Basics#

Start here to understand a source file and the values inside a function. Read source structure and bindings first. The grammar is an exact reference; you can return to it when you need to check a particular syntax rule.

Concept	What you will learn
Source files	Read a source file, indentation, comments, and multiline expressions.
Variables and scope	Choose let or var, infer local types, and understand shadowing.
Numbers and booleans	Use numeric literals, explicit conversions, checked arithmetic, and durations.
Strings and bytes	Interpolate text, encode UTF-8, and distinguish character boundaries.
Expressions and operators	Apply precedence, operand types, and evaluation order.
Source grammar	Check the exact accepted tokens, declarations, suites, and patterns.

Read the grammar as a reference after the practical pages.