Speed comparison of programming languages. This projects tries to compare the speed of different programming languages. In this project we don't really care about getting a precise calculation of pi. We only want to see how fast are the programming languages doing. It uses an implementation of the Leibniz formula for π to do the comparison.Ultimately, it is based on such comparisons that we propose a series of efficiency rankings, based on single and multiple criteria. Our results show interesting findings, such as how slower/faster languages can consume less/more energy, and how memory usage influences energy consumption.Haskell (/ ˈ h æ s k əl /) is a general-purpose, statically-typed, purely functional programming language with type inference and lazy evaluation. [26] [27] Designed for teaching, research, and industrial applications, Haskell has pioneered a number of programming language features such as type classes , which enable type-safe operator ...Sep 5, 2023 · The Football Power Index (FPI) is a measure of team strength that is meant to be the best predictor of a team's performance going forward for the rest of the season. FPI represents how many points ... 1.4.2 Programming Method(ologie)s: Advances in methods of programming also have influenced language design, of course. Refinements in thinking about flow of control led to better language constructs for selection (i.e., if statements) and loops that force the programmer to be disciplined in the use of jumps/branching (by hiding them). Jan 25, 2023 · Python is a relatively new programming language, first introduced in 1989, that has surged in popularity with the emergence of new fields of application. It is an interpreted language that supports automatic memory management and object-oriented programming. It heavily prioritizes developer experience. The reason why it does not top the list is that it is a dynamic language. 4. Fortran. Fortran is a general-purpose language used for scientific calculations. It is known for its high performance and is used in ranking the fastest supercomputers. Fortran is widely used for numerical programming since it is faster.Nov 2, 2022 · The idea transmuted over to software programming languages—surely a faster language was a greener one, the logic went. That all changed in 2017 thanks to a group of researchers in Portugal who use what’s called the Computer Language Benchmarks Game (CLBG) as a way of ranking software languages in terms of energy efficiency. May 10, 2020 · Python vs C++. Python is more memory efficient because of its automatic garbage collection as compared to C++ which does not support garbage collection. Python code is easy to learn, use and write as compare to C++ which is hard to understand and use because of its complex syntax. Python uses an interpreter to execute the code which makes it ... Ranking programming languages by energy efficiency R Pereira, M Couto, F Ribeiro, R Rua, J Cunha, JP Fernandes, J Saraiva Science of Computer Programming 205, 102609 , 2021RedMonk gives these rankings: 1 JavaScript 2 Java 3 Python 4 PHP 5 C# 6 C++ 7 CSS 8 Ruby 9 C 10 Objective-C 11 Swift 12 Shell 12 Scala 14 R 15 Go 15 Perl 17 TypeScript 18 PowerShell 19 Haskell 20 CoffeeScript 20 Lua 20 Matlab. Another ranking system, by Tiobe, ends up with a radically different top 20.The OECD DAC Network on Development Evaluation (EvalNet) has defined six evaluation criteria – relevance, coherence, effectiveness, efficiency, impact and sustainability – and two principles for their use. These criteria provide a normative framework used to determine the merit or worth of an intervention (policy, strategy, programme ...Energy-Languages Public. The complete set of tools for energy consumption analysis of programming languages, using Computer Language Benchmark Game. C 634 MIT 104 9 2 Updated on Apr 20, 2022. hunter-emanafa Public. hunter-emanafa.Overviews of the energy efficiency programs reviewed for this chapter are provided in Table 6-2 and 6-3. Key findings drawn from these programs include: • Energy efficiency resources are being acquired on aver age at about one-half the cost of the typical new power sources, and about one-third of the cost of nat Haskell (/ ˈ h æ s k əl /) is a general-purpose, statically-typed, purely functional programming language with type inference and lazy evaluation. [26] [27] Designed for teaching, research, and industrial applications, Haskell has pioneered a number of programming language features such as type classes , which enable type-safe operator ...What's the Most Efficient Language? It's 2025, and alien explorers from a distant planet are set to make first contact with Earth. Conveniently for us, they have a universal translator. Unfortunately, for us, they've intercepted far too many episodes of Jersey Shore and have a skewed perception of our species. So, in an effort to put humanity's ...The Department of Computer Science and Engineering (CSE) offers undergraduate and graduate programs of study in Computer Science , Computer Science and Business, and Data