NFT Collection Review - codepath/compsci_guides GitHub Wiki

Unit 4 Session 1 Standard (Click for link to problem statements)

U-nderstand

Understand what the interviewer is asking for by using test cases and questions about the problem.

• Q: What is the structure of the input?

  • A: The input is a list of dictionaries, where each dictionary represents an NFT and contains keys such as "name", "creator", and "value".

• Q: What is the output?

  • A: The output is a list of names (strings) extracted from each dictionary in the input list.

• Q: What should the function return if the input list is empty?

  • A: The function should return an empty list.

• Q: What is the problem in the provided code?

  • A: The issue is with the use of the += operator, which concatenates each character of the name string individually to the list, resulting in a list of characters instead of a list of full names.

P-lan

Plan the solution with appropriate visualizations and pseudocode.

General Idea: Correct the method used to add names to the list. Instead of concatenating characters, we should append the entire string to the list.

1) Identify the incorrect usage of `+=` in the code.
2) Replace it with the `append()` method to ensure the full name string is added to the list.
3) Test the function with the provided examples to ensure correctness.

**⚠️ Common Mistakes**

- Using `+=` with a list and a string can lead to unintended behavior where each character of the string is added separately to the list.

I-mplement

def extract_nft_names(nft_collection):
    nft_names = []
    for nft in nft_collection:
        nft_names.append(nft["name"])
    return nft_names