132 Stories To Learn About Performanceby@learn
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132 Stories To Learn About Performance

by Learn RepoMay 25th, 2023
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Learn everything you need to know about Performance via these 132 free HackerNoon stories.

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Let's learn about Performance via these 132 free stories. They are ordered by most time reading created on HackerNoon. Visit the /Learn Repo to find the most read stories about any technology.

Articles for you and your projects to reach peak performance. Enter the Debugging Writing Contest today to win from $1000 monthly prize pool!

1. How You Can Measure and Evaluate Performance of Software Engineers

Engineers need feedback so they can improve skills and deepen knowledge. According to the editor of the Inc. Magazine, Jeff Hayden, traditional metrics can be misleading, as they do not always offer a clear result. Evaluating the work of staff used to be difficult, before Git Analytics tools, such as Waydev came up with a data-driven approach to engineering leadership to help you bring out the best in your engineers.

2. “Python Is Slow” and Other Myths of a Dying Era

This article addresses misconceptions and the realities of Python compilers and libraries that enable the writing of ultra-fast programs.

3. React Tutorial: How To Build a Virtualized List with Infinite Scroll and a Hook

When rendering a large set of data (e.g. list, table, etc.) in React, we all face performance/memory troubles. However, we can use the technique of DOM recycling to solve the troubles.

4. Tips For Profiling Your Spring Boot Application Using VisualVM

According to Wikipedia, Software profiling is a form of dynamic program analysis that measures, for example, the space (memory) or time complexity of a program, the usage of particular instructions, or the frequency and duration of function calls.

5. Performance increase of Data Pipelines from S3 to Dynamodb

AWS data pipelines are one of the best mechanisms to transfer data from one storage to another storage with a different data type. While transferring data from pipelines, there are several techniques which can be used to optimize the process of copying data. In this article, the scenario would be copying 3 CSV format files which are stored in S3 bucket, to 3 Dynamodb tables.

6. Why and where should you still use C/C++ languages?

From complex databases to self-driving cars, the usage area of C and C++ languages is surprisingly wide. Even today, with a myriad of new & robust programming tools, the two coding languages from 70s cannot be replaced. So what are the common applications of C & C++ today and why we still use them? Let’s find out in this article.

7. Another approach to design API for improved performance!

GraphQL is an amazing specification, no doubt about that. I loved it when it first came into my knowledge but as I started learning it, well, I started to hate it and I still do at some extent because I am still learning it. So much boilerplate code to even starting the graphQL server.

8. Is Lodash That Good? Performance Comparison of JavaScript and Lodash

Lodash is a very popular JavaScript library and I have come across it in almost every project I have, but was it justified? is she that good? let's find out in

9. React Hooks: Performance Pitfalls And How To Easily Avoid Them

From version 16.8.0, React introduced us to a way to use state and other React features without writing a class — React Hooks.

10. Why Math Functions in C++ Are So Slow

Why C++ math functions can be slow and how to fix them

11. A Performance Optimization of Flutter WebView

This article records a performance optimization of the WebView based Flutter data visualization library: echarts_flutter .

12. How I Got My Website To Load in 1 Second

The front page of loads less than a second, most of the time, from various parts of the world.

13. How Libuv Thread Pool Can Boost Your Node JS Performance

In this 5th instalment of my “Node JS Performance Optimizations” series, I show you how to increase Node JS performance with thread pool management. We achieve this by understanding how Libuv works, how the thread pool works and how to configure the number of threads based on your machine specs.

14. Improving React App Performance with SSR and Rust: Rust vs Node.js [Part III]

In theory, a new technology or a modern approach should have a lot of benefits, but the main question that matters is that - what is actually practical advantages of that in numbers?

15. Optimizing String Comparisons in Go

Want your Go programs to run faster? Optimizing string comparisons in Go can improve your application’s response time and help scalability. Comparing two strings to see if they’re equal takes processing power, but not all comparisons are the same.

16. Iterating Over JavaScript Object Entries and their Performance - 5 Techniques

This post includes 5 different ways for iterating over JavaScript Object entries and a performance comparison of those techniques.

17. Please Don't Use OFFSET and LIMIT For Your Pagination

Gone are the days when we wouldn’t need to worry about database performance optimization.

