投稿時間:2023-08-19 23:13:33 RSSフィード2023-08-19 23:00 分まとめ(14件)

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python	Pythonタグが付けられた新着投稿 - Qiita	ABC315 A~E 解説 (Python)	https://qiita.com/hiroyuk1/items/1a97d733e492c8069c36	nputforiinaiueossreplacei	2023-08-19 22:59:02
python	Pythonタグが付けられた新着投稿 - Qiita	Pythonにおいて直列化について学ぶ	https://qiita.com/ItachInotanukI/items/3faec18ea7f3bc628d4c	chatgpt	2023-08-19 22:24:56
python	Pythonタグが付けられた新着投稿 - Qiita	【統計の基礎】ナゼ、正規分布の数式は複雑か？	https://qiita.com/ka201504/items/c3d7a8f5e6c509b53b26	左右対称	2023-08-19 22:04:47
AWS	AWSタグが付けられた新着投稿 - Qiita	AWS Well-Architected Labs Operational Excellence 100 Dependency Monitoringメモ	https://qiita.com/kenryo/items/11ac23a9af41353f5381	excel	2023-08-19 22:40:38
海外TECH	MakeUseOf	What Makes the Tesla Model 3 Performance Variant So Special?	https://www.makeuseof.com/tesla-model-3-performance-variant/	performance	2023-08-19 13:16:27
海外TECH	DEV Community	Top 10 Web3 Interview Questions And Answers #Part1	https://dev.to/drsavvina/top-10-web3-interview-questions-and-answers-part1-55ac	Top Web Interview Questions And Answers PartThe Web universe is constantly growing and evolving creating a high demand for experts who have a deep understanding of the field Snagging a job in the crypto sector takes a solid grasp on blockchain technology cryptography decentralized finance and more but it also promises to be a thrilling and fulfilling experience To help those eager to work in the crypto world we put together this comprehensive guide that offers a variety of interview questions covering multiple aspects of the crypto landscape Whether your goal is to become a blockchain developer cryptocurrency analyst smart contract evaluator or another cryptocurrency related role these interview questions will act as a valuable tool to help you get ready Prepping for a Crypto Interview The Getting ready for a crypto interview calls for a mix of technical knowledge a comprehension of the industry and the know how to express your opinions effectively Here are a few helpful suggestions for your prep Learn the Basics Start by establishing a strong foundation in cryptocurrencies blockchain technology and related concepts Grasp key terms consensus protocols cryptographic algorithms and blockchain network operations Get familiar with popular cryptocurrencies their applications and industry challenges and opportunities Do Your Homework Find out about the company you re interviewing with its mission products and recent news or announcements See how their work lines up with your interests and strengths and be prepared to discuss how you can contribute to their specific goals and obstacles Stay in the Loop Keep up with current events and innovations in the crypto world Stay informed on issues such as regulatory updates new technologies market trends and notable projects This showcases your enthusiasm for the field and your ability to adapt to changes Understand Your Role Examine the job posting and grasp the particular skills and qualifications needed for the position Identify the areas where your experience and expertise correspond with the job requirements Be ready to offer anecdotes that emphasize your relevant accomplishments and problem solving abilities Practice Technical Questions Gear up for technical questions on topics like blockchain cryptography smart contracts or other relevant subjects Rehearse answering questions about consensus algorithms token standards scalability solutions and security concerns Review popular coding languages used in blockchain development such as Ethereum s Solidity and be prepared to discuss your experience with them Showcase Your Projects If you have crypto related projects or professional experience be ready to discuss them Emphasize your contributions the challenges you faced and the outcomes achieved Prove that you can implement your knowledge and skills in real world scenarios Hone Your Critical Thinking Crypto interviews might involve problem solving questions that require you to think critically and analytically Practice reasoning through intricate problems and verbalizing your thought process Exhibit your ability to dissect problems pinpoint potential solutions and assess trade offs Sharpen Your Communication Skills Effectively communicating your ideas is crucial during interviews Practice articulating your thoughts in a clear and concise manner Be ready to break down complex concepts into simple terms as your interviewers may have varying levels of technical know how Practice active listening to ensure you understand the question and offer relevant responses Be Inquisitive Develop insightful questions about the company team dynamics growth opportunities or industry trends to ask the interviewer This shows your genuine interest and active engagement in the conversation Pursue Mock Interviews and Feedback Set up practice interviews with friends mentors or colleagues who understand the crypto sector Get feedback on your technical knowledge communication style and areas needing improvement Use the feedback to polish your answers and boost your confidence How to Explain Blockchain in an InterviewWhen describing blockchain in an interview make sure you offer a clear and concise explanation Here s a simple definition of a blockchain