What does "variable" mean? Explained in simple terms / ITech content

Contents:

• What is variability?
• How a variable font works
• History of the format
• How variable fonts are used
• Variability in development is even better
• Variability in web development
• Data type variability
• So what's the bottom line?

The term "variable" is used in both design and information technology (IT), but its meaning can differ depending on the context. In design, "variable" often refers to the ability of elements to adapt to different conditions, providing flexibility in visual presentation. This can include changes in color, shape, or structure depending on user preferences or the environment in which they are used.

In IT, "variable" is more often associated with programming and algorithms, where it refers to the possibility of choosing between multiple solutions to problems, as well as the ability of systems to process different inputs and produce a variety of results. Thus, while the basic idea of ​​variability remains, it takes on specific nuances in each field.

Type design experts Rodion Ilyukhin and developer Zufar Sunagatov explain the concept of "variable" simply and clearly. Variable fonts represent an innovative approach to typography that allows you to create multiple styles of a single font in a single file. This simplifies the process of working with text and makes it more flexible and adaptable to various design solutions. Variable fonts provide smooth changes in thickness, width, and other characteristics, allowing designers and developers to find optimal solutions for their projects.

Interface designer by day, type designer in the evenings and on weekends. I am convinced that the font is the main component of the project identity. Choosing the right font not only enhances visual perception but also helps create a unique style that makes a project memorable.

What is variability?

Variability is an object's ability to change and adapt. In design, this principle manifests itself not only in fonts but also in identity, which is most often described as dynamic. Dynamic identity allows brands to change visual elements depending on the context, making them more flexible and appealing to the audience. Thus, variability is becoming a key aspect of modern design, ensuring the uniqueness and relevance of visual communication.

A variable font is a font file that includes multiple styles. It has several advantages over static fonts. Firstly, variable fonts allow you to use different styles and weights in a single file, which simplifies the management of font resources on the site. Secondly, they help reduce the overall size of downloaded files, which positively affects the speed of page loading. In addition, variable fonts provide greater flexibility in design, allowing you to easily adapt the text to different visual styles and requirements. Using variable fonts can improve user experience and increase the appeal of web content.

• it allows the user to get any intermediate result between these styles;
• it is much lighter than a font family of several static styles;
• it allows interactivity on the web. The appearance of the text can be linked to anything - hover, wind speed outside, the level of ice melting in the Arctic.

How a variable font works

To make a font variable, you need two different styles, called masters. Interpolation occurs between these masters, allowing you to create a variety of font styles. Variable fonts give designers more options for customizing and adapting text to different visual requirements, improving the readability and aesthetics of the design.

For correct interpolation, both paths must have the same number of anchor points and handles. This condition ensures accuracy and consistency in the interpolation process, which is critical to achieving the desired result. Proper correspondence between the contours ensures that the created form will be smooth and without distortion.

Interpolation, derived from the Latin word «interpolis», refers to the process of finding unknown values ​​between given data. This term is widely used in various fields, including animation. If you've ever worked with animation, you've probably encountered the concept of keypoints or keyframes. These keypoints serve as major moments in the animation, and interpolation occurs between them to smoothly transition from one state to another. Thus, interpolation plays an important role in creating realistic and dynamic animation sequences, ensuring visual coherence and continuity of movement.

History of the format

Variable fonts, although relatively recently popular, have their roots in a concept proposed by Adobe in 1991 called Multiple Master. However, this idea was not widely adopted due to its complexity. Users had to set up the desired font in a special program, Adobe Type Manager, and then upload a static file for installation on the system. Modern variable fonts have greatly simplified this process, allowing the use of multiple font styles in a single file, making them more convenient and effective for web design and graphic design.

In 1997, Adobe and Microsoft introduced the format OpenType, which significantly expanded font capabilities. The number of available characters increased from 256 to 65,000, allowing for the storage of numerous alternate glyphs in a single file. The format supports old-style figures, small caps, fractions, swashes, superscript and subscript characters, capital letters, as well as contextual and stylistic alternates. This makes OpenType an indispensable tool for designers and typographers, offering a full range of ligatures and ensuring high-quality printing and display of text.

