exercism/lua/accumulate/README.md

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2016-08-13 23:20:14 +00:00
# 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.
For example, given the collection of numbers:
- 1, 2, 3, 4, 5
And the operation:
- square a number
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.
Elixir specific: it's perfectly fine to use `Enum.reduce` or
`Enumerable.reduce`.
Lisp specific: it's perfectly fine to use `MAPCAR` or the equivalent,
as this is idiomatic Lisp, not a library function.
### Getting started
First install lua and [luarocks][2] using [homebrew][1]
$ brew install lua
Then install [busted][3] testing framework for lua
$ luarocks install busted
Then run your test
$ busted bob_test.lua
Other resources
1. [Lua Style Guide][4]
2. [Learn Lua in 15 minutes][5]
[1]: http://brew.sh/
[2]: http://luarocks.org/
[3]: http://olivinelabs.com/busted/
[4]: https://github.com/Olivine-Labs/lua-style-guide
[5]: http://tylerneylon.com/a/learn-lua/
## Source
Conversation with James Edward Gray II [view source](https://twitter.com/jeg2)