Language Expansion

Purpose

• move from expression parser to statement language
• add bindings, flow, and callable units

Truth model

• falsey: false, nil
• truthy: everything else

Variables and assignment

• declarations: let / var / const
• assignment vs declaration distinction
• block scope in syntax (name resolution in later passes)

Statements added

• variable declaration
• assignment and expression statements
• if/else
• while
• return
• block

Functions in this stage

• top-level fn name(params) { ... }
• body is a statement block
• enables call semantics in later phases

Practice focus

• top-level function vs nested statement parsing
• falsey checks
• control-flow parse shape
• statement classification by token lookahead