In 2016, a new version of the font format, OpenType Font Variables, was presented at the AtypI font conference. This format is an evolution of the Multiple Master concept, but is now integrated directly into editors and browsers, allowing users to select typefaces without having to generate them first. In 2021, OpenType Font Variables added support for color fonts, significantly expanding typography and design possibilities.

The AVAR2 specification was recently released, which includes a number of key features. These innovations significantly expand the technology's usability and improve its efficiency. Importantly, AVAR2 offers improvements that can be applied across a wide range of applications, delivering increased performance and stability. These changes are expected to have a positive impact on the development and implementation of this technology in the future.

• Limiting the design space of the font to exclude interpolation results not intended by the font designer.

• Reducing the number of masters makes it easier to create advanced families with many styles.
• Critical reduction in font sizes (about 80%).
• Nonlinear interpolation.

How variable fonts are used

• Variable Fonts - a catalog of all existing variable fonts.
• TypeTrials — a tool for testing variable fonts.
• vartype beta — a sandbox for testing and animation.

The lead backend developer of the Lloyd’s of London project is responsible for the development and support of the server part of the application, ensuring its stability and performance. A key task is integrating complex business logic and interacting with databases. This specialist works in a team, collaborating closely with front-end developers and other project participants to achieve high quality standards. Experience with modern technologies and programming languages, such as Java, Python, and Node.js, allows for effective problem-solving and innovation in the project. As a result, the Lloyd's of London app becomes more reliable and user-friendly.

The author of a Telegram channel for IT specialists, conducts mentoring sessions on the ADPList platform for everyone, and also writes articles on topics related to information technology.

Variability is an important aspect that enriches our lives. It provides the opportunity to choose from a variety of options, which contributes to a deeper understanding and assimilation of information. In various fields, such as art, science, and everyday life, variability opens new horizons and inspires creativity. By exploring different approaches and solutions, we can find optimal strategies for achieving goals, improve our quality of life, and develop our abilities. Variability not only broadens our horizons but also fosters critical thinking, allowing us to analyze and evaluate alternatives. This makes variability an important factor in decision-making and personal growth. Variability refers to the presence of multiple options that can manifest in behavior or lead to different results when performing specific actions. This concept is widely used in fields such as psychology, economics, and artificial intelligence, emphasizing the diversity of approaches and possible outcomes in given situations. Understanding variability is important for analysis and forecasting, as it allows you to take into account many factors and scenarios that affect the final result.

Variability in development is even better

Variability in development can Cover many aspects. These can include different product versions, alternative designs, functional modules, and even user interaction methods. Each of these elements plays a vital role in creating a unique and adaptable product. A variative approach allows developers to address the needs of different target audiences, which in turn contributes to increased competitiveness and user satisfaction. Optimizing development processes and implementing variative solutions will help achieve better results and effectively solve project problems.

A number of programming languages ​​offer the concept of variadic arguments. This feature makes code more flexible and easier to use. With variadic arguments, developers can call methods with a variable number of arguments without having to create an array. This simplifies the code structure and improves its readability, streamlining the development process. The use of variadic arguments also improves data handling in functions, making them more versatile and adaptable to various application scenarios.

In the Python programming language, the asterisk (*) symbol can be used to denote variadic arguments to a function. This allows you to pass an arbitrary number of arguments to a function. In Java and C#, the ellipsis operator (…) has similar functionality, also allowing you to accept a variable number of arguments. Using these methods simplifies working with functions and makes your code more flexible and convenient.

Let's imagine a situation: you're at a restaurant with friends, and you have a tradition according to which once a month someone from your company pays the entire bill. However, the question arises: how to fairly determine who will pay this time. Drawing straws? This is an outdated method!

Modern solutions offer more interesting and fair ways to select the payer. For example, you can use random number generators or special applications for distributing the bill. These methods not only simplify the process, but also make it more fun.

The use of technology helps avoid conflicts and misunderstandings, which makes your meeting with friends more enjoyable. Choosing a payer becomes more than just a routine task; it's part of your friendly tradition, adding an element of surprise and fun.

