投稿時間:2022-11-14 04:19:49 RSSフィード2022-11-14 04:00 分まとめ(18件)

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海外TECH	DEV Community	Javascript: Check if an Array is a Subset of Another Array	https://dev.to/smpnjn/javascript-check-if-an-array-is-a-subset-of-another-array-950	Javascript Check if an Array is a Subset of Another ArrayThere are many use cases where knowing if an array is a subset of another can be quite useful and although usually immediately obvious to the human eye it can be difficult to evaluate in code In the code below arr is a subset of arr but arr is not let arr a b c let arr b c let arr c d If we want to find out if an array is a subset of another array the best way to evaluate this is by using the array every method This method iterates through each element in an array and performs a test on it If every element in the array passes that test then the overall every method will return true For each evaluation we have a parent array and a subset array where we want to check if the subset array is fully contained within the parent array To evaluate if one array is a subset of another we can run every on the each element on the subset array Within the every function we can test if the parent array contains each element in the subset array If it does then every will return true Otherwise it ll return false This can be accomplished easily with a function like the one shown below checkSubset will return true should the subsetArray be fully contained within the parentArray let arr a b c let arr b c let arr c d let checkSubset parentArray subsetArray gt return subsetArray every el gt return parentArray includes el checkSubset arr arr returns truecheckSubset arr arr returns false	2022-11-13 18:34:41
海外TECH	DEV Community	Javascript Array Every Method	https://dev.to/smpnjn/javascript-array-every-method-282b	Javascript Array Every MethodSometimes with arrays we want to test every element for a certain condition While individual conditions can be tested easily with an if statement it becomes a little trickier with multiple array elements As such Javascript provides a method on arrays called every which will test every element for a specific test If all pass the test the overall every method will pass true If one or more fail the test then the overall every method will return false Checking every element of an array for a testSuppose we have an array where we want to test if every number is above This is a perfect place to use every Let s take a look let arr let check arr every el index array gt return el gt console log check trueevery takes a function like in the form el index array gt el is the current element being iterated through by every index is the index of the current element being iterated through by the array array is the full array being iterated upon Here it would be Since arrow functions will return true if on one line without a return statement the above code can be simplified to this too let arr let check arr every el index array gt el gt console log check trueAs well the every method can take another form where it accepts a callback function s name along with a custom value for this That means you can create a function and then prep its content based on a custom this within the function itself For example below I pass value into this allowing us to change this value should we want to for other times when we call every let callbackFn function el if this value undefined return el gt this value return false let arr let check arr every callbackFn value Returns true Modifying an array with the every methodMuch like other array methods Javascript does allow modification of the array within a method called upon it For example we could modify each element of our array and then do a check upon it Since every is essentially a type of loop each element is looped over sequentially let arr let check arr every el index array gt arr index return el gt This is true since we subtracted from each element before the checkconsole log check trueWe can even delete elements from an array in the every loop let arr let check arr every el index array gt arr pop return el gt console log arr returns Javascript even lets you add elements to an array in every Since every fires only once for each element in an array it cannot lead to an infinite loop by simply pushing elements to the original array let arr let check arr every el index array gt arr push return el gt This is true since we subtracted from each element before the checkconsole log arr returns console log check returns true ConclusionThe every method is a built in way to do logical tests on entire arrays You should be careful with this on large arrays as it may lead to performance problems In most cases though it s a really useful tool to add to your array arsenal There are many other use cases where every is very useful For example you can also use every for other use cases like checking if an array is a subset of another array	2022-11-13 18:29:46
