This section is for looking up exact names and behavior once the getting-started guide and language basics are familiar.
| Reference | Use it for |
|---|---|
| Syntax | Definitions, functions, expressions, control flow and collections |
| Tokens and operators | Literal forms, operators, delimiters and keywords |
| Types | Language values and runtime objects |
| Built-in functions | Function arguments, results and implementation limits |
| CLI | Running source, compile paths, project commands and web commands |
| System APIs | Files, processes, environment, sockets, HTTP and databases |
The runtime has an interpreter, a bytecode VM and an experimental ELF output path. They do not implement identical language or built-in coverage. The exact baseline for this reference is listed on the O Language overview.
For programming tasks, use Web programming and database access. Those guides explain common workflows; this index points to the corresponding API detail.