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Creating and Using Modules

Modules in Flow-Wing are defined using the module keyword, followed by the module name enclosed in square brackets. The module file should be suffixed with -module.fg to clearly indicate that it is a module.

Syntax for Creating a Module:​

module [module_name]

Example​

module [local]

type T = {
  a:int
}

var x:int

Using a Module​

To use items from a module, the bring statement is employed. Once a module is brought in, its types, classes, variables, and functions can be accessed using the module's namespace (module_name::item).

Syntax for Creating a Module:​

bring module_name

OR

bring "module_name-module.fg"

Accessing Items in the Module:​

var instance:module_name::Type = {}
var obj:module_name::ClassName = new module_name::ClassName()

Example​

  • local-module.fg
module [local]

type T = {
  a:int 
}

var x:int

class A {
  var tInstance:local::T 
  var u:int

  init() -> nthg {
      self.tInstance = {a:0}
      self.u = 0
  }

  printData() -> nthg {
      print("T instance: ", self.tInstance)
      print("U value: ", self.u)
  }
}
  • task.fg
bring local

var localInstance: local::T = {}
var objectInstance: local::A = new local::A()

print(objectInstance.tInstance)
print(objectInstance.u)

objectInstance.tInstance = {a:21}
print(objectInstance.tInstance)

objectInstance.printData()