投稿時間:2023-02-11 06:17:03 RSSフィード2023-02-11 06:00 分まとめ(20件)

カテゴリー等	サイト名等	記事タイトル・トレンドワード等	リンクURL	頻出ワード・要約等/検索ボリューム	登録日
IT	ITmedia 総合記事一覧	[ITmedia ビジネスオンライン] 「580円の朝焼肉」誰が食べている？　焼肉ライクが開店を“4時間”早めてまで始めたワケ	https://www.itmedia.co.jp/business/articles/2302/11/news038.html	itmedia	2023-02-11 05:30:00
AWS	AWS Partner Network (APN) Blog	Building a Solution for China Cross-Border VPC Connection	https://aws.amazon.com/blogs/apn/building-a-solution-for-china-cross-border-vpc-connection/	Building a Solution for China Cross Border VPC ConnectionMany customers want to connect commercial regions to the China regions but China s compliance and infrastructure requirements are different than other countries It requires isolation between VPCs in the China regions and VPCs in the other global regions Learn about a solution that enables cross border connectivity between six AWS commercial regions and China regions using a third party marketplace solution that relies on AWS Direct Connect partners	2023-02-10 20:02:30
AWS	AWS Database Blog	AWS DMS key troubleshooting metrics and performance enhancers	https://aws.amazon.com/blogs/database/aws-dms-key-troubleshooting-metrics-and-performance-enhancers/	AWS DMS key troubleshooting metrics and performance enhancersIn this post we discuss AWS Database Migration Service AWS DMS and how you can use Amazon CloudWatch and logs to monitor the performance and health of a replication task Additionally we discuss how to set up CloudWatch Alarms for an AWS DMS task as well as instance related metrics that we configure to receive …	2023-02-10 20:55:02
Ruby	Rubyタグが付けられた新着投稿 - Qiita	Rails apiモードでjsonではなく文字列を返す方法	https://qiita.com/kujira_engineer/items/e3198430cf223dca20c3	rails	2023-02-11 05:55:54
Ruby	Railsタグが付けられた新着投稿 - Qiita	Rails apiモードでjsonではなく文字列を返す方法	https://qiita.com/kujira_engineer/items/e3198430cf223dca20c3	rails	2023-02-11 05:55:54
海外TECH	DEV Community	Variable Declarations in JavaScript	https://dev.to/catherineisonline/variable-declarations-in-javascript-1915	Variable Declarations in JavaScriptA variable in JavaScript is a box that holds different data in it and this box has a name A variable can contain different data types The name is mandatory because it will help to find this box later on If there is no name it would be hard to find it because boxes can be very similar and you cannot just check everything it contains When you declare a variable besides the name you are using special keywords These keywords give special features to newly created variables which will late be used in specific situations These features give you more power to control the variables in different ways To declare a variable you simply write the special keywords variable name equal sign and the value if there is any The name is like a location indicator in the memory space which we can retrieve later Let s go through all variable keywords to understand why and how we use them JavaScript variable keywordsIn JavaScript we have variable keywords var let and const Var is the old and very first possible way of variable declaration in JavaScript Let is a new version and more modern way of var however has some differences which we will discuss very soon And finally the const keyword which is also just as new and modern as the let keyword Both let and const are most commonly used nowadays Sounds so easy right However there are a lot of differences between them Difference between JavaScript keywords️⃣DeclarationDeclaring a variable is the first thing that happens when we create a variable It s very similar to value assignment but it s not the same To declare a value means to create a reference to this value for later use assignment is when we give value But this can happen simultaneously So by using the JavaScript keyword and then the name you declare the value and with the equal symbol you give a value to it so you assign a value ー this is also called initialization When it comes to var you can actually redeclare a variable But when it comes to the let or const you cannot So you can give a var box some name and then use the same name and create again another box with the same name But of course both will not exist at the same time and the first one will be overwritten However let and const cannot be redeclared So if you give a name to a box using the let or const keyword and try to use the same name it won t be possible and JavaScript will throw a syntax error …has already been declared ️⃣ReassignmentAnother main difference between these three keywords is the possibility to reassign the value If you cannot redeclare a value it doesn t mean you can t change a value as it s a separate process If you are using var you can reassign the value of this variable anytime you want If you know exactly what you are doing and you know definitely that you will not make any changes to this variable you can use the var keyword even in the modern code but as a beginner it s better to stick to let and const The let keyword is the same as var and you can reassign the value Finally the const keyword which cannot be reassigned and once you assign the value to it cannot be changed When you are a beginner it s a great idea to always use const not to accidentally make mistakes and at the start you might see the assignment errors It helped me a lot to remember which keyword does what by using const because it is the most strict If you use