Science, along with research opportunities in these fields. Computer science, the core of includes the study of computer algorithms, software systems, and the effective use of ... Ranking programming languages by energy efficiency R Pereira, M Couto, F Ribeiro, R Rua, J Cunha, JP Fernandes, J Saraiva Science of Computer Programming, 102609 , 2021 Jul 26, 2016 · After two years in second place, C has finally edged out Java for the top spot. Staying in the top five, Python has swapped places with C++ to take the No. 3 position, and C# has fallen out of the ... This report presents the findings, conclusions and recommendations of the evaluation of the Energy Efficiency Program (EEP). This evaluation was conducted as specified in Natural Resources Canada’s (NRCan) Joint Audit and Evaluation Plan 2018-2021, and in accordance with the Treasury Board Policy on Results (2016).The lambda calculus, developed in the 1930s by Alonzo Church, is a formal system of computation built from function application. In 1937 Alan Turing proved that the lambda calculus and Turing machines are equivalent models of computation, [36] showing that the lambda calculus is Turing complete. Lambda calculus forms the basis of all functional ...Feb 13, 2022 · 7. C#. For the last many years, C# is holding a good position in the list of top programming languages of almost every index. The language is ranked at 4th and 5th position at TIOBE and PYPL index respectively. On GitHub Language Rankings, it holds a place at the #5 position consistently for the last two years. Algorithmic efficiency. In computer science, algorithmic efficiency is a property of an algorithm which relates to the amount of computational resources used by the algorithm. An algorithm must be analyzed to determine its resource usage, and the efficiency of an algorithm can be measured based on the usage of different resources. Sep 5, 2023 · The Football Power Index (FPI) is a measure of team strength that is meant to be the best predictor of a team's performance going forward for the rest of the season. FPI represents how many points ... Most popular programming languages to learn in 2023. The following list outlines a few of the most popular programming languages among software developers worldwide [ 2 ]. 1. JavaScript. According to a study by Statista, JavaScript is the most popular language to learn. JavaScript (JS) is a scripting language used to make websites and mobile ...The Football Power Index (FPI) is a measure of team strength that is meant to be the best predictor of a team's performance going forward for the rest of the season. FPI represents how many points ...Energy efficiency across programming languages: how do energy, time, and memory relate? Authors: Rui Pereira , Marco Couto , Francisco Ribeiro , Rui Rua , Jácome Cunha , João Paulo Fernandes , João Saraiva Authors Info & ClaimsOn IEEE Spectrum 's Fixing the Future podcast, our editors talk with the brightest minds in technology about concrete solutions to big challenges.A comprehensive study on the energy efficiency of Java thread-safe collections. In Proceedings of ICSME, 2016. 48. Pinto G., Soares-Neto, F., and Castor, F. Refactoring for energy efficiency: A reflection on the state of the art. In Proceedings of GREENS, 2015. 49. Ribic, H. and Liu, Y.D. Energy-efficient work-stealing language runtimes.Ranking programming languages by energy efficiency R Pereira, M Couto, F Ribeiro, R Rua, J Cunha, JP Fernandes, J Saraiva Science of Computer Programming, 102609 , 2021About this report. Energy Efficiency 2021 is the IEA’s annual update on global developments in energy efficiency. This year’s edition explores recent trends in energy efficiency markets at the economy-wide and sectoral levels, including developments in policy and investment. The report also focuses on the role of energy efficiency in ...A comprehensive study on the energy efficiency of Java thread-safe collections. In Proceedings of ICSME, 2016. 48. Pinto G., Soares-Neto, F., and Castor, F. Refactoring for energy efficiency: A reflection on the state of the art. In Proceedings of GREENS, 2015. 49. Ribic, H. and Liu, Y.D. Energy-efficient work-stealing language runtimes.In 2023, Java claims the No. 3 spot in terms of the most in-demand programming languages. This object-oriented language is free to use and can run on all platforms. It’s often used in application and web development, and it’s also used on the backend of big-name sites like Google, YouTube, and Amazon. If you’re just learning how to code ...Investment in efficiency is projected to fall 9% in 2020. Travel restrictions and lockdowns are having major impacts on long-distance and urban transport. Transport sector energy consumption is projected to fall by 10% in 2020 compared with 2019, including an 11% drop in oil consumption of around 6 million barrels a day. Request PDF | Ranking programming languages by energy efficiency | This paper compares a large set of programming languages regarding their efficiency, including from an energetic point-of-view.Dec 