投稿時間:2023-07-15 01:13:18 RSSフィード2023-07-15 01:00 分まとめ(19件)

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Docker	dockerタグが付けられた新着投稿 - Qiita	Dockerをinstallして使いこなすまでの備忘録(記事は途中です)	https://qiita.com/keisuke-eng/items/cb29553bc1189695e81c	docker	2023-07-15 00:35:31
海外TECH	MakeUseOf	How to Use IRQ and I/O Addresses to Resolve Conflicts on Windows 10	https://www.makeuseof.com/irq-io-addresses-resolve-conflicts-windows-10/	windows	2023-07-14 15:15:18
海外TECH	DEV Community	Tail call optimization in ES6(javascript) in easy language	https://dev.to/diwakarkashyap/tail-call-optimization-in-es6javascript-in-easy-language-11e6	Tail call optimization in ES javascript in easy languageTail call optimization TCO is a technique used to optimize recursive functions by avoiding the accumulation of stack frames In ECMAScript ES TCO is not required but some JavaScript engines might provide limited support for it Let s understand TCO with an easy example in plain language Consider a function to calculate the factorial of a number function factorial n if n return else return n factorial n In this code the factorial function recursively calls itself multiplying the current number n with the factorial of n However this implementation does not utilize TCO To enable TCO we can modify the function to use an accumulator parameter function factorial n accumulator if n return accumulator else return factorial n n accumulator Here we introduce an extra parameter called accumulator which keeps track of the intermediate result In each recursive call instead of directly returning n factorial n we update the accumulator by multiplying it with n and pass it to the next recursive call With this modification the recursive call is now a tail call because it s the last operation before returning and it doesn t require any further computation It allows the JavaScript engine to optimize the call by reusing the current stack frame preventing potential stack overflow errors for large input values of n However it s important to note that ECMAScript doesn t mandate TCO and its availability depends on the JavaScript engine Different engines may handle tail calls differently so the optimization is not guaranteed to work consistently across all environments To ensure broader compatibility and reliable optimization you may consider using iterative approaches or libraries that provide TCO features such as Babel s babel plugin tailcall optimization or languages like ClojureScript that compile to JavaScript with built in TCO support Thank you for reading this blog follow me on Twitter I regularly share blogs and post on Javascript React Web development and opensource contributionTwitter Github	2023-07-14 15:24:18
海外TECH	DEV Community	Exploring the Advantages of PostgreSQL (part-1)	https://dev.to/hassanrehan/exploring-the-advantages-of-postgresql-bkf	Exploring the Advantages of PostgreSQL part When it comes to selecting a reliable and efficient database management system PostgreSQL is a top contender It offers a wide range of features and a flexible architecture making it a popular choice among developers and organizations In this blog post we will dive into the key features of PostgreSQL and highlight why it is regarded as a powerful database solution Reliability ACID ComplianceOne of the standout features of PostgreSQL is its adherence to ACID compliance ACID stands for Atomicity Consistency Isolation and Durability PostgreSQL ensures that all transactions are treated as indivisible units guaranteeing the integrity of your data Whether it s a single operation or a series of database actions PostgreSQL maintains the consistency and durability of your data throughout the transaction process Flexibility Object Relational CapabilitiesPostgreSQL is recognized as an object relational database combining the strengths of the traditional relational model with support for object oriented data This versatility allows developers to store and manipulate complex data structures while benefiting from the reliability of a relational database management system With PostgreSQL you can seamlessly handle both structured and unstructured data making it suitable for modern applications with diverse data requirements Extensibility Tailor to Your NeedsPostgreSQL stands out for its exceptional extensibility providing developers with the freedom to define their own data types functions and operators This level of customization empowers you to adapt PostgreSQL to meet the unique requirements of your application Whether you need to create custom data types or define specific behaviors for operators PostgreSQL offers the flexibility to extend its capabilities and align them with your desired functionality High Availability Replication SupportEnsuring high availability and data redundancy is crucial for any production system PostgreSQL offers built in support for replication allowing you to create multiple copies of your database By distributing the database across multiple servers you can achieve high availability and protect against data loss PostgreSQL provides various replication configurations including master slave and master master setups offering flexibility to suit your specific needs Efficient Spatial Data Handling Geospatial SupportPostgreSQL excels at handling geospatial data making it an excellent choice for applications that deal with maps location based services or spatial analysis It offers built in support for geospatial data and provides a wide range of functions and operators specifically designed to efficiently manipulate and analyze spatial data Whether you need to calculate distances find intersections or perform complex spatial queries PostgreSQL equips you with the necessary tools for these tasks Understanding the ArchitectureTo better understand how PostgreSQL works let s break down its architecture into three main components Server Process The server process is at the core of PostgreSQL s architecture It manages the database handles query execution and ensures concurrent access to the data The server process initializes the database loads data and starts the