Jake Wharton

Blog posts, presentations, GitHub, and more.

Popular posts: 2
Total points: 248
HN comments: 139
Rank: #10,628 personal

Visit jakewharton.com → On Hacker News Apr 2020 – Aug 2020

Systems & Performance 2 Software Engineering 2

Most points Most discussed Most cited Newest

Which is better on Android: divide by 2 or shift by 1?

2020148 points110 comments Systems & Performance details

I've been porting the AndroidX collection library to Kotlin multiplatform to experiment with binary compatibility, performance, tooling, and the different memory models. Some of the data structures in the library use array-based binary trees to store elements. The Java code has a lot of shifts to replace power-of-two…

Shrinking a Kotlin Binary by 99.2%

2020100 points29 comments Systems & Performance details

We'll get to the shrinking, but first let's motivate the binary in question. Three years ago I wrote the "Surfacing Hidden Change to Pull Requests" post which covered pushing important stats and diffs into PRs as a comment. This avoids surprises with changes that affect binary size, manifests, and dependency trees.