投稿時間:2022-08-28 18:11:24 RSSフィード2022-08-28 18:00 分まとめ(15件)

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IT	気になる、記になる…	｢Surface Pro X｣は｢Surface Pro｣のメインラインに統合へ − ｢Surface Pro 9｣はIntelベースとARMベースから選択可能に	https://taisy0.com/2022/08/28/160639.html	intel	2022-08-28 08:51:55
python	Pythonタグが付けられた新着投稿 - Qiita	ヘッドレスブラウザSplashをHerokuにDockerデプロイする	https://qiita.com/itoi10/items/369430b91991fe3afa8e	docker	2022-08-28 17:54:11
python	Pythonタグが付けられた新着投稿 - Qiita	Python 基礎的な組み込み関数	https://qiita.com/y-matsunaga/items/daab7dfb4c92b6db1b45	rangepyt	2022-08-28 17:51:54
Ruby	Rubyタグが付けられた新着投稿 - Qiita	RubyからJavaに移行する時の考え方	https://qiita.com/yuki8634/items/340e6f1eb8864190df87	違い	2022-08-28 17:53:11
Docker	dockerタグが付けられた新着投稿 - Qiita	ヘッドレスブラウザSplashをHerokuにDockerデプロイする	https://qiita.com/itoi10/items/369430b91991fe3afa8e	docker	2022-08-28 17:54:11
Ruby	Railsタグが付けられた新着投稿 - Qiita	RubyからJavaに移行する時の考え方	https://qiita.com/yuki8634/items/340e6f1eb8864190df87	違い	2022-08-28 17:53:11
海外TECH	DEV Community	Variadic Currying in JavaScript	https://dev.to/refine/variadic-currying-in-javascript-nj9	Variadic Currying in JavaScript IntroductionIn this post we first look at the confusion around currying in JavaScript especially with respect to polyadic partial application We find out that we re not really doing currying in the real sense that it is implemented in Haskell rather in a much limited capacity In the later part we delve into variadic currying in a stricter sense with an example that returns unary accumulators Steps we ll cover Variadic Partial ApplicationUsing Function prototype MethodsVariadic Currying with TerminationThis post is about variadic currying in JavaScript It is the fifth part of the series titled Curry Functions in JavaScript Variadic Partial ApplicationIn the previous article titled Auto currying in JavaScript we focused on the unarity of curried functions because that s what a curried function ought to be We defined two versions of the curry function The first one maintains unarity of the accumulator function at every level of the recursive stack In the second definition of curry though with the spread args arguments we are introducing polyadic partial application to the first call of the curried function function curry f return function curried args if args length gt f length return f args return accumulator function accumulator a return curried args a This is a good starting point to deviate from actual currying So now we can take an arbitrary number of arguments for our first call to the curried function function createMessage greeting name message return greeting name message const curriedCreateMessage curry createMessage First accumulator is a variadic functionconsole log curriedCreateMessage Hi Haskell Whadup Hi Haskell Whadup console log curriedCreateMessage Hi Haskell Whadup Hi Haskell Whadup console log curriedCreateMessage Hi Haskell Whadup Say something Let s talk Hi Haskell Whadup Subsequent accumulators are unaryconsole log curriedCreateMessage Hi Haskell Whadup Say something Let s talk Function accumulator console log curriedCreateMessage Hi Haskell Whadup Say something Let s talk Hi Haskell Whadup Notice we have opened only the first accumulator to accept any number of arguments Subsequent calls maintain unarity of the accumulator with accumulator a accepting only one argument We can deviate more and allow the accumulator to be polyadic with a function curry f return function curried args if args length gt f length return f args return accumulator function accumulator a return curried args a Doing so allows accumulator a to be variadic at every level of the recursive stack So now we can take multiple arguments in the subsequent calls as well console log curriedCreateMessage Hi Haskell Whadup Say something Let s talk Hi Haskell Whadup console log curriedCreateMessage Hi Haskell Whadup Say something Let s talk Hi Haskell Whadup Notice the additional arguments are gracefully ignored by JavaScript So basically what we ve done is allow the accumulator to take multiple arguments per call It can be unary as well as polyadic We ve lost the essence of currying But now our curry function is much more powerful We can pass any number of arguments to an accumulator as long as that is returned And it is common to implement this with native JavaScript Function prototype methods Using Function prototype MethodsWe can re write the curry function with Function prototype apply and with Function prototype bind with Function protoype applyfunction curry f