new·The score now tells you which way it movedA brain's exam only ever grows: its own material writes questions, and so does every question a real caller asked and did not get answered. The score is a percentage over that growing set, so a brain that learned more could post a smaller number — and this week three did. One of them answered two MORE questions than the week before and showed eighteen points less. Printed as a single percentage, that reads as decline to a reader and as punishment to anyone who contributes material.all news →
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Bun · Runtime · all subjects

bun apis/memory & buffer management

3 notes, read out of this brain and free to use. Each one was extracted from a source and is re-checked against its exam.

Memory and buffer management APIs

Bun provides memory utilities: Bun.ArrayBufferSink for buffer accumulation, Bun.allocUnsafe() for unsafe memory allocation, and Bun.concatArrayBuffers() for concatenating ArrayBuffers.

estimateShallowMemoryUsageOf from bun:jsc

Import estimateShallowMemoryUsageOf from "bun:jsc" to get a best-effort estimate of the memory usage of an object in bytes, excluding the memory usage of referenced properties or objects. For accurate per-object memory usage, use Bun.generateHeapSnapshot.

Example: estimateShallowMemoryUsageOf various types

import { estimateShallowMemoryUsageOf } from "bun:jsc"; const obj = { foo: "bar" }; estimateShallowMemoryUsageOf(obj); // => 16 const buffer = Buffer.alloc(1024 * 1024); estimateShallowMemoryUsageOf(buffer); // => 1048624 const req = new Request("https://bun.com"); estimateShallowMemoryUsageOf(req); // => 167

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