海外TECH	DEV Community	Difference between exports and module.exports	https://dev.to/dhanushnehru/difference-between-exports-and-moduleexports-nja	Difference between exports and module exportsThe module represents the current module in the plain Javascript object Exports is a plain JavaScript variable Module is a plain javascript object which has the exports propertyFrom one module to another when we want to export a single class variable or function we use modules exports From one module to another when we want to export multiple variables or functions we use exports var module exports value value var exports module exports return module exports In the above example we have assigned multiple values to the same object module exports value returns and module exports value returns var module exports var exports module exports return module exports In the preceding example exports is set to a value that results in modules Exports are no longer the same object module exports returns const userDetails data gt return getUsername gt data username getEmail gt data email module exports userDetails In the preceding example calling userDetails data gt returns the value of the username getUsername const getUsername data gt data usernameconst getEmail data gt data emailexports getUsername getUsername exports getEmail getEmail In the above example the value of username can be got by getUsername If we go with the first approach we do not need to include new lines in the export statement each time we create a new function Whereas in the second approach new functions if created gradually increases the number of lines of the exports statement as wellTherefore as a best practice in accordance with the NodeJs documentation s usage of exports and module exports we can avoid using exports and instead use module exports Thanks for reading ️ I hope you liked it Follow me via Twitter Instagram or Github	2022-11-13 18:11:25
ニュース	BBC News - Home	Donald Trump and Mitch McConnell: Republican anger over midterms	https://www.bbc.co.uk/news/world-us-canada-63618188?at_medium=RSS&at_campaign=KARANGA	mcconnell	2022-11-13 18:35:15
ニュース	BBC News - Home	Istanbul: Six dead, dozens wounded in Turkey explosion	https://www.bbc.co.uk/news/world-europe-63615076?at_medium=RSS&at_campaign=KARANGA	turkish	2022-11-13 18:12:31
ニュース	BBC News - Home	My Dad Wrote A Porno: Hit podcast series to come to an end in December	https://www.bbc.co.uk/news/entertainment-arts-63616438?at_medium=RSS&at_campaign=KARANGA	times	2022-11-13 18:06:38
ニュース	BBC News - Home	Fulham 1-2 Manchester United: Alejandro Garnacho scores dramatic injury-time winner	https://www.bbc.co.uk/sport/football/63531141?at_medium=RSS&at_campaign=KARANGA	Fulham Manchester United Alejandro Garnacho scores dramatic injury time winnerManchester United snatch a dramatic winner through Alejandro Garnacho as they beat Fulham in a thrilling final Premier League match before the World Cup	2022-11-13 18:37:06
ビジネス	ダイヤモンド・オンライン - 新着記事	できるリーダーは「話を聞ける」！部下の本音・行動を引き出す魔法の声かけ術 - 要約の達人　from flier	https://diamond.jp/articles/-/312791	できるリーダーは「話を聞ける」部下の本音・行動を引き出す魔法の声かけ術要約の達人fromflier最近、部下やチームのメンバーとどんなやりとりをしているだろうか。	2022-11-14 03:55:00
ビジネス	ダイヤモンド・オンライン - 新着記事	ポルシェ「マカンGTS」ドライバーの機微を完全把握したSUVのスポーツカー【試乗記】 - CAR and DRIVER 注目カー・ファイル	https://diamond.jp/articles/-/312789	ポルシェ「マカンGTS」ドライバーの機微を完全把握したSUVのスポーツカー【試乗記】CARandDRIVER注目カー・ファイルポルシェは、どれもがスポーティなキャラクターの持ち主。	2022-11-14 03:50:00
ビジネス	ダイヤモンド・オンライン - 新着記事	【お寺の掲示板109】仏さまの言葉はだいたい耳に痛い - 「お寺の掲示板」の深～いお言葉	https://diamond.jp/articles/-/312659	都合	2022-11-14 03:45:00
ビジネス	ダイヤモンド・オンライン - 新着記事	アマゾン利益率低下、投機的事業の余地なし - WSJ PickUp	https://diamond.jp/articles/-/312712	無理	2022-11-14 03:35:00
ビジネス	ダイヤモンド・オンライン - 新着記事	保険会社の実力が試される「ニューリスク」の保険商品開発の要諦 - ダイヤモンド保険ラボ	https://diamond.jp/articles/-/312820	保険会社	2022-11-14 03:30:00
ビジネス	ダイヤモンド・オンライン - 新着記事	米中間選挙、規制などテクノロジー政策への影響は - WSJ PickUp	https://diamond.jp/articles/-/312811	wsjpickup	2022-11-14 03:25:00
ビジネス	ダイヤモンド・オンライン - 新着記事	中国AMEC創業者、米中半導体戦争で板挟み - WSJ PickUp	https://diamond.jp/articles/-/312812	wsjpickup	2022-11-14 03:20:00
ビジネス	ダイヤモンド・オンライン - 新着記事	人生100年時代・あきらめるのはもったいない！ この冬「おとなの勉強」を始める人のための最初の5冊【書籍オンライン編集部セレクション】 - 独学大全	https://diamond.jp/articles/-/312416		2022-11-14 03:15:00
ビジネス	ダイヤモンド・オンライン - 新着記事	サイバーエージェントの営業の強さを支える目標設定と評価の仕組みを大公開 - NEW SALES	https://diamond.jp/articles/-/312639	newsales	2022-11-14 03:10:00
ビジネス	ダイヤモンド・オンライン - 新着記事	中学受験は激化の一途、“教育先延ばし”が子どもにとって致命的なワケ - ひとりっ子の学力の伸ばし方	https://diamond.jp/articles/-/312561	中学受験	2022-11-14 03:05:00
海外TECH	reddit	Ultimate Fighting Arena 2022 - Winners Semis - BMS | Bloom4Eva vs. 8LX | HIKARU	https://www.reddit.com/r/smashbros/comments/yu90vt/ultimate_fighting_arena_2022_winners_semis_bms/	Ultimate Fighting Arena Winners Semis BMS BloomEva vs LX HIKARUWatch Live Winners Semis Oliver quot BloomEva quot Alexander Twitter Wiki Team vs Eita quot HIKARU quot Hoshi Twitch Twitter Wiki Team Bayonetta BloomEva HIKARU Roy stock Bayonetta Small Battlefield DonkeyKong Bayonetta Pokémon Stadium DonkeyKong stock Bayonetta Pokémon Stadium DonkeyKong stocks stock Bayonetta Final Destination DonkeyKong Bayonetta Hollow Bastion DonkeyKong stock submitted by u Tery to r smashbros link comments	2022-11-13 18:02:16