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annotate 2-Io/day2-reflection.io @ 71:32f018861e36

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Add Day 1 Erlang content
author IBBoard <dev@ibboard.co.uk>
date Fri, 02 Feb 2018 20:38:36 +0000
parents e8407d4e72dd
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e8407d4e72dd Add code on reflection - basically involves the object returned by "proto" message
IBBoard <dev@ibboard.co.uk>
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1 # Reflection in Io is about working out what goes on in slots
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2 # We're now going to create an "ancestors" method that we needed
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3 # on day 1 to find all slots!
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4 Object ancestors := method(
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5 # Store our prototype
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6 prototype := self proto
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7 # If we're not at the top
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8 if (prototype != Object,
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9 # Then print the type name as a header
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10 writeln("Slots of ", prototype type,"\n--------------------")
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11 # And iterate the slots with foreach() before printing with writeln()
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12 # TODO: Find the difference between println and writeln, other than "message vs function"
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13 prototype slotNames foreach(slotName, writeln(slotName))
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14 # Blank line
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15 writeln
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16 # Recurse!
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17 prototype ancestors
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18 )
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19 )
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20
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21 Animal := Object clone
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22 Animal speak := method("*ambiguous animal noise" println)
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23 Duck := Animal clone
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24 Duck speak := method("Quack-quack!" println)
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25 Duck walk := method("waddle" println)
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26 donald := Duck clone
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27 donald ancestors