22, 2022 · This table is an extract from a 2017 scientific article, Energy Efficiency Across Programming Languages, and it makes sense: compiled languages like C or C++ are fast and energy efficient while ... #software: the choice of language is not without consequences A study place in order C, Pascal, Ada as the least energy consuming https://lnkd.in/eFUyvZvX by…Jun 9, 2015 · What's the Most Efficient Language? It's 2025, and alien explorers from a distant planet are set to make first contact with Earth. Conveniently for us, they have a universal translator. Unfortunately, for us, they've intercepted far too many episodes of Jersey Shore and have a skewed perception of our species. So, in an effort to put humanity's ... Energy-Languages Public. The complete set of tools for energy consumption analysis of programming languages, using Computer Language Benchmark Game. C 634 MIT 104 9 2 Updated on Apr 20, 2022. hunter-emanafa Public. hunter-emanafa.May 10, 2020 · Python vs C++. Python is more memory efficient because of its automatic garbage collection as compared to C++ which does not support garbage collection. Python code is easy to learn, use and write as compare to C++ which is hard to understand and use because of its complex syntax. Python uses an interpreter to execute the code which makes it ... 2. Python. Number of jobs: 1,049,041. Average annual salary: $120,700. Benefits: Python is widely regarded as a programming language that’s easy to learn, due to its simple syntax, a large library of standards and toolkits, and integration with other popular programming languages such as C and C++.Broad adoption of Rust could reduce energy consumption of compute demands by a conservatively estimated 50%, Amazon wrote. Rust delivers the energy efficiency of the C programming language ...Jul 4, 2021 · Using the calculations from the previous article, we can estimate the yearly carbon impact: C#/WPF is around .00031 mtCO2e per year for that population. Python/Kiva is around .00087 mtCO2e per ... Aug 9, 2021 · RedMonk uses a blend of data from GitHub and Stack Overflow to come up with its semi-annual language rankings. The top 10 languages in RedMonk's latest rankings are: JavaScript. Python. Java. PHP ... Feb 1. This is a blog post-version of the recent live talk of João Saraiva in the clean-IT openXchange series. In his live talk, Saraiva explained the methods and results of their famous study ...described in Section 2.2) to analyze the energy efficiency of 27 languages and (almost) 270 programs. We have also extended it in order to monitor memory consumption, as well. This paper is organized as follows: Section 2 exposes the detailed steps of our methodology to measure and compare energy efficiency in software languages, followed by a pre-The OECD DAC Network on Development Evaluation (EvalNet) has defined six evaluation criteria – relevance, coherence, effectiveness, efficiency, impact and sustainability – and two principles for their use. These criteria provide a normative framework used to determine the merit or worth of an intervention (policy, strategy, programme ... This paper compares a large set of programming languages regarding their e ciency, including from an energetic point-of-view. Indeed, we seek to estab-lish and analyze di erent rankings for programming languages based on their energy e ciency. The goal of being able to rank programming languages based Such tables illustrate that languages like C, Rust, C++, Pascal, and others are the most eco-friendly and consume the least energy. However, little is shown about how these rankings were produced.1.4.2 Programming Method(ologie)s: Advances in methods of programming also have influenced language design, of course. Refinements in thinking about flow of control led to better language constructs for selection (i.e., if statements) and loops that force the programmer to be disciplined in the use of jumps/branching (by hiding them).Aug 24, 2021 · Python dominates as the de facto platform for new technologies. Stephen Cass. 24 Aug 2021. 3 min read. Shutterstock. Learn Python. That's the biggest takeaway we can give you from its continued ... Aug 16, 2022 · Broad adoption of Rust could reduce energy consumption of compute demands by a conservatively estimated 50%, Amazon wrote. Rust delivers the energy efficiency of the C programming language ... Feb 1, 2023 · Feb 1. This is a blog post-version of the recent live talk of João Saraiva in the clean-IT openXchange series. In his live talk, Saraiva explained the methods and results of their famous study ... Home Energy Assessments. A home energy assessment, also known as a home energy audit, can help you understand the whole picture of your home's energy use, comfort, and safety. An assessment can help you determine how much energy your home uses, where your home is inefficient, and which problem areas and fixes you should prioritize to save ... Jun 1, 2015 · Monitor and estimation tool enabled for 2nd Generation Intel® Core™ processors. IPPET is a prototype power monitoring utility that uses Intel-specific energy MSRs to break down power consumption per process and displays them in real-time on a web browser. PowerTOP is a Linux* tool to diagnose issues with power consumption and power management. Using the calculations from the previous article, we can estimate the yearly carbon impact: C#/WPF is around .00031 mtCO2e per year for that population. Python/Kiva is around .00087 mtCO2e per ...Swift. Haskell. C#. Go. Dart. JavaScript. TypeScript. “This paper presents a study of the runtime, memory usage, and energy consumption of twenty-seven well-known software languages. We monitor ...7.1 By 2030, ensure universal access to affordable, reliable and modern energy services. 