We'll develop a Python function, chooseLuckyOne(*names*), that accepts an arbitrary number of meeting attendee names and returns one random name, which will be the lucky person who pays the entire bill. This function will be useful for choosing the person who will take on the financial obligations during a gathering. Using the capabilities of the Python language, we will ensure simplicity and ease of use of this function, which will make it a great tool for entertainment in the company of friends.

Last month you met in three.

This month, your team has grown to four people.

Olya fell out both times.

Sorry, Ol, this is just an example.

Got it? Great!

Let's look at a more complex example of variability.

Variability in Web Development

When developing a website, it's important to ensure its compatibility with different web browsers, such as Safari, Google Chrome, Mozilla Firefox, and Internet Explorer. Each of these browsers has its own unique characteristics, which can lead to differences in the display of web page elements. To avoid such problems, it is necessary to use cross-browser testing and modern technologies such as HTML5 and CSS3. This will allow you to create a responsive and functional website that will display correctly on all platforms. Ensuring a consistent user experience across devices and browsers is key to the success of your web project.

To ensure that website elements display correctly in all popular browsers, you must use CSS styles that are compatible with each of them. This will ensure a consistent appearance across web pages across platforms. Using cross-browser styles will not only improve the user experience but also enhance the overall accessibility of your site.

You can use JavaScript polyfills—code snippets that provide support for modern features and capabilities in legacy browsers that don't natively support them. Using polyfills allows you to create a responsive and functional website that will work correctly across different browsers and devices. This solution will help you expand your audience and improve user experience, making your content accessible to more users.

Rework the text without detracting from the main topic. Make sure it is optimized for search engines. Supplement the content without adding unnecessary information. Avoid using emojis and unnecessary characters. Do not add structured sections such as numbers or symbols. Provide clean text.

Read also:

Responsive design is an approach to web development that allows websites to display correctly on different devices and screens. It ensures a user-friendly experience, regardless of whether they are using a smartphone, tablet, or computer. Responsive websites automatically adjust to screen sizes, changing the arrangement of elements, font sizes, and images. This improves interaction with the content and increases its accessibility. Responsive design not only improves user experience but also has a positive effect on SEO, since search engines prefer websites optimized for mobile devices. Ultimately, a responsive approach helps attract and retain more visitors, making it an important aspect of modern web design.

Variability of Data Types

The example with browsers turned out to be quite clear and easy to understand. It demonstrates the basic principles of web technologies and allows for a better understanding of how users interact with the Internet. This approach helps visualize complex processes, making them more accessible to a wider audience. The discussion of browsers also highlights the importance of choosing them to optimize the web experience. Choosing the right browser can significantly improve the user experience, as well as impact performance and security on the web.

Let's defeat the final boss.

In programming languages, data types can be very diverse and variable. This diversity allows programmers to solve various problems more effectively by choosing the most appropriate data types for a specific application. There are several main categories of data types, including primitive and composite. Primitive types, such as integers, floating-point numbers, characters, and Booleans, form the basis for most operations. Composite data types, such as arrays, structures, and classes, allow you to combine primitive types to create more complex structures. It is important to understand how to choose and use data types correctly to optimize program performance and improve readability. Proper use of data types also helps reduce errors and improve code reliability. Thus, data type variability in programming languages ​​is a key aspect to consider when developing software.

Variability is a key property that characterizes the relationship between complex data types in a number of programming languages. This unique feature enables the creation of flexible and adaptive programs, making them more efficient and convenient for developers. Variability improves code readability and simplifies its maintenance, which is especially important in today's rapidly evolving technology. Using variability, programmers can implement more complex logical structures and ensure high application performance.

Do you like fruit? If so, they will be a great example for understanding the concept of variability. Fruits vary in taste, color, and shape, allowing us to consider how different variations can influence our choices and preferences. It is important to understand that variety is a key aspect both in nature and in life. By examining fruits, we can better understand how variability manifests itself in our daily lives and how it influences our perception of the world around us.

