Ping Pong

Challenge Difficulty: Medium | Estimated completion time: ~15 minutes

A game of table tennis almost always sounds like Ping! followed by Pong!

You know that Player 2 won if you hear Pong! as the last sound (since Player 1 didn’t return the ball back).

Given an array of Ping!, create a function that inserts Pong! in between each element. Also:

• If win equals true, end the list with Pong!
• If win equals false, end the list with Ping!

Examples

#Example 1
pingPong(["Ping!"], True)
output = ["Ping!", "Pong!"]
 
#Example 2
pingPong(["Ping!", "Ping!"], False)
output = ["Ping!", "Pong!", "Ping!"]
 
#Example 3
pingPong(["Ping!", "Ping!", "Ping!"], True)
output = ["Ping!", "Pong!", "Ping!", "Pong!", "Ping!", "Pong!"]

Notes

• Player 1 serves the ball and makes Ping!.
• Return an array of strings.

Solution

Python

def pingPong(ping_array: list[str], win: bool) -> list[str]: """ Insert 'Pong!' between each 'Ping!' element and determine the final sound. Args: ping_array: List of strings containing 'Ping!' elements. win: Boolean indicating if Player 2 won (True) or Player 1 won (False). Returns: List with 'Pong!' inserted between each 'Ping!' and appropriate ending. Examples: >>> pingPong(["Ping!"], True) ['Ping!', 'Pong!'] >>> pingPong(["Ping!", "Ping!"], False) ['Ping!', 'Pong!', 'Ping!'] """ result = [] for ping_sound in ping_array: result.append(ping_sound) result.append("Pong!") # Remove the last "Pong!" if Player 1 won if not win: result.pop() return result if __name__ <span class="text-highlight"> "__main__": # Test cases assert pingPong(["Ping!"], True) </span> ["Ping!", "Pong!"] assert pingPong(["Ping!", "Ping!"], False) <span class="text-highlight"> ["Ping!", "Pong!", "Ping!"] assert pingPong(["Ping!", "Ping!", "Ping!"], True) </span> ["Ping!", "Pong!", "Ping!", "Pong!", "Ping!", "Pong!"] print("All test cases passed!")

Output