Think of blockchain as a unique digital ledger or record keeping system that tracks transactions Picture a giant notebook that anyone can write in but once something is written it can t be changed or deleted Instead of being stored in a single place the information is spread across many computers around the world known as nodes These computers collaborate to ensure the information is accurate and secure Think of it as multiple people double checking and verifying information for accuracy Each transaction forms a group with other transactions creating a “block These blocks then interconnect and form a “chain hence the name blockchain Since the data is distributed across numerous computers and can t be easily altered the blockchain is extremely secure Altering records or gaming the system is nearly impossible as it would require changing the data on all the computers simultaneously While mainly associated with cryptocurrencies blockchain technology has uses in various sectors such as monitoring supply chains confirming digital identities and designing decentralized applications DApps that run on blockchains In a nutshell a blockchain is a special digital ledger that securely and transparently records transactions by storing the data on numerous computers It forms a chain of information that s difficult to tamper with providing trust and security in a decentralized manner What is the difference between crypto and web Cryptocurrency Crypto Cryptocurrency or “crypto refers to digital or virtual currencies that leverage cryptography for securing financial transactions controlling the creation of new units and verifying the transfer of assets Well known cryptocurrencies such as Bitcoin Ethereum and Litecoin operate on decentralized networks using cryptographic methods to ensure secure transactions and regulate the issuance of new units Cryptocurrencies function as mediums of exchange stores of value or units of account making possible peer to peer transactions without the necessity for intermediaries like banks Web Web short for Web signifies the proposed next generation of the internet This evolution intends to shift the internet from its current state primarily about information sharing to a decentralized user centric platform where individuals exert greater control over their data and peer to peer interactions operate independently of intermediaries Web aims to deliver a more decentralized transparent and user controlled internet powered by blockchain technology and decentralized network protocols The vision encompasses applications and platforms that place a premium on privacy security and user sovereignty Web s goal is to enable individuals to own and manage their own data participate in decentralized governance and engage in peer to peer transactions and interactions all without reliance on centralized entities While crypto is specifically related to digital currencies and the underlying cryptographic technologies Web envisions a broader scope seeking a decentralized internet ecosystem that employs blockchain and additional technologies to enable a more open secure and user centric online experience In summary crypto refers to digital currencies that use cryptography for secure transactions whereas Web represents the concept of a decentralized user centric internet that relies on blockchain and similar technologies to facilitate peer to peer interactions and grant users control over their data Crypto can be viewed as a subset of the wider Web vision What is the difference between crypto and blockchain Crypto and blockchain both pivotal elements in the decentralized space have distinct definitions and purposes Crypto Cryptocurrency boils down to a type of digital currency that utilizes cryptography to secure transactions control the creation of additional units and verify asset transfers Known cryptocurrencies include Bitcoin Ethereum and Litecoin all functioning on decentralized networks These utilize cryptographic techniques to safeguard transactions and regulate the generation of new units Cryptocurrencies can be used for peer to peer transactions acting as a medium of exchange a store of value or a unit of account all done without needing a middle man like a bank Blockchain On the other hand blockchain acts as a distributed ledger technology decentralized by nature and forms the backbone of many cryptocurrencies Bitcoin and Ethereum being prime examples It functions as a system for recording and certifying transactions across numerous computers or nodes within a network Comprising blocks the blockchain links together collections of transactions chronologically secured using cryptographic methods Each block holds a unique identifier or hash of the previous block creating a chain of blocks The genius behind blockchain technology lies in its ability to ensure transparency permanence and trust all while recording and validating transactions without reliance on a central authority In essence crypto refers to digital currencies that employ cryptography for secure transactions whereas blockchain is the underlying distributed ledger technology allowing for transparent and tamper proof transactions Crypto is a tangible product of the broader blockchain technology Can you explain the difference between a