_time_in_minutes/1' function
-
-  # Please define the 'total_time_in_minutes/2' function
-
-  # Please define the 'alarm/0' function
+  def expected_minutes_in_oven(), do: 40
+  def remaining_minutes_in_oven(time_spent), do: expected_minutes_in_oven() - time_spent
+  def preparation_time_in_minutes(layers), do: 2*layers
+  def total_time_in_minutes(layers,time_spent), do: preparation_time_in_minutes(layers) + time_spent
+  def alarm(), do: "Ding!"
 end

exercises/concept/log-level/lib/log_level.ex

@@ -1,9 +1,23 @@
 defmodule LogLevel do
   def to_label(level, legacy?) do
-    # Please implement the to_label/2 function
+    cond do
+      level == 0 and not legacy? -> :trace
+      level == 1 -> :debug
+      level == 2 -> :info
+      level == 3 -> :warning
+      level == 4 -> :error
+      level == 5 and not legacy? -> :fatal
+      true -> :unknown
+    end
   end
 
   def alert_recipient(level, legacy?) do
-    # Please implement the alert_recipient/2 function
+    label = to_label(level,legacy?)
+    cond do
+      label in [:error,:fatal] -> :ops
+      label == :unknown && legacy? -> :dev1
+      label == :unknown -> :dev2
+      true -> false
+    end
   end
 end

exercises/concept/pacman-rules/lib/rules.ex

@@ -1,17 +1,14 @@
 defmodule Rules do
   def eat_ghost?(power_pellet_active?, touching_ghost?) do
-    # Please implement the eat_ghost?/2 function
+    power_pellet_active? and touching_ghost?
   end
-
   def score?(touching_power_pellet?, touching_dot?) do
-    # Please implement the score?/2 function
+    touching_power_pellet? or touching_dot?
   end
-
   def lose?(power_pellet_active?, touching_ghost?) do
-    # Please implement the lose?/2 function
+    not power_pellet_active? and touching_ghost?
   end
-
   def win?(has_eaten_all_dots?, power_pellet_active?, touching_ghost?) do
-    # Please implement the win?/3 function
+    has_eaten_all_dots? and not lose?(power_pellet_active?, touching_ghost?)
   end
 end

exercises/concept/secrets/lib/secrets.ex

@@ -1,29 +1,29 @@
 defmodule Secrets do
   def secret_add(secret) do
-    # Please implement the secret_add/1 function
+    &(&1 + secret)
   end
 
   def secret_subtract(secret) do
-    # Please implement the secret_subtract/1 function
+    &(&1 - secret)
   end
 
   def secret_multiply(secret) do
-    # Please implement the secret_multiply/1 function
+    &(&1*secret)
   end
 
   def secret_divide(secret) do
-    # Please implement the secret_divide/1 function
+    &(Integer.floor_div(&1,secret))
   end
 
   def secret_and(secret) do
-    # Please implement the secret_and/1 function
+    &(Bitwise.band(&1,secret))
   end
 
   def secret_xor(secret) do
-    # Please implement the secret_xor/1 function
+    &(Bitwise.bxor(&1,secret))
   end
 
   def secret_combine(secret_function1, secret_function2) do
-    # Please implement the secret_combine/2 function
+    &(secret_function2.(secret_function1.(&1)))
   end
 end

exercises/practice/hello-world/lib/hello_world.ex

@@ -4,6 +4,6 @@ defmodule HelloWorld do
   """
   @spec hello :: String.t()
   def hello do
-    "Goodbye, Mars!"
+    "Hello, World!"
   end
-end
+end