Augment Golo in Go

1. Add a new predefined function

Create a new golang file in the predefined folder, for example notifications.go, with the following content:

package predefined

import (
	"fmt"
	"golo/object"
)

func Information(args ...object.Object) object.Object {
	fmt.Println("[INFO]", args[0].Inspect())
	return nil
}

• The function must accept a variable number of object.Object arguments and return an object.Object.
• You can use args[0].Inspect() to get the string representation of the first argument.
• Return nil if the function does not need to return a value.
• Always use the predefined package for predefined functions.

2. Register the new function in predefined/registered.functions.go

In the predefined/registered.functions.go file, add your new function to the PredefinedFunctions map:

map[string]*object.Builtin{
    // ... other predefined functions ...
		"information": {
			Fn: Information,
		},
    // ... other predefined functions ...
}

3. Rebuild the Golo binary

go build

4. Use your new predefined function in Golo

main.golo:

module demo.main

function main = |args| {
  information("this is a test message")
}

Then, run:

golo main.golo

The output should be:

[INFO] this is a test message