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[ 0 => '{{DISPLAYTITLE:Pyramid Scheme}}', 1 => '{{infobox proglang', 2 => '|name=Pyramid Scheme', 3 => '|paradigms=declarative', 4 => '|author=Conor O'Brien', 5 => '|year=[[:Category:2017|2017]]', 6 => '|class=[[:Category:Turing complete|Turing complete]]', 7 => '|refimpl=[https://github.com/ConorOBrien-Foxx/Pyramid-Scheme]', 8 => '|influence=[[Lisp]]', 9 => '|files=<code>.pyr</code>, <code>.pyra</code>', 10 => '}}', 11 => '', 12 => 'Pyramid Scheme is an [[esoteric programming language]] created by [https://github.com/ConorOBrien-Foxx Conor O'Brien] in early 2017. It is a dialect of [[Lisp]], but it uses ascii-art pyramid structures as opposed to brackets.', 13 => '', 14 => '== Entymology ==', 15 => '', 16 => 'The name is a joke on the name of a different Lisp dialect called [https://en.wikipedia.org/wiki/Scheme_(programming_language) Scheme], and its similarity to a (widely frowned-upon and illegal) business model called the [https://en.wikipedia.org/wiki/Pyramid_scheme pyramid scheme].', 17 => '', 18 => '== Sample programs ==', 19 => '', 20 => '=== If/Else statement ===', 21 => '', 22 => 'The following is an implementation of an if-else statement in pyramid scheme. It prints if A is 1 for truthy, and 0 if it is falsey', 23 => '', 24 => ' ^ ^', 25 => ' / \ / \', 26 => ' /set\ / \', 27 => ' ^-----^ / ? \', 28 => ' /A\ /1\ ^-------^', 29 => ' --- --- /!\ / \', 30 => ' ^--- /out\', 31 => ' / \ ^-----', 32 => ' / ? \ /0\', 33 => ' ^-----^ ---', 34 => ' /A\ / \', 35 => ' --- /out\', 36 => ' ^-----', 37 => ' /1\', 38 => ' ---', 39 => '', 40 => 'This is equivalent to the lisp-like syntax:', 41 => '', 42 => ' (set A 1)', 43 => ' (? (! (? A (out 1))) (out 0))', 44 => '', 45 => '=== Modulo function ===', 46 => '', 47 => 'Pyramid scheme does not have an implementation of the modulo function. A modulo of a number has to, therefore, be calculated with repeated subtraction. The following implements the ''mod(a,b)'' function:', 48 => '', 49 => ' ^ ^ ^ ^', 50 => ' / \ / \ / \ / \', 51 => ' /set\ /set\ / \ /out\', 52 => ' ^-----^ ^-----^ / \ -----^', 53 => ' /a\ / \ /b\ / \ / \ /a\', 54 => ' --- /33 \--- /16 \ / loop \ ---', 55 => ' ----- ----- ^-----------^', 56 => ' / \ / \', 57 => ' / \ /set\', 58 => ' / <=> \ ^-----^', 59 => ' ^-------^ /a\ /-\', 60 => ' / \ / \ --- ^---^', 61 => ' /<=>\ /-1 \ /a\ /b\', 62 => ' ^-----^ ----- --- ---', 63 => ' /a\ /b\', 64 => ' --- ---', 65 => '', 66 => 'which is equivalent to lisp-like:', 67 => '', 68 => ' (set a 33)', 69 => ' (set b 16)', 70 => ' (loop (<=> (<=> a b) -1) (set a (- a b)))', 71 => ' (out a)', 72 => '', 73 => '== External resources ==', 74 => '', 75 => '* [https://github.com/ConorOBrien-Foxx/Pyramid-Scheme Pyramid Scheme] on GitHub', 76 => '* [https://tio.run/##rZFBCoQwDEX3PcW/gLTRgh5GBFHBWYiDowtPX22chZVuismir/lJCj/97ks7ffrs143DNDgHNOAIENNSoKBR@1uAmJYGpedtPZMAMS0VKvPRIACfeAcFEeOPNXh041KL4nxVxPJzAeLudZn7RJOhCxWDOLOWa8XVUpW41YjsfcAY7izw/35AEM4d Hello world in Pyramid Scheme] on TIO' ]