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Add SICP Ex 4.33 solution #1

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ff89caf
Add SICP Ex 4.33 solution
Apr 4, 2020
9ea98be
Fix example correctness
anubh-v Apr 11, 2020
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26 changes: 26 additions & 0 deletions src/examples/liars.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,26 @@
function distinct(items) {
return is_null(items)
? true
: is_null(tail(items))
? true
: is_null(member(head(items), tail(items)))
? distinct(tail(items))
: false;
}

const betty = amb(1, 2, 3, 4, 5);
const ethel = amb(1, 2, 3, 4, 5);
const joan = amb(1, 2, 3, 4, 5);
const kitty = amb(1, 2, 3, 4, 5);
const mary = amb(1, 2, 3, 4, 5);

require(amb(kitty === 2, betty === 3));
require(amb(ethel === 1, joan === 2));
require(amb(joan === 3, ethel === 5));
require(amb(kitty === 2, mary === 4));
require(amb(mary === 4, betty === 1));

require(distinct(list(betty, ethel, joan, kitty, mary)));

list(list('betty', betty), list('ethel', ethel), list('joan', joan),
list('kitty', kitty), list('mary', mary));