Variables

Variables are declared with the let keyword. Every variable must be initialized at declaration.

let x = 42
let y = x + 1
let z = x * y - 10

Variable names must start with a letter or underscore and may contain letters, digits, and underscores.

Rules

• Variables can hold any runtime value: int, float, bool, str, arrays, struct instances, and fn function values.
• A variable may be referenced in any expression declared after it.
• Referencing an undeclared variable is a runtime error (UndefinedVariable).
• Semicolons are optional — Jade inserts them automatically at line boundaries.
• Variables declared inside a function body are local to that call frame and are not visible outside.