only var as a beginner there is a very low chance to see any errors and that way you will not really understand why your code is not working ️⃣NamingWhen naming variables in JavaScript it s important to stick to some basic rules of naming conventions Besides naming conventions throughout your coding journey you will have to come up with the names There are different opinions among developers about what names are better The most important thing to remember is that you need to try to name the variable in a such way that it shortly explains what it holds and it can be clear for other developers or yourself when you come back to your old code Here are several naming conventions in JavaScript Variable names can start with a letter underscore or a dollar symbol Letter case matters helloThere and Hellothere can be different variables You can use numbers anywhere but not at the startNo spacesCannot use reserved words for example const is a reserved word so it does something and you cannot give Variable the same name When using boolean values it s better to start the variable s name with is or has hasBalance isClicked A variable cannot have a hyphen in the nameIf you want to know more about casing in JavaScript check out my post ️⃣ScopeIn JavaScript we have different scopes Scope refers to the availability of the variables and functions in specific parts of the code This makes variables separate from each other and keeps the code more controllable and organized This part of the code is called scope For example box in a box in a box in a box The very first box is the global scope the next box inside it is the function scope and another box inside the second box is the block scope Each variable keyword acts differently depending on the scope and it s vital to understand it Global scope is a top scope and where the scope starts It is the environment that is visible to all other parts of the code Function scope is the environment of the function So whichever variable is created inside the function and we say it s function scoped it means that it doesn t go outside the function scope Block scope is the third scope environment which also doesn t let created variables go outside its scope as long as this variable is block coped Block scope considered if conditions switch statements or loops like for and while Anything we declare in the global scope will be available everywhere across the code and in any other scope in this global scope Variables declared with the var keyword are considered global and by being global they are attached to the window object A window object is a global object of the browser environment On other other hand let and const are not attached to the window object They are still global and can be accessed anywhere in the code The reason is unknown as I tried to find the exact explanation why and in the end some people try to guess why and some simply agree that it was just designed this way At this point you don t have to worry about this Variables declared with var are also function scoped meaning that they will not be accessible outside the function scope Any variable declared inside a function is deleted and gone once the function ends Take a look at the next example which looks almost the same as the previous one However inside the function I created a new key variable called keyFour and also modified the keyOne When I console log the keys inside the function you will see that keyOne shows the latest value We already discussed it do you remember The var can be redeclared and we can also reassign a new value When I try to console log the updated value of keyOne however it shows the old value Why Because the new value is not accessible and it s function scoped Besides I created an additional new key with another var const and let variables and none of them are available outside this function So the let and const keywords are also function scoped A quick tip if you don t declare a variable with any variable keyword inside the function scope but assign a value this variable automatically becomes global However this doesn t work if you are using strict mode If you don t know what is strict mode just simply ignore this tip and never assign any values to variables without ever using any keyword And finally block scope is where the variable declared with the var keyword is not block scoped and is accessible outside the scope At the same time the let and const keywords are block scoped Let s do the exactly same thing we did in the function scope but move into the block scope Let s analyze what happens in the block scope First we changed the keyOne value which is also available outside this loop Compared to function scope we could not retrieve a new value but this time we can because var is not block scoped And we tried to retrieve a new var again which worked Secondly we tried to retrieve let and const from the block scope however it s not available Why Because let and const are both block scoped just like in the function scope There are a lot of things about the scope however for now will stop here as our main topic is variable declarations in general In conclusion variable declaration in JavaScript is crucial for managing data in the code Understanding the different variable keywords var let and const and their differences in declaration reassignment and scope is important for writing effective and efficient code It is also important to follow the naming conventions and practice naming variables in a way that is clear and concise making it easier to read and maintain the code By understanding variable declarations in JavaScript developers can make the most out of their code and write programs that are robust and scalable Enjoyed the post Please let me know in the comment down below	2023-02-10 20:14:43