public key and a private key in the context of cryptocurrency The concepts of public keys private keys and blockchain technology play essential roles in cryptocurrency transactions They not only enable secure transacting but also ensure immutability Public Key vs Private Key in CryptocurrencyIn the context of cryptocurrency a public key and a private key form parts of the cryptographic principles that secure digital assets They are instrumental to asymmetric encryption algorithms used in cryptocurrency transactions A public key gets derived from a private key and is distributed openly acting as a receiving address for funds or messages While it s public it cannot unlock or retrieve funds it merely receives and holds them In contrast a private key is confidential and known only to the owner of the digital assets It is used to sign off on transactions or messages thereby confirming ownership and granting access to the associated funds or data It can somewhat be compared to a PIN for an ATM card One of the ingenious operations of this system is the ability for the public key to authenticate the signature of the private key without exposing the private key itself Essentially a public key encrypts and verifies while a private key decrypts and signs off What is a blockchain and how does it ensure security and immutability in cryptocurrency transactions A blockchain is a decentralized distributed digital ledger recording transactions across a network of computers or nodes It is essentially made up of a chain of blocks each containing a collection of transactions Several mechanisms within the blockchain structure ensure the security and immutability of cryptocurrency transactions Firstly transactions are grouped into blocks and these blocks are cryptographically linked to the preceding block forming a chain Altering a transaction in a block would necessitate modifications in all subsequent blocks a computationally and practically infeasible task as the chain lengthens Secondly most blockchain systems use consensus algorithms such as proof of work PoW or proof of stake PoS to validate and add new blocks to the chain These algorithms make certain that the majority of participants agree on the validity of transactions a step that shields the ledger from manipulative intents Additionally blockchain makes full use of cryptographic hash functions Each block in the chain carries its unique hash value which is determined by the data within the block Any modification to the block s data causes the hash value to change and this discrepancy is easily detected by other nodes in the network By integrating decentralization consensus algorithms cryptographic hashing and the chaining of blocks blockchain technology promisingly offers security and the quality of immutability to cryptocurrency transactions How do the proof of work and proof of stake consensus algorithms vary and what are their pros and cons Proof of Work PoW and Proof of Stake PoS serve as two commonly employed consensus algorithms in blockchain networks each demonstrating unique attributes and implications Proof of Work PoW requires network participants referred to as miners to solve intricate mathematical problems to authenticate transactions and incorporate new blocks into the chain This problem solving operation necessitates considerable computational power thereby imposing resource intensive demands on systems With PoW miners successfully crack the mathematical conundrums are rewarded by obtaining freshly minted cryptocurrency Key strengths of PoW consist of its robust security framework which demands that a majority of honest participants control more computational power than malicious ones to preserve the network s integrity However PoW carries limitations including significant energy consumption and scalability concerns due to the demanding computational requirements Contrarily Proof of Stake PoS opts for block validators based on the quantity of cryptocurrency tokens participants possess and are willing to “stake as a guarantee Validators are selected based on specific criteria such as the amount staked and the duration the tokens have been in their possession PoS surpasses PoW in terms of energy efficiency as it dispenses with the necessity for exhaustive computational work Moreover PoS facilities improved scalability since the validation process is typically faster Yet PoS has been critiqued for potentially centralizing control as it allows wealthier participants to exert greater influence on the consensus process Both consensus algorithms bring along their respective trade offs Therefore distinct blockchain networks select the algorithm that they believe best meets their tailored requirements and objectives Explain the cryptocurrency mining procedure What s its purpose and how does it impact the entire system Crypto mining is a critical process that ensures the verification and bundling of new transactions into blocks which are subsequently added to the blockchain in numerous cryptocurrency networks Miners oversee this operation and occupy a vital role within the broader ecosystem Crypto mining initiates when miners gather unconfirmed transactions across the network Afterward they enter a competition to crack a complex mathematical puzzle calling