| js |
JavaScriptタグが付けられた新着投稿 - Qiita |
Ankiでフラッシュカードの両面間でデータを永続化させる |
https://qiita.com/yaju/items/1b3b6ce9f8a914f48de8
|
忘却曲線 |
2023-01-02 19:13:26 |
| AWS |
AWSタグが付けられた新着投稿 - Qiita |
TerraformでAWS環境をデプロイする前に下準備しておくべきこと（tfstate.tf / providor.tf / output.tf / ディレクトリ構造） |
https://qiita.com/hiyanger/items/9efdc570e6cfed5aab13
|
tatetfprovidortfoutputtf |
2023-01-02 19:02:52 |
| 海外TECH |
DEV Community |
C Vs C++ |
https://dev.to/jagroop2000/c-vs-c-42cn
|
C Vs C C and C are both programming languages but they were designed for different purposes and have some key differences Here are a few of the main differences between C and C C is an object oriented programming OOP language while C is a procedural language This means that C provides support for classes objects and other OOP concepts while C does not C includes features for exception handling such as try catch blocks which are not present in C C allows function overloading which means that multiple functions can have the same name as long as they have different argument lists C does not support function overloading C has a more flexible syntax than C with features such as default function arguments and inline functions C supports function templates which allow developers to write generic functions that can work with a variety of data types C does not have this feature C supports reference variables which are an alternative to pointers that allow developers to more easily manipulate memory addresses C does not have reference variables C has a more powerful type system than C with features such as class inheritance and virtual functions C includes support for the standard template library STL a collection of pre built data structures and algorithms that can be used in C programs C does not have this feature C supports namespaces which allow developers to group related code and avoid naming conflicts C does not have this feature C has improved support for object oriented programming with features such as polymorphism and inheritance C does not have these features C includes a number of additional operators and syntax elements that are not present in C such as the gt operator for accessing class members through pointers C allows developers to use inline functions which can improve the performance of their code by allowing the compiler to insert the code for the function directly at the point of the function call C does not have this feature Despite these differences C is based on C and many C programs can be easily adapted to C by adding object oriented features However the reverse is not true C code may not be compatible with C compilers and may require significant modification to work in a C environment |
2023-01-02 10:29:16 |
| 海外TECH |
DEV Community |
JS Functional Concepts: Pipe and Compose |
https://dev.to/joelbonetr/js-functional-concepts-pipe-and-compose-1mho
|
JS Functional Concepts Pipe and ComposeFunction piping and composition are concepts from functional programming that of course are possible in JavaScript as it s a multi paradigm programming language let s deep into this concepts quickly The concept is to execute more than a single function in a given order and pass the result of a function to the next one You can do it ugly like that function function function initialArg Or using function compositioncompose function function function initialArg or function pipingpipe function function function initialArg To make it short composition and piping are almost the same the only difference being the execution order If the functions are executed from left to right it s a pipe on the other hand if the functions are executed from right to left it s called compose A more accurate definition would be In Functional Programming Compose is the mechanism that composes the smaller units our functions into something more complex you guessed it another function Here s an example of a pipe function const pipe functions gt value gt return functions reduce currentValue currentFunction gt return currentFunction currentValue value Let s add some insights into this BasicsWe need to gather a N number of functionsAlso pick an argumentExecute them in chain passing the argument received to the first function that will be executedCall the next function adding as argument the result of the first function Continue doing the same for each function in the array destructuring to unpack our array of functions into functions const pipe functions gt value is the received argument value gt reduce helps by doing the iteration over all functions stacking the result return functions reduce currentValue currentFunction gt we return the current function sending the current value to it return currentFunction currentValue value We already know about arrow functions don t need brackets nor return tag if they are returning a single statement so we can spare on keyboard clicks by writing it like that const pipe functions gt input gt functions reduce chain func gt func chain input How to useconst pipe fns gt input gt fns reduce chain func gt func chain input const sum args gt args flat reduce x y gt x y const square val gt val