feat: added examples_tutorials

py/examples_tutorials/lambda.py

@@ -0,0 +1,39 @@
+#!/usr/bin/env python3
+
+def square(x: int) -> int:
+    return x ** 2
+
+# Main function
+def main() -> None:
+    """
+    lambda: a one-liner anonymous function. in its simplest form, it just a function.
+    for example, the following can be rewritten with a add_1 function which returns x + 1
+    """
+    add_1 = lambda x: x + 1
+    result = add_1(1)
+    print(result)
+
+    """
+    map function: apply a function to every element in an iterable
+    returns a map object which can then be casted to a list
+    """
+    numbers = range(1,10)
+    # square is the function and numbers is the iterable where elements will be sent from
+    results = list(map(square, numbers))
+    print(results)
+
+    """
+    implement the same map function with lambda
+    """
+    results2 = list(map(lambda x: x ** 2, numbers))
+    print(results2)
+
+    """
+    filter function: apply function to every element. if true, keep the element. if false, reject it
+    """
+    even_numbers = list(filter(lambda x: x % 2 == 0, numbers))
+    print(even_numbers)
+
+# Call main function
+if __name__ == '__main__':
+    main()