computer science

Stylus (style sheet language)

Stylus (style sheet language) is a computer science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Stylus (style sheet language) rather than just read about it. In short: Stylus is a dynamic stylesheet preprocessor language that is compiled into Cascading Style Sheets (CSS). Its design is influenced by Sass and Less.

Key takeaways

Stylus (style sheet language) belongs to computer science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Stylus (style sheet language) to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Stylus (style sheet language) from memory before moving on to harder problems.

Reference excerpt

Stylus is a dynamic stylesheet preprocessor language that is compiled into Cascading Style Sheets (CSS). Its design is influenced by Sass and Less. As of 2012, it was regarded as the fourth most used CSS preprocessor syntax. It was created by TJ Holowaychuk, a former programmer for Node.js and the creator of the Luna language. It is written in JADE and Node.js.

Selectors Unlike CSS, which uses braces to open and close declaration blocks, indentation can be used. Additionally, semi-colons (;) are optionally omitted. Hence, the following CSS:

can be shortened to:

Further, colons (:) and commas (,) are also optional; that means the above can be written as,

Variables Stylus allows variables to be defined, however unlike Less and Sass, it doesn't use a symbol to define variables. Additionally, variable assignment is done automatically by separating the property and keyword(s). In this way, variables are similar to the variables in Python.

The Stylus compiler would translate the above document to:

Mixins and functions Both mixins and functions are defined in the same manner, but they are applied in different ways. For example, if you wanted to define the CSS border radius property without having to use various Vendor Prefixes you can create:

then, to include this as a mixin, you would reference it as:

this would compile to:

Interpolation To include variables in arguments and identifiers, brace characters surround the variable(s). For example, evaluates to

References

External links Official website Stylus source code repository (Git) Source code comparison with Sass/SCSS and Less Online Stylus compiler

Illustrations

Worked examples

Example 1 — a first encounter with Stylus (style sheet language)

Start with the simplest possible case. Write down what Stylus (style sheet language) claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Stylus (style sheet language) before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Stylus (style sheet language) ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Stylus (style sheet language)

In research: Stylus (style sheet language) appears in computer science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Stylus (style sheet language) in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Stylus (style sheet language) is common in secondary-school and first-year university syllabi. It links to neighbouring topics Computer-related introductions in 2010, Free computer libraries, Programming language topic stubs, so understanding it makes those chapters shorter.
In everyday life: Look for Stylus (style sheet language) outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Stylus (style sheet language) in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Stylus (style sheet language) means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Stylus (style sheet language) out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Stylus (style sheet language) in simple terms?

Stylus is a dynamic stylesheet preprocessor language that is compiled into Cascading Style Sheets (CSS). Its design is influenced by Sass and Less.

Why does Stylus (style sheet language) matter?

Because it connects several computer science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Stylus (style sheet language)?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Stylus (style sheet language).