Feat: Added the missing exercises.

Author: jamallaqdiem

prep-exercises/double-exercise.py

@@ -0,0 +1,26 @@
+def half(value):
+    return value / 2 
+
+def double(value):
+    return value * 2 
+
+def second(value):
+    return value[1]
+
+
+print(half(22))
+print(half("hello"))
+print(half("22"))
+
+
+print(double(22))
+print(double("hello"))
+print(double("22"))
+
+print(second(22))
+print(second(0x16))
+print(second("hello"))
+print(second("22"))
+
+# I expected the double("22"), my prediction was wrong, I expected that it will behave like javascript (smart enough to convert it to number but risky)
+# however python will not change type to int and will just double the string ("2222"), because python is strongly typed.

prep-exercises/limit-types.py

@@ -0,0 +1,8 @@
+def double(number):
+    return number * 3
+
+print(double(10))
+
+# The bug is that method naming(double), as this method is multiplying the number by 3, should be named triple, to make sense of the method scope,
+# and show other developers what is the purpose of it even before reading the code.
+# Or we can change the multiplied by number from 3 to 2 to match the correct meaning of the method.

prep-exercises/methods.py

@@ -2,6 +2,10 @@
 
 # this is similar to new Date() object in js, but only getting the date not hours etc.
 
+      # The core method advantages over free functions:
+# 1. Methods belong to a class, preventing naming conflicts with other parts of our program.
+# 2. Method syntax like car.drive() reads naturally like a noun performing an action, making code easier to follow
+# 3. Different classes can use the exact same method name to perform distinct, specialized actions.
 class Person:
     def __init__(self, name: str, preferred_os: str, dob: dt.date):
         self.name = name