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# Forth Implement an evaluator for a very simple subset of Forth. [Forth](https://en.wikipedia.org/wiki/Forth_%28programming_language%29) is a stack-based programming language. Implement a very basic evaluator for a small subset of Forth. Your evaluator has to support the following words: - `+`, `-`, `*`, `/` (integer arithmetic) - `DUP`, `DROP`, `SWAP`, `OVER` (stack manipulation) Your evaluator also has to support defining new words using the customary syntax: `: word-name definition ;`. To keep things simple the only data type you need to support is signed integers of at least 16 bits size. You should use the following rules for the syntax: a number is a sequence of one or more (ASCII) digits, a word is a sequence of one or more letters, digits, symbols or punctuation that is not a number. (Forth probably uses slightly different rules, but this is close enough.) Words are case-insensitive. ## Setup Follow the setup instructions for Crystal here: http://exercism.io/languages/crystal More help installing can be found here: http://crystal-lang.org/docs/installation/index.html ## Making the Test Suit Pass Execute the tests with: ```bash $ crystal spec ``` In each test suite all but the first test have been skipped. Once you get a test passing, you can unskip the next one by changing `pending` to `it`. ## Submitting Incomplete Solutions It's possible to submit an incomplete solution so you can see how others have completed the exercise.
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74 entries across 74 versions & 1 rubygems