18. Mastering MongoDB - currentOp

“Dashboard in the pilot's cockpit” by Mitchel Boot on Unsplash

19. Improving Formik Performance when it's Slow (Material UI)

Fix Formik slow performance. Increase Formik performance when using input fields. Happens when you use CSS-In-JS based UI libraries as they keep re-rendering.

20. #NoBrainers: You Need A High Performing Low Latency Distributed Database

Certain industries greatly benefit from high-performing, low-latency, geo-distributed technologies.

21. Meet the Writer: HackerNoon's Contributor Nikita Starichenko, SWE at Snap Inc.

From Engineering to Surfing!

22. Eliminating Event Storms With Debouncing in JavaScript

Using debounce, the function will be executed only when a certain amount of time has passed since the last function call.

23. The #MobileDebugging Writing Contest: Share Your Story and Win from $6000

Write about a time when you struggled (and later, triumphed) to identify a bug or performance issue in your mobile application and win from $6000!

24. Short Circuit Evaluation: What You Need to Know

Short circuit evaluation, like many other useful programming concepts, is not hard and gives you a much better performance.

25. How To Use Debounce in Next.js

Understanding Debounce in Next.js

26. Forget Story Points and Use this Instead

After decades of using story points estimations, we see its limitations. It ignores the human factor.

27. 7 Ways to Optimize Your Agile Testing Strategy

In this article, you will find some tips to streamline and improve your Agile testing strategy.

28. Top 5 TypeScript Performance Tips

Hi everyone! Today I want to talk about fast TS compilation. There are a lot of tips and tricks about TypeScript code style. But not about compiler performance.

29. How to Program with React Native: Lessons & Best Practices

Here are some lessons and best practices I've compiled after 2 years with React Native.

30. How To Improve Your Docker Build Time in GitLab CI

Make your containerized CI environments truly useful by accelerating your Docker builds

31. Blockchain performance issues and limitations


32. Meet John Jardin - #Noonies2021 Nominee, Full Stack Developer, CEO of Agilit-e

Through his 21 year journey as a developer, John Jardin has managed over 350 projects for various companies. Learn more via this exclusive interview.

33. 5 Key Valuation Ratios Every Company Founder Should Know

Ratios of valuation are important in establishing a company's value. A valuation ratio expresses the link between a company's market value or equity and a basic

34. Breaking the Distributed Database Performance Record with 10 Million tpmC!

Apache ShardingSphere & openGauss: Breaking the Distributed Database Performance Record with 10 Million tpmC.

35. Profiling Java Applications with Async Profiler

Disclaimer: This story is not sponsored by Async Profiler.

36. The Ultimate Guide to Blazing-Fast Performance in Ruby on Rails

Ruby on Rails is a tremendous framework when you want development speed for your project or startup. It’s useful right out of the box and comes with a plethora of behind-the-scenes magic to make your life easier. However, it’s not considered the fastest framework out there in terms of performance. You will find examples of individuals and companies drifting away from Rails in favour of something else. Despite this, there are many companies out there who have succeeded in scaling Rails and found success — just take a look at Airbnb, Github, Gitlab & Shopify.

37. Tips, Tools, and Best Practices for Optimizing Unit Testing in JavaScript

Learn how to improve the performance of your JavaScript unit tests with this comprehensive guide.

38. A Deep Dive into How Typescript Enums Work

Enums, short for Enumerations, are preset constants that can be defined by a developer for use elsewhere in the code.

39. A New Approach to Solve I/O Challenges in the Machine Learning Pipeline

Training and caching data can be done in a transparent and distributed way to improve training performance and simplify data management.

40. Observability vs Monitoring: What's the Difference?

Monitoring has been a basic system to track the health of servers for years. Now it is not enough.

41. How to Manage Multithreaded Node JS Applications for Better Performance

In this post I'm going to show you how to potentially triple your Node application's performance by managing multiple threads.

42. Faster than Linux

FTL usually refers to "faster than light". A theoretical particle known as a tachyon that powers certain spaceships in the Star Trek universe keeps the plot going for decades through multiple series and and movie franchises.

43. Performance Anxiety Amongst Employees and How to Overcome It

Performance anxiety amongst employees can be a serious issue. It may have a serious effect on a person’s health, sleep, mood, and even self-worth. Let’s look at

44. The Existence of Gender Gap in Leadership Goals

Gender gap has started to gain attention with changing times. The world has started to witness change in the way female employees are treated.