backend processes It plays a vital role in maintaining transaction integrity and ensuring overall stability and reliability Backend Processes Backend processes are responsible for processing queries and delivering results to client processes Each backend process is associated with a single database connection and executes queries submitted over that connection These processes work efficiently to optimize performance and resource utilization Client Processes Client processes act as intermediaries between users and the server process They submit queries to the server process and receive results in return Client processes also handle user authentication and authorization ensuring secure access to the database By managing communication between users and the server process client processes provide a smooth and secure user experience Efficient Query ProcessingQuery processing in PostgreSQL involves several steps Parsing The query is parsed breaking it down into tokens PostgreSQL s parser generates an abstract syntax tree AST representation of the query enabling further analysis and execution Analysis Once parsed the analyzer determines the data types involved in the query and estimates the cost of execution This information is crucial for subsequent optimization steps Execution The query is executed using the AST representation generated during parsing The executor ensures accurate and efficient results are returned Optimizing PerformancePostgreSQL employs a cost estimation mechanism to optimize query performance By estimating the cost of executing a query PostgreSQL s optimizer selects the most efficient execution plan Factors such as table sizes the number of rows returned and query complexity are taken into account enhancing overall performance In ConclusionPostgreSQL is a reliable and flexible database management system that offers a wide range of features Its ACID compliance object relational capabilities extensibility replication support geospatial features efficient query processing and seamless integration make it a preferred choice for various applications Whether you re developing web applications enterprise systems or data warehousing solutions PostgreSQL provides the flexibility and reliability you need Incorporate PostgreSQL into your next project and experience its potential firsthand ReferencesChatGPT for streamlining the text and grammar correction	2023-07-14 15:08:37
Apple	AppleInsider - Frontpage News	Apple will use 3D printing to make Apple Watch Ultra mechanical parts	https://appleinsider.com/articles/23/07/14/apple-will-use-3d-printing-to-make-apple-watch-ultra-mechanical-parts?utm_medium=rss	Apple will use D printing to make Apple Watch Ultra mechanical partsThe next edition of the Apple Watch Ultra will feature titanium mechanical parts where some have been produced by D printing to save time and cost says analyst Ming Chi Kuo The first generation Apple Watch UltraApple is not likely to be turning to consumer D printers for the new Apple Watch Ultra but reportedly it will be moving away from its regular CNC machining process at least in part Computerized Numerical Control CNC is the process of taking CAD designs and automatically manufacturing the parts by cutting at the material Read more	2023-07-14 15:12:17
金融	金融庁ホームページ	審判期日の予定を更新しました。	https://www.fsa.go.jp/policy/kachoukin/06.html	期日	2023-07-14 16:00:00
金融	金融庁ホームページ	北陸財務局が「令和５年７月７日からの大雨にかかる災害等に対する金融上の措置について」を要請しました。	https://www.fsa.go.jp/news/r5/ginkou/20230710.html	北陸財務局	2023-07-14 15:18:00
ニュース	BBC News - Home	Footballer Mendy found not guilty of raping woman	https://www.bbc.co.uk/news/uk-england-manchester-66201526?at_medium=RSS&at_campaign=KARANGA	cheshire	2023-07-14 15:29:32
ニュース	BBC News - Home	What is that? Rare animal sighting delights onlookers	https://www.bbc.co.uk/news/world-asia-66200508?at_medium=RSS&at_campaign=KARANGA	small	2023-07-14 15:23:58
ニュース	BBC News - Home	NHS criticised over deaths of mothers from herpes	https://www.bbc.co.uk/news/uk-england-kent-66203176?at_medium=RSS&at_campaign=KARANGA	hospitals	2023-07-14 15:28:09
ニュース	BBC News - Home	Parents left feeling 'rejected' over lack of SEND holiday care for children	https://www.bbc.co.uk/news/education-66188156?at_medium=RSS&at_campaign=KARANGA	holidays	2023-07-14 15:42:19
ニュース	BBC News - Home	BP found guilty after worker died in offshore fall in 2014	https://www.bbc.co.uk/news/uk-scotland-north-east-orkney-shetland-66190373?at_medium=RSS&at_campaign=KARANGA	energy	2023-07-14 15:35:22
ニュース	BBC News - Home	Russian parliament bans gender reassignment surgery for trans people	https://www.bbc.co.uk/news/world-europe-66200194?at_medium=RSS&at_campaign=KARANGA	gender	2023-07-14 15:21:41
ニュース	BBC News - Home	NHS: Woman's dentist appointment means 200-mile round trip	https://www.bbc.co.uk/news/uk-wales-66198808?at_medium=RSS&at_campaign=KARANGA	round	2023-07-14 15:20:53
ニュース	BBC News - Home	Hollywood grinds to a halt - so what happens now?	https://www.bbc.co.uk/news/entertainment-arts-66196019?at_medium=RSS&at_campaign=KARANGA	productions	2023-07-14 15:01:38
ニュース	BBC News - Home	Transgender women barred from female events as UCI takes 'precautionary measure'	https://www.bbc.co.uk/sport/cycling/66203709?at_medium=RSS&at_campaign=KARANGA	women	2023-07-14 15:18:47
ニュース	BBC News - Home	Jurrien Timber: Arsenal sign Ajax & Netherlands defender for £34m	https://www.bbc.co.uk/sport/football/66017042?at_medium=RSS&at_campaign=KARANGA	initial	2023-07-14 15:15:05
ニュース	BBC News - Home	Wimbledon 2023 results: Novak Djokovic beats Jannik Sinner in semi-finals	https://www.bbc.co.uk/sport/tennis/66194375?at_medium=RSS&at_campaign=KARANGA	jannik	2023-07-14 15:35:14
ニュース	BBC News - Home	Tour de France 2023: Michal Kwiatkowski wins stage 13 as Pogacar cuts Vingegaard's lead	https://www.bbc.co.uk/sport/cycling/66205097?at_medium=RSS&at_campaign=KARANGA	Tour de France Michal Kwiatkowski wins stage as Pogacar cuts Vingegaard x s leadMichal Kwiatkowski gives British team Ineos Grenadiers their first stage victory of this year s Tour de France as he wins the summit finish on stage	2023-07-14 15:46:26