j.joa/docs Experimental
Docs/Types
THE JOA LANGUAGE

Types

Explore Joa runtime types, including integers, strings, lists, maps, IP addresses, subnets, and null.

Joa is dynamically typed. Every value carries its type at runtime.

Type Description Example
Integer 64-bit signed integer 42, -7, 0
Float 64-bit floating point 3.14, -0.5
String UTF-8 text "hello"
Bool Boolean true, false
Null Absence of a value null
List Ordered, heterogeneous collection [1, "a", true]
Map Key-value dictionary {name: "Alice", age: 30}
IP IPv4 address (native type) 192.168.1.1
Subnet IPv4 CIDR block (native type) 192.168.1.0/24
Agent Agent configuration with simulated methods AI agents
Function User-defined function (supports closures) Functions

The null Literal

null is a first-class value and keyword. It represents the deliberate absence of a value. Functions that do not return a value implicitly return null.

let empty = null
print(type(null))    // Null

if not empty {
    print("no value")   // executes — null is falsy
}

Type Inspection

print(type(42))          // Integer
print(type("hello"))     // String
print(type(192.168.1.1)) // IP
print(type(10.0.0.0/8))  // Subnet
print(type(null))        // Null
print(type({}))          // Map

Type Conversion

let n = int("42")       // String → Integer: 42
let f = float(7)        // Integer → Float: 7.0
let s = str(3.14)       // any → String: "3.14"