45. Building a Large-Scale Interactive SQL Query Engine with Open Source Software

This is a collaboration between Baolong Mao's team at and my team at Alluxio. The original article was published on Alluxio's blog. This article describes how JD built an interactive OLAP platform combining two open-source technologies: Presto and Alluxio.

46. Accelerating Analytics by 200% with Impala, Alluxio, and HDFS at Tencent

This article describes how engineers in the Data Service Center (DSC) at Tencent PCG (Platform and Content Business Group) leverages Alluxio to optimize the analytics performance and minimize the operating costs in building Tencent Beacon Growing, a real-time data analytics platform.

47. 6 Must Buy Graphics Cards for Cryptocurrency Mining

What are the options for the best graphics cards for cryptocurrency mining? Here is a study.

48. Fine-tune Your Product In No Time

Being experts in the IT industry, we at QAWERK know about the importance of testing and want to share this knowledge as we believe high-quality software is the key to success.

49. Solved a Software Performance Issue? Share Your Story and Win $$$!

Hey Hackers! Do you have a kick-ass software performance story to share? Here’s your chance to win money from a $1000 monthly prize pool.

50. Top 10 CSS Performance Tips

Hi everyone! There are a lot of tips and tricks about CSS styling. But not in this article. Today I want to talk about how to use CSS more efficiently and make

51. 7 Optimization Recommendations for JavaScript Developers

In this article, I'll share 7 optimization tips that every JavaScript developer should know.

52. A Quick Tutorial to Hashcode and Equals Debugging

Standard Java methods hashcode and equals are crucial to performance but this is very hard to detect as they're often too small for profilers

53. Code Reviews And Why They Matter For Developers Performace

We used to think that the secret to getting better at anything was directly linked to the timed dedicated to practice (we’ve all heard about the 10, 000 hours that stand between us and achieving mastery in any field) but, as in turns out, it’s not how much we practice but also how we do it. According to psychologist Andres Ericsson, “deliberate practice” is what matters and makes a huge difference in achieving expert performance.

54. How to Choose the Best Apps for Your Business

Key strategies to pick the best apps for your business

55. 7 Easy Steps to Set Up Google Analytics on Your Next.JS Website

A guide to help you set up Google Analytics 4 on your Next.js website.

56. Optimizing Performance With Throttling in JavaScript

Throttling allows you to "slow down" the function, i.e. the function will be executed no more than once in the specified period, even if it is called many times

57. The Future of Mobile Game Promotion and Advertising

One of the challenges that game developers and publishers face now and will continue to face in the future is the proper promotion of their creations.

58. Maximize the Performance of Your Django App with these Techniques

Learn about caching, database optimization, minimizing queries, using CDN, profiling & monitoring, and more. Boost your app's speed and efficiency today!

59. Solving Performance Issues with .filter() and .map() Used in Conjunction

Post their introduction, .map() and .filter() are used in conjunction to death galore in code nowadays because “it’s so easy”. But does blindly using these methods cause performance issues in your code? Let us dig in and find out. I am not going to get into the details of how these functions work because there is TONS of material available for the same.

60. Better Performance and Security by Monitoring Logs, Metrics, and More

Monitoring is a crucial part of observability. Learn how monitoring can specifically improve security, performance, and reliability.

61. Understanding How UUIDs Save Time and Storage

Learn more about the universally unique identifier (UUID) and how using UUID in your QuestDB instance can help reduce query time as well as save storage space.

62. JMXTerm-An Open-Source Debugging Tool

Monitor your application in production or locally. Understand what's going on under the hood while debugging & change application settings on the fly.

63. Throttling vs Debouncing in Javascript

Throttling and debouncing, what are they? What is the difference and when and why should we use them in our own javascript-based programming projects?

64. Accelerating Write-Intensive Data Workloads on AWS S3

We introduce Replicated Async Write to allow users to complete writes to Alluxio file system and return quickly with high application performance.

65. How to Benchmark the End-to-End Performance of Different I/O Solutions for Model Training

This blog demonstrates how to set up and benchmark the end-to-end performance of the model training process.

66. Monitoring Your WebRTC Applications’ Performance Can Tremendously Improve Your User Experience

The last thing a business wants is to be known as an unreliable and poorly performing service, especially if there are similar solutions a few clicks away.