upon substantial computational power This problem solving task is notably resource intensive and demands extensive computational efforts The miner who first discovers a legitimate solution broadcasts this to the network Once the solution is verified the miner s block which encapsulates the solved puzzle and the validated transactions becomes a part of the blockchain To incentivize their commitment the miner receives freshly created cryptocurrency This system of rewarding miners with cryptocurrency serves as a major motivator encouraging them to persist in verifying transactions and fortifying the network Beyond adding new blocks to the blockchain mining contributes substantially to preserving network integrity and security The computational labors associated with mining deter ill intended actors from tampering with past transactions or forging illegitimate blocks Mining consensus mechanisms such as PoW ensure the agreement of the majority of participants regarding the validity of transactions thus preventing the occurrence of double spending Despite the significant role that mining plays it has been criticized for its high energy consumption and the need for specialized hardware These limitations have raised concerns about the environmental implications of crypto mining Consequently some blockchain networks are investigating possible alternatives including PoS which might mitigate these environmental impact concerns while still preserving network security and integrity What do we mean by a smart contract and how does it support decentralized applications DApps on blockchain networks A smart contract is a self executing digital contract that is stored and executed on a blockchain platform It consists of predefined rules and conditions expressed in code that trigger automatic execution once the specific criteria are achieved Smart contracts empower decentralized applications DApps to function on blockchain platforms In comparison to traditional contracts that typically involve intermediaries like lawyers or financial institutions to enforce and verify terms smart contracts bypass the need for such intermediaries by harnessing the decentralized and transparent properties of blockchain technology Smart contracts bestow several benefits on DApps They facilitate trustless and transparent functioning as the code is open to public access and its behaviors can be reviewed by any participant on the blockchain Owing to its unalterability post deployment a smart contract ensures immutability and eradicates the probability of fraud or manipulations DApps capitalize on smart contracts by employing them as the logic and rules mechanism for their operations The user friendly interface of the DApp interacts with the smart contract enabling users to engage with the application and initiate actions as per the pre established rules Thanks to the decentralized nature of blockchain platforms the execution of smart contracts is impervious to tampering and verifiable by all involved parties What are the different types of forks and how do they impact the network and its users At its core a cryptocurrency fork signifies a split or divergence in the blockchain network This can result in multiple versions of the blockchain operating simultaneously The reasons for such a split vary it could stem from protocol changes community disputes or the introduction of innovative features Breaking it down there are two main categories of forks Hard Forks Imagine a complete makeover A hard fork ushers in significant protocol alterations that make the new blockchain incompatible with its predecessor This type of fork often mandates users and node operators to update their software to be in sync with the latest network A consequence A brand new cryptocurrency might emerge Famous examples include Bitcoin Cash BCH and Ethereum Classic ETC Soft Forks Think of this as a subtle upgrade Soft forks are backwards compatible While they do introduce new rules they remain within the boundaries of the existing ones Nodes operating older software versions can continue validating transactions though they might miss out on some fresh features A prime illustration of a soft fork is Bitcoin s Segregated Witness SegWit implementation But why should you care about forks Forks can reshape the crypto landscape in multiple ways New Cryptocurrencies As with Bitcoin Cash and Ethereum Classic forks can birth new digital currencies Community Rifts Forks can sow discord in the community Different groups may champion opposing visions for the network leading to potential splits User Clarity Forks can be a tad confusing for everyday users It s crucial to be informed about which blockchain version you re dealing with and if there are any necessary steps on your part like updating wallets or deciding between chains While forks might seem complex understanding their nuances can empower you to navigate the crypto space with confidence Stay tuned for Part Follow me and talentslab io for career tips and exciting opportunities in Web	2023-08-19 13:42:37