海外TECH	Engadget	A Japanese conveyor-belt restaurant will use AI cameras to combat 'sushi terrorism'	https://www.engadget.com/japanese-conveyor-belt-restaurant-ai-cameras-sushi-terrorism-204820273.html?src=rss	A Japanese conveyor belt restaurant will use AI cameras to combat x sushi terrorism x A viral video trend in Japan has got sushi conveyor belt restaurants racing to prevent food tampering One chain Kura Sushi said it will use artificial intelligence to look for suspicious opening and closing of sushi plate covers Nikkei Asia reported this week Kura Sushi plans to start upgrading existing cameras which are used to track the dishes customers take from conveyor belts to determine their bill by early March If the system detects suspicious behavior it will alert employees We want to deploy our AI operated cameras to monitor if customers put the sushi they picked up with their hands back on the plates a spokesman told CNN “We are confident we will be able to upgrade the systems we already have in place to deal with these kind of behaviors Many folks in Japan have been outraged by a trend dubbed sushi terrorism Videos have shown people carrying out unhygienic acts such as licking the spoon for a container of green tea powder Other videos have shown patrons dumping wasabi onto sushi as it passes by on the conveyor belt Another video which apparently has more than million views on Twitter showed a person licking the top of a soy sauce bottle and the rim of a teacup before putting them back at a branch of the Sushiro chain They also licked a finger and touched a piece of passing sushi The clip and the response to it caused the stock of Sushiro s parent company to drop almost five percent Sushiro said it replaced all the soy sauce bottles and cleaned every cup at the affected restaurant Like other conveyor belt sushi chains it s enacted other policies like only making food to order to deter tampering and assure hygiene conscious customers that restaurants are clean Kura Sushi has used AI in other ways In it emerged that the company was using an app that can grade tuna At least at the time Kura Sushi was buying most of its tuna from outside of Japan The app was said to help it evaluate the quality of the cuts without having to travel in the midst of a pandemic	2023-02-10 20:48:20
海外TECH	WIRED	4 Best Online Flower Delivery Services (2023): Sustainable and Dried Flowers	https://www.wired.com/story/best-flower-delivery-services/	local	2023-02-10 20:08:39
ニュース	BBC News - Home	High-altitude object shot down over Alaska, US says	https://www.bbc.co.uk/news/world-us-canada-64605447?at_medium=RSS&at_campaign=KARANGA	balloon	2023-02-10 20:34:29
ニュース	BBC News - Home	Inside Aleppo: BBC sees devastation after quake	https://www.bbc.co.uk/news/world-middle-east-64597879?at_medium=RSS&at_campaign=KARANGA	syrian	2023-02-10 20:13:54
ニュース	BBC News - Home	Great Yarmouth: Huge blast after unplanned WW2 bomb detonation	https://www.bbc.co.uk/news/uk-england-norfolk-64604115?at_medium=RSS&at_campaign=KARANGA	detonationnorfolk	2023-02-10 20:31:31
ニュース	BBC News - Home	ICC Women's T20 World Cup 2023: Sri Lanka shock hosts South Africa in World Cup opener	https://www.bbc.co.uk/sport/cricket/64593957?at_medium=RSS&at_campaign=KARANGA	ICC Women x s T World Cup Sri Lanka shock hosts South Africa in World Cup openerSri Lanka s bowlers produce an inspired display to shock hosts South Africa in the opening fixture of the Women s T World Cup	2023-02-10 20:44:30
ビジネス	ダイヤモンド・オンライン - 新着記事	ビール・チューハイ主要30商品「値上げ率」ランキング！4位氷結、2位金麦、1位は？ - ビール完敗	https://diamond.jp/articles/-/317093	金麦	2023-02-11 05:25:00
ビジネス	ダイヤモンド・オンライン - 新着記事	北海道・福岡県の有料老人ホームランキング！高評価の施設ベスト118【2023年版】 - 最適な介護施設選び＆老人ホームランキング	https://diamond.jp/articles/-/316636	介護施設	2023-02-11 05:20:00
ビジネス	ダイヤモンド・オンライン - 新着記事	会話が途切れても怖くない！「たった3秒のガマン」で沈黙を味方にする話し方の裏ワザ - あなたの「話し方」が変わる！	https://diamond.jp/articles/-/317124	会話が途切れても怖くない「たった秒のガマン」で沈黙を味方にする話し方の裏ワザあなたの「話し方」が変わるビジネスの世界では「話し方」一つで大成功を手にすることもあれば、大損失を被ることもあります。	2023-02-11 05:15:00
ビジネス	ダイヤモンド・オンライン - 新着記事	国策半導体会社ラピダス首脳作成「トップ技術者100人リスト」の中身と業界の給与・転職事情 - 半導体 最後の賭け	https://diamond.jp/articles/-/317280	半導体の再興を目指す国策会社であるラピダスは、採用予定の日本のトップ技術者が並ぶ「人リスト」を作成し、エンジニアの再結集を目指しているが、可能なのか。	2023-02-11 05:10:00
ビジネス	ダイヤモンド・オンライン - 新着記事	Yakult1000だけじゃない！ヤクルトの売上4割超を稼ぐ海外事業「成功の秘密」 - 事例で身に付く 超・経営思考	https://diamond.jp/articles/-/316980	yakult	2023-02-11 05:05:00
ビジネス	東洋経済オンライン	平気で｢高級チョコ｣買う人が知らない残念な真実 意外な｢落とし穴｣があった！あなたは大丈夫？ | 食品の裏側＆世界一美味しい｢プロの手抜き和食｣安部ごはん | 東洋経済オンライン	https://toyokeizai.net/articles/-/651300?utm_source=rss&utm_medium=http&utm_campaign=link_back	東洋経済オンライン	2023-02-11 06:00:00
ビジネス	東洋経済オンライン	｢借金の多い企業ランキング｣トップ500社！ ネットキャッシュのマイナスが大きい上場企業 | 企業ランキング | 東洋経済オンライン	https://toyokeizai.net/articles/-/651952?utm_source=rss&utm_medium=http&utm_campaign=link_back	上場企業	2023-02-11 05:40:00
ビジネス	東洋経済オンライン	スシロー､社長の｢ツイッター降臨｣が意味する事 緊急事態こそ広報力･柔軟性が浮き彫りになる | 外食 | 東洋経済オンライン	https://toyokeizai.net/articles/-/651928?utm_source=rss&utm_medium=http&utm_campaign=link_back	回転寿司	2023-02-11 05:20:00