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joeegan/advent0.js

Last active December 2, 2017 17:14
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advent0.js
const testCases = [
['1122', 3],
['1111', 4],
['1234', 0],
['91212129', 9]
]
const isDoubler = (n, i, arr) =>
or (
equals(arr[inc(i)], n),
and(
equals(i, dec(length(arr))),
equals(head(arr), n)
)
)
const sumOfDoubles = pipe(
compose(map(Number), split(''), String),
arr => arr.reduce((acc, n, i) => isDoubler(n, i, clone(arr)) ? add(acc, n) : acc, 0)
)
testCases.every(([n, answer]) => equals(sumOfDoubles(n), answer))
sumOfDoubles('181445682966897848665963472661939865313976877194312684993521259486517527961396717561854825453963181134379574918373213732184697746668399631642622373684425326112585283946462323363991753895647177797691214784149215198715986947573668987188746878678399624533792551651335979847131975965677957755571358934665327487287312467771187981424785514785421781781976477326712674311994735947987383516699897916595433228294198759715959469578766739518475118771755787196238772345762941477359483456641194685333528329581113788599843621326313592354167846466415943566183192946217689936174884493199368681514958669615226362538622898367728662941275658917124167353496334664239539753835439929664552886538885727235662548783529353611441231681613535447417941911479391558481443933134283852879511395429489152435996669232681215627723723565872291296878528334773391626672491878762288953597499218397146685679387438634857358552943964839321464529237533868734473777756775687759355878519113426969197211824325893376812556798483325994128743242544899625215765851923959798197562831313891371735973761384464685316273343541852758525318144681364492173465174512856618292785483181956548813344752352933634979165667651165776587656468598791994573513652324764687515345959621493346623821965554755615219855842969932269414839446887613738174567989512857785566352285988991946436148652839391593178736624957214917527759574235133666461988355855613377789115472297915429318142824465141688559333787512328799783539285826471818279818457674417354335454395644435889386297695625378256613558911695145397779576526397241795181294322797687168326696497256684943829666672341162656479563522892141714998477865114944671225898297338685958644728534192317628618817551492975251364233974374724968483637518876583946828819994321129556511537619253381981544394112184655586964655164192552352534626295996968762388827294873362719636616182786976922445125551927969267591395292198155775434997827738862786341543524544822321112131815475829945625787561369956264826651461575948462782869972654343749617939132353399334744265286151177931594514857563664329299713436914721119746932159456287267887878779218815883191236858656959258484139254446341')
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