Scope modifiers: Difference between revisions

=={{header|Wren}}==

Wren uses lexical scoping and has no scope modifiers as such.

However, instance and static fields of a class always begin respectively with one underscore or two underscores (nothing else can) and are always private to the class.

In the following example, the attempt to access the private field is picked up at compile time (Wren has a single-pass 'bytecode' compiler) and so the penultimate line, although OK, doesn't print.

<lang ecmascript>class MyClass {

construct new(a) {

_a = a // creates an instance field _a automatically

}

a { _a } // allow public access to the field

}

var mc = MyClass.new(3)

System.print(mc.a) // fine

System.print(mc._a) // can't access _a directly as its private to the class</lang>

{{out}}

<pre>

$ wren scope_modifiers.wren

[./scope_modifiers line 10] Error at '_a': Expect method name after '.'.

</pre>