67. Think Like Einstein to Achieve Your Goals

Focus Like Einstein (And Win Big)

68. Salesforce Functions for Caching Expensive Queries

In this article, we will walk through the use of Salesforce Functions to cache expensive queries.

69. What Tools You Must Use to Measure Your Product Performance

Performance testing is a very crucial part of quality control for many applications. If an application is supposed to support multiple connections and/or numerous calls to a server, then it’s very important to be sure that it can handle the load. What’s good about an app that processes user’s requests at a snail pace?

70. How To Run Cloud-Native Performance Benchmarks with Kubestone


71. How to Optimize the User Experience and Performance via Node.js and Lighthouse

Why should you concentrate your energy in optimizing the user interface and the user experience of your application instead of focusing on performance side?

72. Master the Art of Public Speaking with these 8 Simple Tips

It's been a week of preparation and you’ve rehearsed in front everything and everyone, including, but notwithstanding mirrors, husbands and even cats. You’re geared up and ready to go. The stage is set, you start talking and within a few minutes, half of your audience, instead of glazing at you, locks their eyes into their gadgets. How to keep people entertained and win back those whose attention you’ve lost? I’ve uncovered the eight secrets of successful stage performance, which will help you keep even the most capricious audience.

73. Build, Monitor and Troubleshoot Your Smart Contracts on RSK with Tenderly

Smart Contracts Monitoring Platform Tenderly has added support for RSK. Developers working with RSK can now make use of Tenderly’s seamless tools.

74. Optimize Your Front End Applications by Migrating From Moment to Dayjs

Does your application use dates in some way?

75. Understanding APIs and How to Test Them

API (an abbreviation of Application Programming Interface) is a special interface (a set of commands/controls) that is designed for the interaction of different

76. Quality Assurance in Scrum Projects

Scrum is a set of rules for organizing a flexible workflow, which consists of a team approach, working in iterations, focusing on the goal of each iteration.

77. Performance Appraisals Today Are Not Agile

We are in the age of the Agile revolution, even non-tech companies and non-tech departments are adopting agile practices and frameworks. The issue is that organizations are making these adoptions without changing the foundation that their companies are built on. One of these major pillars is performance appraisals and it is critical because it is very important to employees. We all want to do well, and get big bonuses, or even get that promotion that we have been working so hard towards. The issue is most companies do not have the Agile mindset and focus mainly on the individual and neglect the team aspect when it comes to performance. This directly hurts organizations that are looking to build mature Agile teams.

78. Instance Comparison Chart: Find The Right AWS EC2 Instance

So you’ve decided to choose AWS as the primary provider of your cloud service and now you’re looking into setting up your environment. You’ve got your project to be deployed and all you have left to do is choose an AWS instance that will run your machine image. But now, like many others before you, you are stumped by the countless choices of EC2 instances out there.

79. #Debugging Writing Contest 2022: Round 2 Results Announced

The wait is over. The Round 2 results for Debugging Writing Contest held with Sentry are here!!

80. The Debugging Writing Contest 2022: Round 5 Results Announced!

Here are the nominees and winners for the 5th Round (August 2022) of Debugging Writing Contest by Sentry and HackerNoon.

81. The Debugging Writing Contest 2022: Round 3 Results Announced!

Round 3, here we go!! Let’s see the June winners of the Debugging Writing Contest by Sentry!

82. Structure brings order to Chaos: What is COVID all about?

Would the coronavirus pandemic bring out the new order or merely restructure the present order to make way for the business world to adapt well?

83. Failure Modes: Why You Need To Know Them

What are bimodal failure modes and how to avoid them

84. Metadata Synchronization: Design, Implementation and Optimization

This article describes the design and the implementation in Alluxio to keep metadata synchronized.

85. Visual Testing of Patternlab and Drupal

What is Patternlab?

86. Navigation Timing API: How to Track Your Website Loading Performance

The Navigation Timing API provides data that can be used to measure the performance of a web site. Unlike JavaScript-based libraries that have historically been used to collect similar information, the Navigation Timing API can be much more accurate and reliable.

87. How to Measure Performance in FinTech Apps

Understand the mechanics of performance in FinTech and learn a few patterns that can maintain users’ attention and engagement.

88. Shrinking Choices, Shrinking Values - Property-based Testing (Part 5)

Explaining how property-based testing libraries like hypothesis shrink random values to make them easier to understand and debug.