7.2 By 2030, increase substantially the share of renewable energy in the global energy mix 7.3 By 2030 ...Feb 21, 2023 · Because 8-bit floating-point operations are about 30 times as energy efficient as 64-bit ones, makers of GPUs and other AI accelerator chips have been seeking ways to use such lower-precision ... Feb 1, 2023 · Feb 1. This is a blog post-version of the recent live talk of João Saraiva in the clean-IT openXchange series. In his live talk, Saraiva explained the methods and results of their famous study ... Dec 22, 2022 · This table is an extract from a 2017 scientific article, Energy Efficiency Across Programming Languages, and it makes sense: compiled languages like C or C++ are fast and energy efficient while ... Ranking. In this ranking, we can see the “greenest” and most efficient languages are: C, C+, Rust, and Java, although this last one shoots the memory usage. From the Paper: Normalized global ...https://lnkd.in/d8V5DuX4. Ranking programming languages by energy efficiency sciencedirect.comWhat's the Most Efficient Language? It's 2025, and alien explorers from a distant planet are set to make first contact with Earth. Conveniently for us, they have a universal translator. Unfortunately, for us, they've intercepted far too many episodes of Jersey Shore and have a skewed perception of our species. So, in an effort to put humanity's ...Python is a relatively new programming language, first introduced in 1989, that has surged in popularity with the emergence of new fields of application. It is an interpreted language that supports automatic memory management and object-oriented programming. It heavily prioritizes developer experience.Dec 13, 2022 · Java usage is widespread, with companies such as Google, Netflix, Uber, and Spotify using the language. Growing in popularity at a rate of 155%, Java is likely to retain its number one position for the foreseeable future. #2. Python. What this language is used for: Web development. Because 8-bit floating-point operations are about 30 times as energy efficient as 64-bit ones, makers of GPUs and other AI accelerator chips have been seeking ways to use such lower-precision ...Energy efficiency across programming languages: how do energy, time, and memory relate? Authors: Rui Pereira , Marco Couto , Francisco Ribeiro , Rui Rua , Jácome Cunha , João Paulo Fernandes , João Saraiva Authors Info & ClaimsDeveloped at Google in 2007, Go is a top-tier programming language. What makes Go really shine is its efficiency; it is capable of executing several processes concurrently. And as far as programming languages go, it has an extensive “vocabulary,” meaning it can display more information than other languages.May 1, 2021 · Request PDF | Ranking programming languages by energy efficiency | This paper compares a large set of programming languages regarding their efficiency, including from an energetic point-of-view. 1.4.2 Programming Method(ologie)s: Advances in methods of programming also have influenced language design, of course. Refinements in thinking about flow of control led to better language constructs for selection (i.e., if statements) and loops that force the programmer to be disciplined in the use of jumps/branching (by hiding them).Dec 3, 2020 · For the last five years, Rust was voted as the most loved programming language by 86% of developers who took the survey. TypeScript took position two with 67.1% while Python came third after ... Java usage is widespread, with companies such as Google, Netflix, Uber, and Spotify using the language. Growing in popularity at a rate of 155%, Java is likely to retain its number one position for the foreseeable future. #2. Python. What this language is used for: Web development.Dec 22, 2022 · This table is an extract from a 2017 scientific article, Energy Efficiency Across Programming Languages, and it makes sense: compiled languages like C or C++ are fast and energy efficient while ... The interest towards efficiency as a universal principle has only recently re-emerged due to the development of large, richly annotated corpora, which allow new forms of quantitative cross-linguistic investigation. An important role is also played by cutting-edge statistical methods, which include correlation analysis, regression, and computer ...This paper compares a large set of programming languages regarding their efficiency, including from an energetic point-of-view. Indeed, we seek to establish and analyze different rankings for programming languages based on their energy efficiency. The lambda calculus, developed in the 1930s by Alonzo Church, is a formal system of computation built from function application. In 1937 Alan Turing proved that the lambda calculus and Turing machines are equivalent models of computation, [36] showing that the lambda calculus is Turing complete. Lambda calculus forms the basis of all functional ... 