Core

Core is Jane Street's industrial-strength alternative to the OCaml standard library.

Core provides an overlay on the usual namespace, so the best way to use Core is to start your file with:

open Core

The full API is browsable here.

Relationship to Core_kernel

Core extends Core_kernel, which exists for cases when Core in its entirety can't be used, like in Javascript.

In sum:

• Base: Minimal stdlib replacement. Portable and lightweight and intended to be highly stable.
• Core_kernel: Extension of Base. More fully featured, with more code and dependencies, and APIs that evolve more quickly. Portable, and works on Javascript.
• Core: Core_kernel extended with UNIX APIs.