Modules

A script can use the top-level names of another script file.

utils.jmp:

dyn greet(name) { return "Hello, " + name; }
dyn VERSION = "1.0";
class Counter { int n; void inc() { n++; } }

main.jmp, in the same folder:

import "utils";          // or "utils.jmp"; the path is relative to this file's folder

println(greet("modules"), VERSION);   // Hello, modules 1.0
dyn c = new Counter();
c.inc();
println(c.n);                          // 1

• Every top-level function, class and variable of the module becomes a name in the importing block, visible in the whole block.
• A module runs once per interpreter, however many files import it. Imports in a circle are an error.
• Imported names are constants: they cannot be assigned. Variables keep the value they had when the module ran; tables and objects are shared.
• Under an access policy modules are off unless the policy has Policy.allowModules();.

Java classes are imported differently, by name: import java.util.HashMap; - see Java interop.