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For the complete Mojo documentation index, see llms.txt. Markdown versions of all pages are available by appending .md to any URL (e.g. /docs/manual/basics.md).

prelude

Standard library prelude: fundamental types, traits, and operations auto-imported.

This package's contents form the basic vocabulary of Mojo programming that every developer uses. It is implicitly imported to every Mojo program.

The prelude package contains the core types, traits, and functions that are automatically imported into every Mojo program. It provides the foundational building blocks of the language including basic types (Int, String, Bool), essential traits (Copyable, Movable, Equatable), memory primitives (Pointer, Span), and common operations (print, len, range). This package defines the default namespace that makes Mojo code immediately usable without explicit imports.