return function curried args if args length gt f length return f args return accumulator function accumulator a return curried apply this args a with Function prototype bindfunction curryBound f return function curried args if args length lt f length return curried bind null args return f args Refactoring curry with Function prototype apply is not radically different in terms of the logic We re just passing in the arguments args and a as part of an array instead of a list However with Function prototype bind we are returning a bound function that binds incoming arguments recursively to a copy of itself till we are able to receive all required arguments So inside curryBound the curried function at a current execution context is a bound copy of the curried function called one level below it in the recursive stack with the arguments passed there To be semantically more accurate we should rename curryBound to be partialize and curried to be bound function partialize f return function bound args if args length lt f length return bound bind null args return f args This is because Function prototype bind applied here allows a variadic and more powerful partial application than unary currying Really this is nothing more than native JavaScript partial application with context binding and recursion The StunnerOk so what about invoking our original function f when we have all arguments available f args We re just calling a polyadic function with all its required arguments Is it currying To me with f args we just embraced back what we wanted to avoid by accepting single arguments at a time That is we have not found a way around to call our original function f with single arguments sequentially In Haskell currying does not involve calling the multary function with all arguments passed in collectively In JavaScript we are eventually calling it with all arguments together and with the possibility of accepting additional ones We re fooling around What we re actually doing is generating a series of variadic accumulators returned in sequence with good intentions inspired by currying to begin with This is probably what currying should idiomatically mean in the sphere of JavaScript Variadic Currying with TerminationIn a stricter sense if we want to implement currying in JavaScript at best we can go as far as returning unary accumulators Contrary to this as we have seen above variadic multary accumulators are also commonly returned However we can go ahead and implement variadic currying by returning unary accumulators as well This can be a case if our f is variadic itself Below we have modified our createMessage function to produce a message for a given arbitrary number of text strings function createMessage texts return texts reduce combinedText currentText gt combinedText currentText TerminatorHere we want to curry createMessage with unary accumulators And we can keep receiving as many arguments we want without stopping So in order to produce a result from a curried variadic function we have to decide on an arity for f at some point After we fix an arity of our desire for f by passing in those arguments one at a time we can terminate the accumulator The idea is to terminate the accumulator when we receive an empty undefined argument and invoke f with the available arguments So the empty parens acts as the terminator in this case For a curried function vCurriedCreateMessage returned from vCurry by passing in createMessage let s say we want to terminate the accumulator after arguments And we want to invoke f after that It will look something like this const vCurriedCreateMessage vCurry createMessage const messageHaskell vCurriedCreateMessage Hi Haskell I hope you re doing good We re discussing currying here Do you wanna join in See you soon Bye messageHaskell The PlanImplementing vCurry follows a slightly different logic mostly due to the fact that we have to terminate the accumulator on demand with an empty argument i e having a value of undefined And since sometimes a variadic function can potentially take infinite number of arguments it can lead to infinite currying We ll talk about infinite currying in an upcoming article but for such cases f length doesn t play an important role in the currying logic Instead length of the incoming arguments is the main point of focus If we have an incoming argument we keep accumulating When we receive none we terminate and invoke f with accumulated arguments function vCurry f function curried args return function accumulator