投稿時間:2023-04-13 16:09:16 RSSフィード2023-04-13 16:00 分まとめ(15件)

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IT	気になる、記になる…	｢Apple Glass｣は早ければ2026年〜2027年に量産開始か	https://taisy0.com/2023/04/13/170635.html	apple	2023-04-13 06:15:57
ROBOT	ロボスタ	【連載マンガ ロボクン vol.242】ロボットアイドル誕生！	https://robotstart.info/2023/04/13/robokun-242.html	firstappearedon	2023-04-13 06:00:19
IT	情報システムリーダーのためのIT情報専門サイト IT Leaders	ヴィーム、「Veeam Backup & Replication v12」をリリース、書き換え不能ストレージやオブジェクトストレージにバックアップ可能に | IT Leaders	https://it.impress.co.jp/articles/-/24722	ヴィーム、「VeeamBackupampReplicationv」をリリース、書き換え不能ストレージやオブジェクトストレージにバックアップ可能にITLeadersヴィーム・ソフトウェアは年月日、データバックアップソフトウェア新版「VeeamBackupampReplicationv」を発表した。	2023-04-13 15:23:00
技術ブログ	Developers.IO	PythonでWebAPIを作ろう! Fast APIでスピード開発体験を!	https://dev.classmethod.jp/articles/try_fastapi_intro/	fastapi	2023-04-13 06:37:16
技術ブログ	Developers.IO	[レポート] prismatixでのTerraform運用で活用しているツールの紹介 #devio_day1 #sub2	https://dev.classmethod.jp/articles/developersio-day-one-terraform-and-related-tools-utilized-by-prismatix/	develope	2023-04-13 06:09:18
海外TECH	DEV Community	Javascript Object #9	https://dev.to/samr/javascript-object-9-2cpp	Javascript Object We have seen so many important things about Javascript Object But now we are going to see another most important topic which is this in Javascript thisAs you may came across many programming languages and have a good familiarity about the this keyword But in Javascript this keyword in totally different Let s know about the Strange this keyword in Javasciript In Javascript this is the Object of which Function is property In more simple words this reference to the Object of that is currently calling the Function let s see this with an example let counter count next function return this count counter next as you can see here counter is an Object and next is a method inside the counter Object as you can see inside the Object The this keyword inside the method references the current Object counter But this is not enough we have to check the this keyword on differenct context like Global Context Function Context Global Context console log this window true In Global context this refers the Global Object in Browser it is the Window Object and in NodeJs Environment it is Global Object And this behaviour is same in both Strict and non strict mode And If you assign a property with this in Global context Javascript will add the Property to the window Object as like this this color Red console log window color Red Function Context In Javascript you can call the Function in Following ways Function Invocation Method Invocation Constructor Invocation indirect Invocation Function invocation Inside the Function the this keyword differs in Strict and Non Strict mode let s see function show console log this window true show When you call the show function the this references the global object which is the window on the web browser and global on Node js Calling the show function is the same as window show But in the Strict mode Javascript sets the this inside the Function context as undefined Let s see that with an example use strict function show console log this undefined show If you want to enable the Strict mode use the directive use strict in the beggining of the Javascript file or else you can use the Strict mode inside the specific function function show use strict console log this undefined true function display console log this undefined true display show Output truetrueAs you can see the strict mode applies for both the function and Nested function as well Method invocationWhen you call a method of an Object Javascript set the this to the Object that contains that method Let s see this with a quick example let car brand Honda getBrand function return this brand console log car getBrand Honda In this example the this object in the getBrand method references the car object Let s Go little tricky here as getBrand is a Property of a Object and it can be Stored in variable right Yes Let s do it let brand car getBrand console log brand undefined ufff Strange right for me too this things looks so strange untill i know the exact reason when you assign the brand variable with the Object getBrand property this will assign the Property but what happens is the brand variable is now in global context and it reference the Global Object thus inoder to fix this we have to bind the brand variable to the exact Object let brand car getBrand bind car console log brand Honda To fix this issue you use the bind method of the Function prototype object The bind method creates a new function whose the this keyword is set to a specified value Let s see another example let car brand Honda getBrand function return this brand let bike brand Harley Davidson let brand car getBrand bind bike console log brand Output Harley Davidson In this example the bind method sets the this to the bike object therefore you see the value of the brand property of the bike object on the console Constructor invocationWhen you use the new keyword to create an instance of a function object you use the function as a constructor function Car brand this brand brand Car prototype getBrand function return this brand let car new