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37
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1 # Operators are syntactic sugar and can be listed from a table:
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2 OperatorTable println
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3
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4 # Creating an operator involves defining it with a precedence
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5 # (index based on the output from the previous table)
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6 OperatorTable addOperator("xor", 11)
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7
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8 # And then implementing it on appropriate prototypes
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9 # Note that Io is open-edit, like Ruby, so we can screw with core stuff
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10 # like Booleans and extend them
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11 true xor := method(bool, if(bool, false, true))
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12 false xor := method(bool, if(bool, true, false))
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13
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14 # For some reason I have to work out, the prints don't work here
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15 # They print the second value. But running in REPL works and return correct
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16 # value (before printing wrong one)
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17 (true xor true) println
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18 (true xor false) println
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19 (false xor true) println
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20 (false xor false) println
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21
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