1.4.2 Programming Method(ologie)s: Advances in methods of programming also have influenced language design, of course. Refinements in thinking about flow of control led to better language constructs for selection (i.e., if statements) and loops that force the programmer to be disciplined in the use of jumps/branching (by hiding them). May 1, 2021 · Ranking programming languages by energy efficiency - ScienceDirect Science of Computer Programming Volume 205, 1 May 2021, 102609 Ranking programming languages by energy efficiency Pereira a b , Marco Couto c b , Francisco Ribeiro c b , Rua c b , Jácome Cunha c b , João Paulo Fernandes d , João Saraiva c b Add to Mendeley Such tables illustrate that languages like C, Rust, C++, Pascal, and others are the most eco-friendly and consume the least energy. However, little is shown about how these rankings were produced. Welcome to IEEE Spectrum ’s ninth annual ranking of the Top Programming Languages! This year we’ve revamped and streamlined our interactive ranking tool and made other changes under the hood, but the goal remains the same—to combine multiple metrics from different sources to estimate the relative popularity of different languages.Most popular programming languages to learn in 2023. The following list outlines a few of the most popular programming languages among software developers worldwide [ 2 ]. 1. JavaScript. According to a study by Statista, JavaScript is the most popular language to learn. JavaScript (JS) is a scripting language used to make websites and mobile ...RedMonk uses a blend of data from GitHub and Stack Overflow to come up with its semi-annual language rankings. The top 10 languages in RedMonk's latest rankings are: JavaScript. Python. Java. PHP ...Energy efficiency activities between 2010 and 2012 resulted in enough energy savings to power nearly 800,000 homes for a year and cut carbon dioxide emissions by 5.3 million tons, the equivalent of removing more than 1 million cars from California’s roads. The CPUC regulates ratepayer-funded energy efficiency programs.Motivation: Even though many studies examine the energy efficiency of hardware and embedded systems, those that investigate the energy consumption of software applications are still limited, and mostly focused on mobile applications. As modern applications become even more complex and heterogeneous a need arises for methods that can accurately assess their energy consumption. Goal: Measure the ...What the study did is implement 10 benchmark problems in 27 different programming languages and measure execution time, energy consumption, and peak memory use. C and Rust significantly outperformed other languages in energy efficiency. In fact, they were roughly 50% more efficient than Java and 98% more efficient than Python.Jun 3, 2018 · Motivation: Even though many studies examine the energy efficiency of hardware and embedded systems, those that investigate the energy consumption of software applications are still limited, and mostly focused on mobile applications. As modern applications become even more complex and heterogeneous a need arises for methods that can accurately assess their energy consumption. Goal: Measure the ... Here are the metrics we use to build an overall ranking of programming language popularity. The IEEE Spectrum Top Programming Languages app synthesizes 11 metrics from eight sources to arrive at ...👉 Ranking #programmingLanguages by #energy #efficiency 🤔 Impressive work !👏 ⬇️⬇️⬇️ Rui Pereira, et all, Ranking programming languages by energy efficiency, Science of Computer ...
Dec 22, 2022 · This table is an extract from a 2017 scientific article, Energy Efficiency Across Programming Languages, and it makes sense: compiled languages like C or C++ are fast and energy efficient while ... . Kirchner
