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6 Implementing Array Grouping

It is now time to implement Array.prototype.groupBy.

Task 6.1

Your task is to write an implementation of the function Array.prototype.groupBy based on the specification and the knowledge you have gained in Modules 1-5.

There is no need to start on groupByToMap yet, as this can be implemented by just modifying the groupBy function (this is a part of Module 7).

Remember to adhere to the specification as much as possible. This makes it easier to ensure compliance the functionality outlined by the specification.

Tips:

  • Look at other implementations of previous features with similar specification.
  • Use Searchfox to search the codebase.
  • Create tests to test the functionality implemented.

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