Doomsday Manual

Link to this comparison view

--- script:walkthrough:scopes [2019-11-25 06:34] – skyjake
+++ script:walkthrough:scopes [2019-11-25 08:55] (current) – [Importing modules] skyjake
@@ Line 1: / Line 1: @@
+<- Functions ^ ^ Miscellaneous ->
+====== Scopes ======
+The following scopes (namespaces) are defined:
+  * Each module has its own global scope.
+  * Each function has its own local scope.
+  * In a class definition, the scope is the [[records#classes|class namespace]].
+===== Global assignment =====
+The global assignment '':='' operator inserts variables to the module's global namespace.
+  a = 1
+  def globalAssign()
+      a := 2
+  end
+  globalAssign()
+  print a
+Output:
+===== Local namespace =====
+Built-in function ''locals()'' returns the local namespace as a record.
+  # script "test.ds"
+  a = 'hello'; b = 'world'
+  print locals()
+Output:
+  __file__:/src/test.ds
+  a:       hello
+  b:       world
+===== Importing modules =====
+The ''import'' keyword is used to import modules. All built-in modules and all script files on the [[fs:packages#scripting|import path]] are available for importing.
+  import App
+When a module is first imported, its global namespace is initialized by executing all statements in the module's global scope. All modules that then import the module will receive a reference to the same record.
+The import statement can also be used to make a copy instead of regular importing.
+  import record other
+This imports //other// (from a file called **other.ds** somewhere on the import path), makes an owned copy of the record, and assigns it to a local variable named //other//. It is equivalent to the following:
+  import other
+  other = Record(other)

Doomsday Manual

User Tools

Site Tools

Page Tools