Environment variables: Difference between revisions

writeln "USER: ", _env["USER"]</syntaxhighlight>

 

We could also the short-hand form of indexing by string. This is limited to code points used for tokens and does not allow for spaces, nor an index alternate.

<syntaxhighlight lang="langur">writeln "HOME: ", _env'HOME

 

However, if Wren is embedded in (say) a suitable Go program, then we can ask the latter to obtain it for us.

class Environ {

foreign static variable(name)

which we embed in the following Go program and run it.

{{libheader|WrenGo}}

package main

 

func main() {

vm := wren.NewVM()

methodMap := wren.MethodMap{"static variable(_)": getEnvironVariable}

classMap := wren.ClassMap{"Environ": wren.NewClass(nil, nil, methodMap)}