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  • Custom User Avatar

    This annoyed me as well. I just used a polyfill from MDN

  • Default User Avatar

    Its ranked 5kyu for a reason.
    It would be 7kyu if not for the performance tests.

  • Custom User Avatar

    The efficiency demand is kind of unfun. I enjoy practicing solving problems using fancy feautures such as generators but they aren't efficient enough and time-out.