Designing and evaluating usable APIs: Stories from Jetpack Compose World
summary
Jetpack Compose sets concrete usability goals — faster learnability and gradual mastery — and evaluates them with mixed methods: cognitive Dimensions as a shared vocabulary, think‑aloud coding sessions, week‑long “homework” diary studies, and lightweight code‑review walkthroughs. The team removed primitive overloads for Button, adopted a slot API (single composable Lambda) to avoid a customization cliff, and iterated Modifiers from a confusing plus operator to chained Kotlin extension functions where ordering explicitly matters. Results show simpler component surfaces and fewer surprising migration costs for developers.
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chapters (17)
- 0:00Introduction
- 1:04Overview
- 1:28What is boilerplate
- 2:41Overview of the talk
- 3:12The spectrum of users
- 4:12The developer experience
- 6:05The Cognitive Dimensions Framework
- 7:22The ubiquitous button
- 8:44Programming exercises
- 11:47Slot API
- 12:59Lowcost approaches
- 14:19Summary
- 14:47Life story of modifiers API
- 21:17Understanding developers reaction to modifiers
- 25:34What did we change
- 27:37Questions
- 30:19Methods
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