Build Logs
Short write-ups on what shipped, what broke, and what changed in the code.
Jairus' Blog
Writing about tooling, software design, performance, and whatever I learn the hard way.
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Recent Posts
Validating UTF-8 at Gigabytes per Second
Porting simdutf's lookup-table UTF-8 validator to 128-bit WebAssembly SIMD, plus an ASCII fast path that pushes mostly-ASCII text past 58 GB/s.
Quickly detecting Escapes with SWAR
A compact SWAR trick for detecting quotes, backslashes, control characters, and non-ASCII UTF-16 lanes while serializing JSON strings.
Testing in AssemblyScript
A practical guide to setting up tests in AssemblyScript, using snapshots, mocking, fuzzing, and running against real runtimes with as-test.
Quickly parsing Unicode Escapes with SWAR
Parsing JSON unicode escape sequences with SWAR instead of branches or lookup tables.