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JavaScript

Practical tutorials for the work we actually do. Pick one, read it in order, and apply it.

Any category Programming38 JavaScript 3 TypeScript 3 HTML and CSS 32
Any topics APIs and Integrations 5 Automation and Scripting 1 Data Structures and Algorithms 2 Object-Oriented Programming 3 Packaging and Dependencies 4 Performance Optimization 6 Programming Basics 10 Programming Patterns 5 Testing and Debugging 10 Type Systems 1 Web Development 3
Any level Beginner 1 Advanced 2
JavaScript Web Development Clear filters 3 results
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Make a Button Do Something With addEventListener

Find the button, attach a listener, change something on the page when it's clicked. Three steps, and two mistakes that make it silently do nothing.

5 min read
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Find a Retained Detached DOM Node With Heap Snapshots

Trace a detached preview from its DOM node to an application Map, repair cleanup, and verify repeated open-and-close cycles with heap snapshots.

6 min read
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Find the Slow Function With Chrome's Performance Profiler

Record one slow click in Chrome's Performance panel, read the Bottom-up tab by self time, fix the function it points at, and record again to prove the fix worked.

6 min read