Algorithmic efficiency. In computer science, algorithmic efficiency is a property of an algorithm which relates to the amount of computational resources used by the algorithm. An algorithm must be analyzed to determine its resource usage, and the efficiency of an algorithm can be measured based on the usage of different resources. In a programming language, an evaluation strategy is a set of rules for evaluating expressions. The term is often used to refer to the more specific notion of a parameter-passing strategy that defines the kind of value that is passed to the function for each parameter (the binding strategy) and whether to evaluate the parameters of a function call, and if so in what order (the evaluation order).But Python alone does not make a career. In our “Jobs” ranking, it is SQL that shines at No. 1. Ironically though, you’re very unlikely to get a job as a pure SQL programmer.Ranking programming languages by energy efficiency R Pereira, M Couto, F Ribeiro, R Rua, J Cunha, JP Fernandes, J Saraiva Science of Computer Programming, 102609 , 2021Investment in efficiency is projected to fall 9% in 2020. Travel restrictions and lockdowns are having major impacts on long-distance and urban transport. Transport sector energy consumption is projected to fall by 10% in 2020 compared with 2019, including an 11% drop in oil consumption of around 6 million barrels a day. 1. JavaScript. JavaScript is one of the world’s most popular programming languages on the web. Using JavaScript, you can build some of the most interactive websites. Also, it is one of the most demanding languages in programming as per recent reports by Stack Overflow.Aug 24, 2021 · Python dominates as the de facto platform for new technologies. Stephen Cass. 24 Aug 2021. 3 min read. Shutterstock. Learn Python. That's the biggest takeaway we can give you from its continued ... Nov 2, 2022 · The idea transmuted over to software programming languages—surely a faster language was a greener one, the logic went. That all changed in 2017 thanks to a group of researchers in Portugal who use what’s called the Computer Language Benchmarks Game (CLBG) as a way of ranking software languages in terms of energy efficiency. ENERGY STAR is the simple choice for energy efficiency, making it easy to find products that will save you money and protect the environment. The US Environmental Protection Agency (EPA) ensures that each product that earns the label is independently certified to deliver the efficiency performance and savings that consumers have come to expect ...1.4.2 Programming Method(ologie)s: Advances in methods of programming also have influenced language design, of course. Refinements in thinking about flow of control led to better language constructs for selection (i.e., if statements) and loops that force the programmer to be disciplined in the use of jumps/branching (by hiding them).(In any given ranking, the highest-ranked language is assigned a score of 100, and the scores of lower-ranked languages are scaled to that.) The number-crunching language R rounds out the top five.Our default ranking is weighted toward the interests of an IEEE member, and looking at the top entries, we see that Python has held onto its comfortable lead, with Java and C once again coming in ...Jul 4, 2021 · Using the calculations from the previous article, we can estimate the yearly carbon impact: C#/WPF is around .00031 mtCO2e per year for that population. Python/Kiva is around .00087 mtCO2e per ... Java usage is widespread, with companies such as Google, Netflix, Uber, and Spotify using the language. Growing in popularity at a rate of 155%, Java is likely to retain its number one position for the foreseeable future. #2. Python. What this language is used for: Web development.Motivation: Even though many studies examine the energy efficiency of hardware and embedded systems, those that investigate the energy consumption of software applications are still limited, and mostly focused on mobile applications. As modern applications become even more complex and heterogeneous a need arises for methods that can accurately assess their energy consumption. Goal: Measure the ...Energy efficiency is the use of less energy to perform the same task or produce the same result. Energy-efficient homes and buildings use less energy to heat, cool, and run appliances and electronics, and energy-efficient manufacturing facilities use less energy to produce goods. Energy efficiency is one of the easiest and most cost-effective ...Jun 1, 2015 · Monitor and estimation tool enabled for 2nd Generation Intel® Core™ processors. IPPET is a prototype power monitoring utility that uses Intel-specific energy MSRs to break down power consumption per process and displays them in real-time on a web browser. PowerTOP is a Linux* tool to diagnose issues with power consumption and power management. v. t. e. Computer programming is the process of performing particular computations (or more generally, accomplishing specific computing results), usually by designing and building executable computer programs. Programming involves tasks such as analysis, generating algorithms, profiling algorithms' accuracy and resource consumption, and the ... Dec 22, 2022 · This table is an extract from a 2017 scientific article, Energy Efficiency Across Programming Languages, and it makes sense: compiled languages like C or C++ are fast and energy efficient while ... Haskell (/ ˈ h æ s k əl /) is a general-purpose, statically-typed, purely functional programming language with type inference and lazy evaluation. [26] [27] Designed for teaching, research, and industrial applications, Haskell has pioneered a number of programming language features such as type classes , which enable type-safe operator ... .