science

JSFiddle

JSFiddle is a 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 JSFiddle rather than just read about it. In short: JSFiddle is an online IDE service and online community for testing and showcasing user-created and collaborational HTML, CSS and JavaScript code snippets, known as 'fiddles'. It allows for simulated AJAX calls.

JSFiddle — illustration

Key takeaways

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

Reference excerpt

JSFiddle is an online IDE service and online community for testing and showcasing user-created and collaborational HTML, CSS and JavaScript code snippets, known as 'fiddles'. It allows for simulated AJAX calls. In 2019, JSFiddle was ranked the second most popular online IDE by the PopularitY of Programming Language (PYPL) index based on the number of times it was searched, directly behind Cloud9 IDE, worldwide and in the USA.

Concept JSFiddle is an online IDE which is designed to allow users to edit and run HTML, JavaScript, and CSS code on a single page. Its interface is minimalist and split into four main frames, which correspond to editable HTML, JavaScript and CSS fields and a result field which displays the user's project after it is run. Since early on, JSFiddle adopted smart source-code editor with programming features. As of 2020, JSFiddle uses CodeMirror to support its editable fields, providing multicursors, syntax highlighting, syntax verification (linter), brace matching, auto indentation, autocompletion, code/text folding, Search and Replace to assist web developers in their actions. On the left, a sidebar allows users to integrate external resources such as external CSS stylesheets and external JavaScript libraries. The most popular JavaScript frameworks and CSS frameworks are suggested to users and available via a click. JSFiddle allows users to publicly save their code an uncapped number of times for three. Each version is saved online at the application's website with an incremental numbered suffix. This allows users to re-access their saved code. Code saved on JSFiddle may also be edited into new versions, shared with other parties, and forked into a new line. JSFiddle is widely used among web developers to share simple tests and demonstrations. JSFiddle is also widely used on Stack Overflow, the dominant question-answer online forum for the web industry.

History In 2009, JSFiddle's predecessor, MooShell, was created by Piotr Zalewa as a website application which was exclusive to the MooTools community. In 2010, Oskar Krawczyk joined the project as a developer, and the platform was made freely available under the name of JSFiddle. In 2016, JSFiddle underwent a full platform overhaul and became ad-sponsored. In 2017, Michał Laskowski and Andrzej Kała joined the company.

References

External links https://jsfiddle.net

Illustrations

Worked examples

Example 1 — a first encounter with JSFiddle

Start with the simplest possible case. Write down what JSFiddle claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In 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 JSFiddle 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 JSFiddle 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 JSFiddle

In research: JSFiddle appears in 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 JSFiddle 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: JSFiddle is common in secondary-school and first-year university syllabi. It links to neighbouring topics Online integrated development environments, Technology websites, so understanding it makes those chapters shorter.
In everyday life: Look for JSFiddle 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 JSFiddle in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what JSFiddle 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 JSFiddle out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is JSFiddle in simple terms?

Why does JSFiddle matter?

Because it connects several 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 JSFiddle?

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 JSFiddle.