海外TECH	DEV Community	Mastering Code Assignments: A Frontend Engineer's Journey with React and REST API	https://dev.to/madhavigaikwad/mastering-code-assignments-a-frontend-engineers-journey-with-react-and-rest-api-1l3d	Mastering Code Assignments A Frontend Engineer x s Journey with React and REST APICode assignments have become a quintessential part of technical interviews enabling both candidates and interviewers to gauge real world coding skills and problem solving abilities For frontend engineers these assignments often involve developing a user interface using popular libraries like React and interacting with backend services through REST APIs In this article we ll delve into the experience of a frontend engineer named Maggie as she tackles a code assignment that involves building a React application and testing it using curl commands against a REST API The Assignment Building a React ApplicationOur hypothetical frontend engineer Maggie receives a code assignment from a prospective employer The assignment requires building a simple yet functional user interface using React The UI needs to fetch data from a REST API display it in a user friendly manner and offer basic interactivity Here s a step by step walkthrough of Maggie s journey Understanding the RequirementsThe first and foremost step is for Maggie to thoroughly understand the assignment s requirements She spends time dissecting the provided instructions assessing the expected features and identifying any potential challenges Setting Up the ProjectTo begin Maggie initializes a new React project using a tool like Create React App This project structure provides a solid foundation for building the application The command line tool generates a boilerplate codebase with a folder structure build configurations and package management Designing the User InterfaceWith the project set up Maggie designs the user interface This involves creating React components setting up routes if necessary and establishing a clear design pattern for the application The goal is to create an intuitive and visually appealing interface that aligns with the assignment s requirements Integrating the REST APIThe core functionality of the assignment revolves around interacting with a REST API Maggie uses the fetch API or libraries like axios to make HTTP requests to the provided API endpoints The received data is then integrated into the React components ensuring that the user interface reflects the fetched information accurately Displaying Data DynamicallyMaggie focuses on displaying the fetched data in a dynamic manner within the user interface This might involve rendering lists tables or cards based on the received API responses She also implements error handling to manage cases where API requests fail or return unexpected data Implementing InteractivityTo enhance user engagement Maggie adds interactivity to the application This could include features like sorting filtering or pagination based on user actions State management libraries like Redux might be employed to handle complex application states Styling and ResponsivenessWith the core functionality in place Maggie turns her attention to styling the application Using CSS or CSS in JS libraries like styled components she ensures the UI is visually appealing and responsive across various devices and screen sizes Testing the Application with curlAs part of the assignment Maggie needs to demonstrate the application s interaction with the REST API using curl commands This step is crucial to showcase that the frontend and backend are integrated seamlessly Testing with curl Bridging Frontend and Backendcurl is a command line tool that allows making HTTP requests and receiving responses from a terminal or command prompt It s commonly used for testing REST APIs and ensuring they function as expected For Maggie this step involves the following Testing API EndpointsMaggie uses curl to simulate API requests from the frontend This involves sending GET POST PUT or DELETE requests to different endpoints of the REST API By analyzing the curl responses Maggie can verify that the API endpoints are correctly implemented and returning the expected data Handling AuthenticationIf the API requires authentication Maggie configures curl commands with the necessary headers or tokens to simulate authenticated requests This ensures that the application s authentication flow is working seamlessly Analyzing ResponsesThe responses obtained from curl help Maggie assess the correctness of the frontend backend communication This step is crucial for debugging and identifying any discrepancies between the expected and actual responses ConclusionIn the world of frontend development engineers like Maggie transform ideas into digital experiences Maggie s journey through a code assignment involving React and REST APIs showcases her skills and creativity From grasping the assignment s requirements to using tools like curl to test API interactions Maggie s process highlights the art of creating functional and visually appealing applications Mastering such assignments not only impresses potential employers but also demonstrates Maggie s ability to build robust and interactive web applications that users love	2023-08-19 13:33:21
