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README.md
accumulate_test.rb

README.md

Ruby: Accumulate

Implement the accumulate operation, which, given a collection and an operation to perform on each element of the collection, returns a new collection containing the result of applying that operation to each element of the input collection.

Given the collection of numbers:

  • 1, 2, 3, 4, 5

And the operation:

  • square a number (x => x * x)

Your code should be able to produce the collection of squares:

  • 1, 4, 9, 16, 25

Check out the test suite to see the expected function signature.

Restrictions

Keep your hands off that collect/map/fmap/whatchamacallit functionality provided by your standard library! Solve this one yourself using other basic tools instead.

Lisp specific: it's perfectly fine to use MAPCAR or the equivalent, as this is idiomatic Lisp, not a library function.

The tests use the Minitest testing framework. To install it run the command:

gem install minitest

Run the tests with the ruby command:

ruby accumulate_test.rb

Resources

If you have never used Minitest, check out Intro to TDD tutorial from Jumpstart Lab.

Source

Conversation with James Edward Gray II https://twitter.com/jeg2

This exercise is from the Ruby track on Exercism

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