Async

2 articles

Rust 03 Sep 2026 9 min read

Understand Pin and Unpin in Rust

Most Rust values can move freely. Assign a value to another variable, pass it by value, return it from a function, or replace it inside a container, and the value may end up at a different memory address. Usually that is exactly what you want. Rust’s ownership model tracks who owns a value, not where that value must remain in memory. A smaller class of types is different. Some values become address-sensitive: code relies on the value continuing to exist at the same memory location. Compiler-generated futures and carefully designed self-referential structures are common examples.

Rust Ownership

JavaScript 01 Sep 2026 5 min read

Choosing JavaScript Promise Combinators: all, allSettled, any, and race

JavaScript provides several Promise combinators that look similar but encode very different failure policies. Choosing between Promise.all, Promise.allSettled, Promise.any, and Promise.race is less about syntax and more about defining what “success” means for a group of asynchronous operations. The important question is not “which one runs in parallel?” Promises usually start when you create them. The combinator decides how to observe their outcomes. Promise.all: every result is required Use Promise.all when the operation is successful only if every input fulfills.

JavaScript Promises