海外TECH	DEV Community	Use of Golang	https://dev.to/diwakarkashyap/use-of-golang-2j81	Use of Golangtoday i start learning Golang so everyday i will write a blog Go often referred to as Golang because of its domain name golang org is a statically typed compiled language developed by Google It was designed to be simple efficient and reliable and has since gained popularity for a variety of uses Here are some common use cases and advantages of Go Web Servers and Microservices Go s standard library has powerful primitives for building HTTP servers Due to its performance and ease of deployment single binary it has become a popular choice for building microservices Concurrent Processing Go has built in support for concurrent programming using goroutines and channels This makes it relatively straightforward to write programs that efficiently use multi core processors Networking Tools Go s standard library includes packages for building TCP UDP servers doing DNS lookups and more making it suitable for building various networking tools Command line Tools The ability to compile a Go program to a single static binary makes it ideal for building command line tools that are easy to distribute Cloud Services and Infrastructure Companies like Google Dropbox and Docker use Go for various components of their infrastructure Kubernetes a popular container orchestration platform is written in Go Data Pipelines Go s efficiency and concurrency support make it suitable for building data processing pipelines Embedded Systems and IoT While not as common Go can be used in some embedded systems and IoT devices Desktop Applications Though Go isn t typically the first choice for GUI applications there are libraries and frameworks like fyne that allow for the creation of cross platform GUI apps in Go Advantages of Go Performance As a compiled language Go programs typically run faster than interpreted languages like Python or Ruby Simplicity Go s syntax is designed to be clean and straightforward which can lead to more readable and maintainable code Static Typing Go s static type system helps catch errors during compile time rather than at runtime Standard Library Go has a comprehensive standard library particularly for web servers text processing and file handling Cross compilation It s easy to compile Go code for multiple platforms e g Linux macOS Windows Garbage Collection Go manages memory automatically freeing developers from manual memory management while still achieving high performance Built in Testing Framework Go comes with a lightweight testing framework out of the box Single Binary Deployment Go compiles to a single binary which simplifies deployment and eliminates runtime dependencies However like all languages Go has its drawbacks and might not be the best choice for every situation For example it s not typically the first choice for GUI applications or machine learning But for the use cases mentioned above Go offers a compelling option Thank you for reading I encourage you to follow me on Twitter where I regularly share content about JavaScript and React as well as contribute to open source projects and learning golang I am currently seeking a remote job or internship Twitter GitHub Portfolio	2023-08-19 13:09:22
Apple	AppleInsider - Frontpage News	Daily Deals Aug. 19: $150 off Mac Studio, 50% off JBL Tune 230NL TWS Headphones, Up to 25% off Keurig Brewers and Accessories	https://appleinsider.com/articles/23/08/19/daily-deals-aug-19-150-off-mac-studio-50-off-jbl-tune-230nl-tws-headphones-up-to-25-off-keurig-brewers-and-accessories?utm_medium=rss	Daily Deals Aug off Mac Studio off JBL Tune NL TWS Headphones Up to off Keurig Brewers and AccessoriesToday s top deals include up to off Sony headphones off TP Link Deco AX Wi Fi Mesh Wi Fi off a inch Insignia F LED K Smart Fire TV and more Deals Get off a Mac StudioThe AppleInsider crew searches the web for unbeatable deals at ecommerce stores to showcase high quality bargains on popular tech items including deals on Apple gadgets TVs accessories and other gadgets We post our most valuable finds daily to help you stretch your dollar Read more	2023-08-19 13:27:09
海外科学	NYT > Science	How Nursing Homes Failed to Protect Residents From Covid	https://www.nytimes.com/2023/08/19/health/nursing-homes-covid.html	How Nursing Homes Failed to Protect Residents From CovidA series of hurdles prevented the facilities from shielding older people despite the best efforts of staff Experts are calling for reforms before the next virus arrives	2023-08-19 13:55:35
ニュース	BBC News - Home	Lucy Letby: Concerns inquiry will not have enough powers	https://www.bbc.co.uk/news/uk-66553245?at_medium=RSS&at_campaign=KARANGA	letby	2023-08-19 13:18:33
ニュース	BBC News - Home	Sweden 2-0 Australia: Kosovare Asllani stunner secures World Cup bronze for Sweden	https://www.bbc.co.uk/sport/football/66543416?at_medium=RSS&at_campaign=KARANGA	Sweden Australia Kosovare Asllani stunner secures World Cup bronze for SwedenKosovare Asllani s stunning second half strike seals victory for Sweden as they beat Australia to finish third at the Women s World Cup at Brisbane Stadium	2023-08-19 13:00:59
ニュース	BBC News - Home	UK weather: Storm Betty brings more August wind and rain	https://www.bbc.co.uk/news/uk-66554592?at_medium=RSS&at_campaign=KARANGA	august	2023-08-19 13:02:07
ニュース	BBC News - Home	Sara Sharif murder inquiry: Searches continue for father of 10-year-old	https://www.bbc.co.uk/news/uk-england-surrey-66554083?at_medium=RSS&at_campaign=KARANGA	urfan	2023-08-19 13:31:51