89. How We Increased our Website Loading Time by 24%

Last weekend we had a chance to fine-tune the performance of SwissDev Jobs.

90. 3 Easy Ways to Improve The Performance Of Your Python Code

I. Benchmark, benchmark, benchmark

91. How to Optimize React Performace by Using useRef Hooks

And how we stopped our React Context re-rendering everything

92. Comparing XML and Compose Rendering Speed at Deep and Wide Nesting

There are many benchmarks that compare the performance and rendering speed of XML and compose.

93. JSWorld Conference 2022: Part II

JSWorld Conference is the number one JavaScript Conference in the world, and I share a summary of all the talks with you. Part II

94. 5 Performance Tips For .Net Developers

Hi everyone! Today I want to share with you some .Net 5 performance tips with benchmarking!

95. What Is so Great About Golang?

Check out why you should use golang for your next project

96. Graph Databases Introduction: The Power of Connected Data

In today's economy, more and more companies exist primarily online. While there's much discussion around the consequences of leaving behind the traditional brick and mortar business, one aspect that gets less attention is the significant change in how these companies are now managing their data. Increasingly, businesses seek to understand their customers and how best to meet their needs in a way that monthly reports and KPI charts just can’t address.

97. How Observability and Monitoring Produces Better Software

An article focused on deep diving into observability and its significance in software. Its history, goals, the importance of observability, and the issues that

98. How to use Javascript's Performance API and measure page performance

The High Resolution Time standard defines a Performance interface that supports client-side latency measurements within applications. The Performance interfaces are considered high resolution because they are accurate to a thousandth of a millisecond (subject to hardware or software constraints). The interfaces support a number of use cases including calculating frame-rates (potentially important in animations) and benchmarking (such as the time to load a resource).

99. Postgres and MySQL: Performance Comparisson

What workload analysis and running queries can teach us about the performance differences in JSON, indexing, and concurrency.

100. The New MacBook Air is Better than the M1 Max for Java Development

In shocking development, new computer is faster than the old one. In this case the new thin air beats a newish thicker M1 Max top of the line machine.

101. Is the App Shell Model an Innovation in Web Development?

A few days ago I somehow ended up on Google's platform, which I'm assuming is rather new. There is of course the possibility that I have been–or still am–living under a rock, when it comes to new web technologies.

102. How To Monitor Your API Server

'Have you developed or are you in the process of creating an API Server that will be used on a production or cloud environment? In this 4th instalment of my Node JS Performance Optimizations series, I show you how to test the availability of your API Server, so that you can understand how many requests per second it can handle whilst performing heavy duty tasks.

103. How to Optimize Your Web Server for Better Website Performance

In this digital world, the success of your website lies in its first impression and user experience. A website that takes a loading time more than a blink of an eye makes them so frustrated and abandoned the website. It can create an adverse impact on search engine ranking and business of that website.

104. Why You Should Care About Homomorphic Encryption

The hype is dead, long live the hype. After deep learning, a new entry is about ready to go on stage. The usual journalists are warming up their keyboards for blogs, news feeds, tweets, in one word, hype. This time it’s all about privacy and data confidentiality. The new words, homomorphic encryption.

105. Testing the Perfornace and Privacy Settings of COVID-19 Vaccine Websites

The government websites responsible for helping citizens get their COVID-19 Vaccines have been found to have less-than-ideal accessibility and privacy features.

106. Does CPU Clock Speed Impact Your Blockchain Node?

If you are going to plan your Blockchain Network Deployment on AWS, Azure, GCP or even a Private Cloud. My question is how do you decide what metal should power it and then what's the definition of that Metal?

107. NodeJS: Code Execution Monitoring With Inspector

Have you ever desired to watch your code running, instead of just imagining it?

108. How to Improve eStore Performance with QA

A pandemic has become a tipping point for eCommerce. How to cope with the skyrocketed number of shoppers and succeed amid long-term changes? Welcome to find the

109. Strategies For Mobile App Performance Testing

A good app is one that can perform better and these performances are tested through some performance matrices which are highlighted here.

110. Essential Programming Versus Time Complexity

In computer programming, as in other aspects of life, there are different ways of solving a problem. These different ways may imply different times, computational power, or any other metric you choose, so we need to compare the efficiency of different approaches to pick up the right one.

