Ef \u00fe\u00fa ert n\u00fdr h\u00e9r skaltu ganga \u00far skugga um a\u00f0 sko\u00f0a s\u00ed\u00f0ustu tvo hluta m\u00edna um virkniforritun \u00e1 The Codest<\/a> Blogg um:<\/p>\n\n\n\n \u00dea\u00f0 hefur enga fl\u00f3kna r\u00f6kfr\u00e6\u00f0i. A\u00f0alverkefni \u00feess er a\u00f0 umlykja samhengi og framkv\u00e6ma \u00fe\u00e6r a\u00f0ger\u00f0ir sem \u00fea\u00f0 f\u00e6r fr\u00e1 utana\u00f0komandi \u00e1 \u00fev\u00ed. \u00cd hvert sinn sem gildi\u00f0 breytist er n\u00fd eining af \u00edl\u00e1ti endurpakku\u00f0 og skilu\u00f0. \u00deegar kalla\u00f0 er \u00e1 kort<\/b> a\u00f0fer\u00f0 sem framkv\u00e6mir tiltekna a\u00f0ger\u00f0 skilar n\u00fdrri \u00edl\u00e1tseiningu me\u00f0 gildinu sem skila\u00f0 var af f\u00e6r\u00f0u falli, \u00e1 sama t\u00edma og \u00f3breytanleikareglunni er haldi\u00f0.<\/p>\n\n\n\n kort<\/b> \u2013 gagnlegt \u00feegar \u00fe\u00fa vilt breyta \u00e1standi gildis \u00ed \u00edl\u00e1ti en vilt ekki skila \u00fev\u00ed enn\u00fe\u00e1.<\/p>\n\n\n\n ke\u00f0ja<\/b> \u2013 nota\u00f0 \u00feegar \u00fe\u00fa vilt senda gildi \u00ed fall \u00e1n \u00feess a\u00f0 breyta \u00e1standi \u00edl\u00e1tsins. Venjulega \u00ed lokin af kort<\/b> s\u00edmt\u00f6l.<\/p>\n\n\n\n af<\/b> \u2013 skila n\u00faverandi gildi<\/p>\n\n\n\n Stundum, auk \u00feeirra a\u00f0ger\u00f0a sem kveikja \u00e1 n\u00fdju \u00e1standi gildisins, \u00fearftu vi\u00f0b\u00f3tar r\u00f6khugsun falna \u00ed \u00edl\u00e1tinu. H\u00e9r kemur monad s\u00e9r vel, \u00fear sem \u00fea\u00f0 er vi\u00f0b\u00f3t vi\u00f0 fall<\/b>. \u00dea\u00f0 getur til d\u00e6mis \u00e1kve\u00f0i\u00f0 hva\u00f0 eigi a\u00f0 gerast \u00feegar gildi\u00f0 er \u00e1kve\u00f0i\u00f0 e\u00f0a hva\u00f0a lei\u00f0 n\u00e6stu a\u00f0ger\u00f0ir skuli fara.<\/p>\n\n\n\n Monad leysir kannski vandam\u00e1li\u00f0 me\u00f0 gildi sem skila ekki s\u00f6nnu. \u00deegar \u00feetta gerist, n\u00e6stu kort<\/b> \u00c1k\u00f6ll eru hunsu\u00f0, en \u00fea\u00f0 gerir \u00fe\u00e9r kleift a\u00f0 skila vali me\u00f0 \u00fev\u00ed a\u00f0 hringja \u00ed f\u00e1 e\u00f0a<\/b> a\u00f0fer\u00f0. H\u00fan gerir \u00fe\u00e9r kleift a\u00f0 for\u00f0ast notkun if\/else-skilyr\u00f0a, sem eru vins\u00e6l \u00ed bo\u00f0h\u00e1ttur<\/b> forritun. \u00deessi monad samanstendur af \u00feremur \u00edl\u00e1tum:<\/p>\n\n\n\n Ekkert<\/b> \u2013 keyrir \u00feegar gildi sem er ekki satt lendir \u00ed \u00edl\u00e1tinu e\u00f0a s\u00edu<\/strong> A\u00f0fer\u00f0in skilar false. H\u00fan er notu\u00f0 til a\u00f0 herma eftir keyrslu falls. \u00deetta \u00fe\u00fd\u00f0ir a\u00f0 \u00feessi \u00edhlutur f\u00e6r falli\u00f0 en keyrir \u00fea\u00f0 ekki.<\/p>\n\n\n\n Bara<\/b> \u2013 \u00feetta er a\u00f0al\u00edl\u00e1ti\u00f0 sem sinnir \u00f6llum a\u00f0ger\u00f0um, en ef gildi\u00f0 breytist \u00ed falskt gildi e\u00f0a s\u00edu<\/b> a\u00f0fer\u00f0in skilar false, h\u00fan mun senda \u00fea\u00f0 til Ekkert<\/b> \u00edl\u00e1t.<\/p>\n\n\n\n\n
Funktor<\/h2>\n\n\n\n
Yfirl\u00fdsing<\/h3>\n\n\n\n
const Functor = value => ({\n map: fn => Functor(fn(value)),\n chain: fn => fn(value),\n of: () => value\n });<\/code>Hlj\u00f3\u00f0skrift<\/pre>\n\n\n\nHvortv\u00edsunard\u00e6mi<\/h3>\n\n\n\n
const randomInt = (max) => Math.floor(Math.random() * (max + 1))\n\nconst randomNumber = randomInt(200) \/\/ skilar t\u00f6lunni \u00e1 bilinu 0 til 200\n\ndecrease(randomNumber) \/\/ skilar (t\u00f6lu \u00e1 bilinu 0 til 200) - 1<\/code><\/pre>\n\n\n\nYfirl\u00fdsingard\u00e6mi<\/h3>\n\n\n\n
const randomIntWrapper = (max) =>\nFunctor(max)\n.map(increase) \/\/ max + 1\n.map(multiplyBy(Math.random())) \/\/ Math.random() * (max + 1)\n.map(Math.floor) \/\/ Math.floor(Math.random() * (max + 1))\n\nconst randomNumber = randomIntWrapper(200)\n\nrandomNumber.of() \/\/ skilar t\u00f6lunni \u00e1 milli 0 og 200\nrandomNumber.chain(decrease) \/\/ skilar (t\u00f6lu \u00e1 milli 0 og 200) - 1<\/code><\/pre>\n\n\n\nMonad\u00ed<\/h2>\n\n\n\n
Monad Kannski<\/h2>\n\n\n\n
![\"fallbili\u00f0fer\u00f0ir](\"\/app\/uploads\/2024\/05\/table.png\" "\\"bor\u00f0virkni")
<\/figure>\n\n\n\n![\"samstarfsf\u00e1ninn\"](\"\/app\/uploads\/2024\/05\/interested_in_cooperation_.png\")
<\/a><\/p>","protected":false},"excerpt":{"rendered":"