Python Coding challenge - Day 561| What is the output of the following Python Code?

 

Code Explanation:

1. Function Definition: apply_twice

def apply_twice(f):

    return lambda x: f(f(x))

This function takes another function f as input.

It returns a new function (a lambda) that applies f twice to any input x.

That is: f(f(x)).

2. Lambda Function Definition: f

f = lambda x: x + 3

This defines a simple function f that adds 3 to its input.

For example: f(2) returns 5, because 2 + 3 = 5.

3. Create New Function Using apply_twice

g = apply_twice(f)

Here, we pass the function f into apply_twice.

apply_twice(f) returns a function that applies f two times.

So, g(x) is equivalent to f(f(x)).

4. Calling the New Function g

print(g(2))

Let's break down what happens when we call g(2):

g(2) becomes f(f(2))

f(2) = 2 + 3 = 5

f(5) = 5 + 3 = 8

So, g(2) returns 8.

Final Output

8

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