111. How to Choose the Best Apps for Your Business

Key strategies to pick the best apps for your business

112. The Debugging Writing Contest 2022: Final Round Results Announcement

YAAAASSSSS, it’s the Finale! Welcome to the final round results of the Debugging Writing Contest by Sentry!

113. A Guide to Improving Your Python Performance Speed

This guide aims to summarize popular methods for boosting the execution speed of your Python code.

114. How Using AWS Lambda with Rust Saved 3x the Cost Compared to Using Python or .NET

When building for large-scale use, using Rust certainly feels worth it both from a cost perspective (factor x3 saved) and from a performance perspective.

115. Lessons for Improving Training Performance — Part 1

Part 1: Lower precision & larger batch size are standard now

116. Assessing Model Performance in Secrets Detection: Accuracy, Precision And Recall

Detecting secrets in source code is like finding needles in a haystack: there are a lot more sticks than there are needles, and you don’t know how many needles might be in the haystack. In the case of secrets detection, you don’t even know what all the needles look like!

117. My $0 Biohacking Journey to Completing Ultra-Marathons

This article details my $0 biohacking journey to ultra-marathons, health, fitness, and more

118. The Best Solution Ever For Application Monitoring

Just because we do something one way, doesn’t always mean it is the right way … or even the best way.

119. If Formula-1 Defined Efficiency

This is what it would be

120. Boost Mobile Performance To Better UX

What’s one of the biggest predictors of mobile app success? Performance. Here’s how to whip yours into shape so mobile app performance problems don’t cost you downloads, revenue, and brand perception.

121. Loaded in 600 Milliseconds: How To Improve Website Speed

Learn how to bump up your website load time and improve performance in less than a day with concrete examples

122. The Debugging Writing Contest 2022: Round 4 Results Announced!

Heyo! Here we are with the Round 4 of the Debugging Writing Contest powered by Sentry and HackerNoon!

123. How To Find Origin And Context of JPA For Issued SQL Statements

ORM frameworks like Hibernate and other JPA implementors can significantly simplify development of persistence layer. Introducing entity abstraction level helps to model clean business domain and to hide underlying SQL statements used to achieve persistence of the domain. Such approach is especially useful in large domains, since developer no longer needs to create and maintain all SQL statements used by application.

124. Simple Tips For A Successful Application Performance Monitoring

You finally went live, congratulations! Now what?

125. Javascript Methods from Performance Timeline API

The Performance Timeline API defines extensions to the Performance interface to support client-side latency measurements within applications. The extensions provide interfaces to retrieve performance entry metrics based on specific filter criteria. The standard also includes interfaces that allow an application to define performance observer callbacks that are notified when specific performance events are added to the browser's performance timeline.

126. Data Fingerprinting in JavaScript

I want to talk a little about how you can use content-based addressing (aka data fingerprinting) as a general approach to make your applications faster and more secure with some practical JavaScript examples.

127. Velo How-To: On Performance Optimization And Data

Using data from database collections or from a 3rd-party source can be a powerful tool to enhance your site's functionality. However, sending a lot of data to the browser from the server can be a time-consuming operation and negatively affect your site's loading time. Therefore, you want to minimize the amount of data that is sent from the server to the browser.  This article lists a number of approaches you can use, whether you're using a dataset or the Data API, to improve your site's performance.

128. The critical request

The Critical Request

129. People With High Levels of Emotional Intelligence Perform Better at Work

Emotional intelligence is critical for leadership success, employee performance, and teamwork. Learn to develop your EI with coaching app LIFE Intelligence.

130. Explaining Important Skills For Hero Developers Using Lego Bricks

Programming is like building Lego bricks. Any developer can pick a brand new Lego set and build it following the instructions. This is very easy. Think of it as coding school assignments or entry level tutorials.

131. Adding Encryption to a Fast Database, Without Compromise

This article will be of particular interest to people who are curious about how powerful encryption can be implemented in high performance systems. It is also for people who just want to know a bit more about how strong encryption works and how all the pieces fit together.

132. JavaScript Typed Arrays: Beginners Guide

JavaScript typed arrays are array-like objects that provide a mechanism for reading and writing raw binary data in memory buffers. As you may already know, Array objects grow and shrink dynamically and can have any JavaScript value. JavaScript engines perform optimizations so that these arrays are fast.

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