Let's consider the hierarchy of types. This is an important aspect that helps structure information and makes it easier to understand. Hierarchy helps organize content, making it more readable and understandable. It includes various levels, from main headings to subheadings and the body of the text. Proper use of hierarchy helps improve SEO, as search engines take text structure into account when ranking pages. Effective use of type hierarchy also improves user experience because readers can quickly find the information they need.

Fruit is the basic data type from which Apple and Orange are derived. These two types inherit the properties and methods of the Fruit base type, allowing you to effectively organize and manage data about different fruits.

In Java code, this hierarchy would be represented as follows:

Based on this hierarchy of data types, we can There are three main types of variance: covariance, contravariance, and invariance. Covariance means that subtypes can be used in place of their superclasses, allowing for more flexible data handling. Contravariance, on the other hand, means that superclasses can be used in place of subtypes, providing additional type safety. Invariance, on the other hand, means that data types cannot be replaced by their subtypes or superclasses, making the system more strict. Understanding these concepts is key to effectively using type hierarchies in programming. Covariance is an important property of data types that allows the inheritance hierarchy of the original types to be preserved in derived types. This means that if type A is the parent of type B, then type B can be used in a context where type A is expected. Covariance plays a key role in ensuring the flexibility and reuse of code, especially in programming languages ​​that support an object-oriented approach. By using covariant types, developers can create more general and easily extensible application architectures.

If the Apple and Orange data types inherit from the Fruit data type, then covariance makes collections of the Apple and Orange types subtypes of the Fruit collection. This means that, for example, "a list of five apples or oranges" can be considered a special case of "a list of five fruits." This structure allows collections to be used more flexibly and efficiently, providing the ability to work with different subtypes of fruits in a single collection interface.

SEO-conscious text rewriting is important for increasing the visibility of your content in search engines. Optimized text should be natural, including keywords that are relevant to the topic.

It is important that the text is readable and informative to retain users' attention. To achieve this, try to use synonyms, related terms, and phrases that can be entered into the search bar.

Also, it is worth paying attention to the structure of the text. Use subheadings, short paragraphs, and lists to make information more accessible. Don't forget about meta tags and image attributes, which also play an important role in SEO. Keep your information current to ensure your content remains useful to readers. Regularly updating your text will help maintain its search engine rankings and attract new audiences.

Continuously analyze the results and make changes when necessary to stay competitive in your niche.

In this context, it is argued that a type, namely the generic Collection interface, exhibits covariance with respect to its type parameter. T. This means that the interface allows derived types to be used in contexts where a base type is expected, simplifying work with collections and increasing code flexibility. Covariance is an important concept in generic programming, as it facilitates the creation of more general-purpose and reusable components.

Covariance offers several significant advantages. First, it enables the creation of more flexible and scalable software architectures by simplifying the process of working with inheritance and polymorphism. Second, covariant types provide greater type safety, which helps avoid compiler errors and improves code reliability. Third, using covariance improves code readability and maintainability, as developers can use more abstract and general methods without losing concrete types. These advantages make covariance an important aspect in modern programming languages ​​and architectural decisions.

• Allows the use of objects of derived data types instead of objects of base data types, making it easier to work with more abstract data types.
• Allows the use of collections (lists, arrays, and so on) with elements of derived data types instead of base data types, making code more compact and understandable.
• Allows arguments of derived data types to be passed without the need for explicit type conversion for functions expecting arguments of base data types.

Contravariance is the opposite property of data types to covariance. It allows the inheritance hierarchy of base types to be inverted in derived types, provided that the derived type functions as a general type. This means that contravariant types can replace more specific types, providing greater flexibility when using generics and interfaces. Contravariance is often used in functional programming and in languages ​​that support generics, such as C# and Java, to create more versatile and adaptive systems.

If the Apple and Orange data types inherit from the Fruit data type, then contravariance allows us to add objects of the Apple and Orange types to a collection of the Fruit data type. This allows us to use a collection with a more general data type instead of a collection with a more specific type, simplifying data management and increasing code flexibility.

Sorry, you haven't provided the text that needs to be rewritten. Please paste the text, and I will help you adjust it for SEO.

