Implementing Stack data structure with TDD (Kata 2)

Code from the video:
https://github.com/GA1/youtube-videos...

Find more about stacks here:
  / implementing-stack-with-javascript-and-tdd  

Repo used in the video as a starter project:
https://github.com/GA1/algo-tdd-starters

Find more about the repo at:
  / e02ecf357892  

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