val pipe sum square Remember that the first function is the one at the left Pipe so and squared is Our test went well everything seems to work fine but what about having to chain async functions Pipe on Async functionsOne use case I had on that is to have a middleware to handle requests between the client and a gateway the process was always the same do the request error handling pick the data inside the response process the response to cook some data and so on and so forth so having it looking like that was a charm export default async function handler req res switch req method case GET return pipeAsync provide parseData answer req headers Let s see how to handle async function piping in both Javascript and Typescript JS Versionexport const pipeAsync fns gt input gt fns reduce chain func gt chain then func Promise resolve input JSDoc Types added to make it more understandable I guess Applies Function piping to an array of async Functions param Promise lt Function gt fns returns Function export const pipeAsync fns gt type any input gt fns reduce type Promise lt Function gt chain type Function Promise lt Function gt any func gt chain then func Promise resolve input TS Versionexport const pipeAsync any fns Promise lt Function gt gt input any gt fns reduce chain Promise lt Function gt func Function Promise lt Function gt any gt chain then func Promise resolve input This way it will work both for async and non async functions so it s a winner over the example above You may be wondering what about function composition so let s take a gander Function CompositionIf you prefer to call the functions from right to left instead you just need to change reduce for redureRight and you re good to go Let s see the async way with function composition export const composeAsync fns gt input gt fns reduceRight chain func gt chain then func Promise resolve input Back to the example above let s replicate the same but with composition How to useconst compose fns gt input gt fns reduceRight chain func gt func chain input const sum args gt args flat reduce x y gt x y const square val gt val val pipe square sum Note that we reversed the function order to keep it consistent with the example at the top of the post Now sum which is at the rightmost position will be called first hence and then squared is If you have any question or suggestion please comment down below |
2023-01-02 10:23:34 |
| ニュース |
BBC News - Home |
Ice and travel alerts for Scotland and north England |
https://www.bbc.co.uk/news/uk-scotland-64139015?at_medium=RSS&at_campaign=KARANGA
|
ireland |
2023-01-02 10:14:53 |
| ニュース |
BBC News - Home |
Adelaide International: Novak Djokovic receives positive welcome back to Australia |
https://www.bbc.co.uk/sport/tennis/64143350?at_medium=RSS&at_campaign=KARANGA
|
Adelaide International Novak Djokovic receives positive welcome back to AustraliaNovak Djokovic receives a positive welcome back to Australia as he made a rare doubles appearances at the Adelaide International |
2023-01-02 10:05:21 |
| 北海道 |
北海道新聞 |
シリア空港攻撃２人死亡 イスラエルか |
https://www.hokkaido-np.co.jp/article/783048/
|
国際空港 |
2023-01-02 19:38:00 |
| 北海道 |
北海道新聞 |
年越し攻撃、首都キーウ緊急停電 死傷者、インフラ損傷 |
https://www.hokkaido-np.co.jp/article/783047/
|
首都 |
2023-01-02 19:37:00 |
| 北海道 |
北海道新聞 |
二階氏「ウサギのように俊敏に」 卯年生まれ国会議員は５５人 |
https://www.hokkaido-np.co.jp/article/783012/
|
国会議員 |
2023-01-02 19:36:06 |
| 北海道 |
北海道新聞 |
地場産紅あずま 独自メニューでＰＲ 由仁７日からフェス |
https://www.hokkaido-np.co.jp/article/783038/
|
紅あずま |
2023-01-02 19:19:03 |
| 北海道 |
北海道新聞 |
知の力、次代担う人づくり 道北５大学トップに聞く |
https://www.hokkaido-np.co.jp/article/783045/
|
人口流出 |
2023-01-02 19:30:00 |
| 北海道 |
北海道新聞 |
日体大柏、青森山田が８強 高校サッカー、前橋育英も |
https://www.hokkaido-np.co.jp/article/783010/
|
前橋育英 |
2023-01-02 19:28:29 |
| 北海道 |
北海道新聞 |
ＰＫ戦で青森山田ＧＫ鈴木が活躍 高校サッカー、ベスト８入り |
https://www.hokkaido-np.co.jp/article/783043/
|
青森山田 |
2023-01-02 19:27:00 |
| 北海道 |
北海道新聞 |
餅詰まらせ男性４人重体 ６０～８０代、東京 |
https://www.hokkaido-np.co.jp/article/783022/
|
東京消防庁 |
2023-01-02 19:24:06 |
| 北海道 |
北海道新聞 |
山形・鶴岡の土砂崩れ、２人死亡 行方不明の高齢夫婦か |
https://www.hokkaido-np.co.jp/article/783028/
|
土砂崩れ |
2023-01-02 19:22:06 |
| 北海道 |
北海道新聞 |
城西大に山上りの新星 箱根駅伝 |
https://www.hokkaido-np.co.jp/article/783042/
|
箱根駅伝 |
2023-01-02 19:17:00 |
| 北海道 |
北海道新聞 |
国内７万５８０１人感染 新型コロナ、２４４人死亡 |
https://www.hokkaido-np.co.jp/article/783041/
|
新型コロナウイルス |
2023-01-02 19:17:00 |
| 北海道 |
北海道新聞 |
ドサンコまたがり社殿へ 函館八幡宮で騎馬参拝 |
https://www.hokkaido-np.co.jp/article/783040/
|
函館八幡宮 |
2023-01-02 19:14:00 |
| 北海道 |
北海道新聞 |
行動制限なし初売り盛況 空知 大雪で客足鈍る店も |
https://www.hokkaido-np.co.jp/article/783030/
|
空知管内 |
2023-01-02 19:11:00 |
| 北海道 |
北海道新聞 |
正恩氏のプレゼントはセイコー？ 「朝鮮少年団」の子どもたちに |
https://www.hokkaido-np.co.jp/article/783037/
|
北朝鮮メディア |
2023-01-02 19:09:00 |
| 北海道 |
北海道新聞 |
藤丸閉店まで１カ月 最後の初売りに行列 売り尽くしセールも |
https://www.hokkaido-np.co.jp/article/783009/
|
閉店 |
2023-01-02 19:02:39 |
| 北海道 |
北海道新聞 |
宮崎県知事、コロナ感染 ６日まで公舎療養 |
https://www.hokkaido-np.co.jp/article/783035/
|
宮崎県知事 |
2023-01-02 19:02:00 |
| 北海道 |
北海道新聞 |
ＯＢ鎌田の前で８強入り 京都・東山、高校サッカー |
https://www.hokkaido-np.co.jp/article/783034/
|
日本代表 |
2023-01-02 19:01:00 |
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