a if args length a return curried args a return f args return curried So now currying createMessage and invoking the curried function with arguments and then invoking returned function with empty argument will produce the message string const vCurriedCreateMessage vCurry createMessage const messageHaskellShorter vCurriedCreateMessage Hi Haskell n You can t see this I hope you re doing good n We re discussing currying here Do you wanna join in Bye const messageHaskell vCurriedCreateMessage Hi Haskell n I hope you re doing good n We re discussing currying here Do you wanna join in n See you soon n Bye const messageHaskellLonger messageHaskell nAbdullah Numan console log messageHaskellShorter Additional arguments ignored You can t see this Hi Haskell I hope you re doing good We re discussing currying here Do you wanna join in console log messageHaskell Additional arguments ignored Bye Hi Haskell I hope you re doing good We re discussing currying here Do you wanna join in See you soon Bye console log messageHaskellLonger Extended from messageHaskell Hi Haskell I hope you re doing good We re discussing currying here Do you wanna join in See you soon Bye Abdullah Numan Notice the messageHaskellLonger function The curried function can be extended basing on that of a smaller arity to any arbitrary arity before it gets terminated Notice also that since we focused on unary implementation of variadic currying the accumulators ignore the second arguments passed Currying a variadic function is quite different from currying functions with fixed arity in terms of the logic especially with respect to how termination is achieved by passing an empty argument Without termination it can take infinite number of arguments In the next article we ll see an example of infinitely curried function that does not require termination at all ConclusionIn this post we found out that deviating from unary currying in leads to variadic partial application in JavaScript which turns out to be more powerful We also saw how currying an existing variadic function follows a different logic than those with fixed arity with a unary implementation Writer Abdullah Numan Build your React based CRUD applications without constraintsBuilding CRUD applications involves many repetitive task consuming your precious development time If you are starting from scratch you also have to implement custom solutions for critical parts of your application like authentication authorization state management and networking Check out refine if you are interested in a headless framework with robust architecture and full of industry best practices for your next CRUD project refine is a open source React based framework for building CRUD applications without constraints It can speed up your development time up to X without compromising freedom on styling customization and project workflow refine is headless by design and it connects backend services out of the box including custom REST and GraphQL API s Visit refine GitHub repository for more information demos tutorials and example projects	2022-08-28 08:30:17
海外TECH	DEV Community	[#1]create a graph(based on adjacent matrix) and implement an DFS iterator	https://dev.to/starevan/1create-a-graphbased-on-adjacent-matrix-and-implement-an-dfs-iterator-40im		2022-08-28 08:13:01
海外ニュース	Japan Times latest articles	New Nippon Ishin leader promises to continue co-founder’s policies	https://www.japantimes.co.jp/news/2022/08/28/national/politics-diplomacy/new-nippon-ishin-leader-co-founder-policy/	New Nippon Ishin leader promises to continue co founder s policiesDespite recent electoral gains the second largest opposition group in parliament must learn to appeal to voters outside Kansai and further distinguish itself from the	2022-08-28 17:35:55
ニュース	BBC News - Home	Energy bills: Next PM will tackle eye-watering costs, says Johnson amid criticism	https://www.bbc.co.uk/news/uk-politics-62703858?at_medium=RSS&at_campaign=KARANGA	package	2022-08-28 08:53:05
北海道	北海道新聞	「差別が子供の日常奪う」　広島、朝鮮学校現状学ぶ	https://www.hokkaido-np.co.jp/article/722984/	市民団体	2022-08-28 17:22:00
北海道	北海道新聞	英党首選、トラス外相優勢　「ジョンソン派」が後押し	https://www.hokkaido-np.co.jp/article/722983/	首相	2022-08-28 17:22:00
北海道	北海道新聞	台風１１号発生、西日本接近か　進路予測に注意を	https://www.hokkaido-np.co.jp/article/722982/	同日午後	2022-08-28 17:17:00
北海道	北海道新聞	オ４―１０西（２８日）　西武が１６安打１０得点	https://www.hokkaido-np.co.jp/article/722979/	長短打	2022-08-28 17:10:00
北海道	北海道新聞	自民参院、３派で要職配分　政審会長は岸田派松山氏へ	https://www.hokkaido-np.co.jp/article/722978/	松山政司	2022-08-28 17:08:00