Mercurial > repos > other > SevenLanguagesInSevenWeeks
comparison 2-Io/day2-operators.io @ 37:86668d32e162
Add Day 2 code
| author | IBBoard <dev@ibboard.co.uk> |
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| date | Tue, 12 Sep 2017 20:58:51 +0100 |
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| 36:15eb99e79dd4 | 37:86668d32e162 |
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| 1 # Operators are syntactic sugar and can be listed from a table: | |
| 2 OperatorTable println | |
| 3 | |
| 4 # Creating an operator involves defining it with a precedence | |
| 5 # (index based on the output from the previous table) | |
| 6 OperatorTable addOperator("xor", 11) | |
| 7 | |
| 8 # And then implementing it on appropriate prototypes | |
| 9 # Note that Io is open-edit, like Ruby, so we can screw with core stuff | |
| 10 # like Booleans and extend them | |
| 11 true xor := method(bool, if(bool, false, true)) | |
| 12 false xor := method(bool, if(bool, true, false)) | |
| 13 | |
| 14 # For some reason I have to work out, the prints don't work here | |
| 15 # They print the second value. But running in REPL works and return correct | |
| 16 # value (before printing wrong one) | |
| 17 (true xor true) println | |
| 18 (true xor false) println | |
| 19 (false xor true) println | |
| 20 (false xor false) println | |
| 21 |