Data Types

Calcit provides several core data types, all immutable by default for functional programming:

Primitive Types

• Bool: true, false
• Number: f64 in Rust, Number in JavaScript (1, 3.14, -42)
• Tag: Immutable strings starting with : (:keyword, :demo) - similar to Clojure keywords
• String: Text data with special prefix syntax (|text, "|with spaces")

Collection Types

• Vector: Ordered collection serving both List and Vector roles ([] 1 2 3)
• HashMap: Key-value pairs ({} (:a 1) (:b 2))
• HashSet: Unordered unique elements (#{} :a :b :c)

Function Types

• Function: User-defined functions and built-in procedures
• Proc: Internal procedure type for built-in functions

Implementation Details

• Rust runtime: Uses rpds for HashMap/HashSet and ternary-tree for vectors
• JavaScript runtime: Uses ternary-tree.ts for all collections

All data structures are persistent and immutable, following functional programming principles. For detailed information about specific types, see:

• String - String syntax and Tags
• Persistent Data - Implementation details
• EDN - Data notation format