Car Honda console log car getBrand The expression new Car Honda is a constructor invocation of the Car function JavaScript creates a new object and sets this to the newly created object This pattern works great with only one potential problem Now you can invoke the Car as a function or as a constructor If you omit the new keyword as follows var bmw Car BMW console log bmw brand gt TypeError Cannot read property brand of undefined Since the this value in the Car sets to the global object the bmw brand returns undefined ES introduced a meta property named new target that allows you to detect whether a function is invoked as a simple invocation or as a constructor You can modify the Car function that uses the new target metaproperty as follows function Car brand if new target throw Error Must use the new operator to call the function this brand brand Indirect InvocationIn JavaScript functions are first class citizens In other words functions are objects which are instances of the Function type The Function type has two methods call and apply These methods allow you to set the this value when calling a function For example function getBrand prefix console log prefix this brand let honda brand Honda let audi brand Audi getBrand call honda It s a getBrand call audi It s an Code language PHP php In this example we called the getBrand function indirectly using the call method of the getBrand function We passed honda and audi object as the first argument of the call method therefore we got the corresponding brand in each call The apply method is similar to the call method except that its second argument is an array of arguments getBrand apply honda It s a It s a Honda getBrand apply audi It s an It s a Audi Thanks for You Mean Time Sam	2023-04-13 06:53:10
海外TECH	Engadget	Google Maps will help you navigate US national parks	https://www.engadget.com/google-maps-will-help-you-navigate-us-national-parks-061725188.html?src=rss	Google Maps will help you navigate US national parksGoogle is updating Maps with more detailed information about national parks in the US to make them easier to navigate and potentially prevent from getting lost When you search for a particular park on Android or iOS you ll now see photos and videos of its key attractions ーsay the Old Faithful or the Grand Prismatic Spring at Yellowstone ーtaken by others who d been there before nbsp Maps will now also highlight an entire trail from beginning to end when you search for it instead of just dropping a pin on its general location You ll even find details regarding its difficulty along with information on whether it s more suitable for walking running or cycling To make it even more informative Google will show other people s reviews of parks and trails along with other useful details such as where to find the nearest public bathroom nbsp Since national parks are huge and are often confusing Google will start highlighting park entrances later this month as well with Maps pointing you right to the trailhead Finally Google will make it possible to download offline maps for parks so that you don t have to worry about not being able to find your way if you suddenly lose access to the internet Downloadable maps will also available later this month nbsp These features will initially roll out for national parks in the US but Google plans to make Maps more useful to hikers around the world and will add more detailed information for national parks in other countries later this month If you want to virtually explore a park first though you can hit up Google Street View where you can find imagery for dozens of national parks This article originally appeared on Engadget at	2023-04-13 06:17:25
金融	RSS FILE - 日本証券業協会	株券等貸借取引状況（週間）	https://www.jsda.or.jp/shiryoshitsu/toukei/kabu-taiw/index.html	貸借	2023-04-13 06:30:00
海外ニュース	Japan Times latest articles	North Korean missile prompts Japan to issue brief evacuation warning	https://www.japantimes.co.jp/news/2023/04/13/asia-pacific/north-korea-missile-hokkaido-shelter/	North Korean missile prompts Japan to issue brief evacuation warningThe rare activation of the country s J Alert warning system had initially urged residents to take shelter either inside buildings or underground	2023-04-13 15:11:29
ニュース	BBC News - Home	UK economy saw no growth in February	https://www.bbc.co.uk/news/business-65250170?at_medium=RSS&at_campaign=KARANGA	construction	2023-04-13 06:45:28
ニュース	BBC News - Home	Ministers propose stricter rules for holiday lets	https://www.bbc.co.uk/news/uk-politics-65258629?at_medium=RSS&at_campaign=KARANGA	government	2023-04-13 06:29:58
ニュース	BBC News - Home	South Western Railway urges passengers to avoid London Waterloo	https://www.bbc.co.uk/news/uk-england-london-65260212?at_medium=RSS&at_campaign=KARANGA	london	2023-04-13 06:15:48
IT	週刊アスキー	GW期間限定！　やきとり家すみれ、キッズプレート2品が半額に　5月1日から	https://weekly.ascii.jp/elem/000/004/132/4132692/	期間限定	2023-04-13 15:20:00
マーケティング	AdverTimes	FCC賞2022、最高賞は佐賀県競馬組合「うまてなし。」に	https://www.advertimes.com/20230413/article416290/	佐賀県競馬組合	2023-04-13 06:57:30
マーケティング	AdverTimes	ヤマト運輸とエニグモ連携、越境EC匿名配送サービス「BUYMA YAMATO」を開始	https://www.advertimes.com/20230413/article416324/	buyma	2023-04-13 06:49:02