Contravariance has a number of significant advantages. First, it allows you to create more flexible and universal data structures, which simplifies their modification and extension. Second, contravariant types improve type safety in programming languages ​​by providing stronger compile-time checking. This helps avoid potential errors due to incorrect type use. Contravariance also simplifies inheritance by allowing subclasses to use a wider range of types, increasing code reusability. These benefits make contravariance an important aspect in developing modern software solutions and architectures.

• Allows you to use objects of base data types instead of objects of derived data types, making it easier to work with more specific data types.
• Allows you to use collections (stacks, queues, and so on) with elements of base data types instead of derived data types, making your code more compact and understandable.
• Allows you to pass arguments of base data types without the need for explicit type conversions to functions that expect arguments of derived data types.

Invariance is a situation in which data types exhibit neither covariance nor contravariance. This means that it is impossible to enforce rules that allow one data type to be replaced by another, even if they are in a hierarchy. Invariant types require strict conformance, which makes them less flexible but provides greater type safety. Understanding invariance is important for software development, as it helps avoid errors related to type incompatibilities in code.

The Apple and Orange data types are both descendants of the Fruit data type. However, collections with the Apple and Orange data types are not subtypes of the Fruit collection. This is because in most programming languages, collections are not inherited and cannot be used as subtypes, even if they descend from a common parent type. Therefore, when working with collections and their hierarchies, it is important to take these features into account to avoid errors and properly organize the data structure.

Reworking text for SEO involves using keywords that improve visibility in search engines, as well as creating more structured and readable content. The revised text is presented below.

—

Code optimization is an important aspect of web development that affects the performance and quality of a website. Proper HTML structure helps improve page display in search engines. Using semantic tags such as <header>, <footer>, <article>, and <section> helps both users and search engines better understand the page content.

It is important to keep the code clean and avoid redundancy, which has a positive effect on the website loading time. Optimizing images and using file formats such as WebP can significantly speed up page loading. It is also worth paying attention to meta tags, which help search engines index content and users find the information they need.

In addition, adapting design for mobile devices is becoming an integral part of web development. Responsive design makes a website easy to use across different devices, which can improve its ranking in search engines. Including keywords in headings, subheadings, and text blocks improves SEO, helping to attract a more targeted audience.

Thus, careful work on the code and its optimization not only improves the performance of the site but also contributes to its successful promotion on the Internet.

Invariance offers several significant advantages. First, it ensures system stability and predictability, which is especially important in the face of changing external factors. Second, invariant properties help simplify the analysis and modeling of complex processes, allowing one to focus on key aspects. Furthermore, invariance contributes to increased system reliability by enabling the early detection and elimination of potential errors. Finally, the use of invariants can significantly reduce development and testing time by simplifying the process of verifying the correct operation of the system. Thus, invariance is an important tool in various fields, including mathematics, physics, and computer science.

• It ensures strong typing, where objects can only be used with objects of the same exact type, without allowing type conversions or substitutions with derived or base data types.
• It improves the clarity and understandability of code, as it does not allow implicit conversions and requires explicit specification of the exact data type, which can help prevent confusion and errors.

What's the Bottom Line?

Variability in software development is an important aspect that can be both complex and confusing. However, it offers programmers many opportunities to complete tasks efficiently. Proper use of variability can improve code quality and reduce the likelihood of errors. It is important to approach this tool consciously in order to maximize its benefits and avoid negative consequences.

We wish you success in exploring the world of information technology and in software development. Diving into this field opens up numerous opportunities for career advancement and personal development. Don't forget the importance of ongoing learning and practice to stay competitive in the rapidly changing world of IT.

Learn more about design and current trends in our Telegram channel. Subscribe to stay up-to-date with interesting materials and helpful tips!

Revised text:

Studying current topics and events provides a unique opportunity to expand your knowledge and deepen your understanding of the world around you. Subscribe to updates and stay up-to-date with the latest news and trends. Don't miss the chance to read useful materials that will help you stay informed and make informed decisions.

Read also:

• What does "dynamic" mean? Explained in simple terms
• Brand sounds, smells, and changing logos. Talking about dynamic identity
• What does "native" mean? Explaining in simple terms
• What is a frame in simple terms
• What is a module in simple terms