call_method

CallMethod and CreateInstance Example

This example demonstrates how to create instances of Scriptling classes from Go and call methods on them using the new CreateInstance, CallMethod, and CallMethodWithContext APIs.

Features Demonstrated

1. CreateInstance - Create instances of Scriptling classes from Go
2. CallMethod - Call methods on Scriptling instances from Go
3. Kwargs support - Pass keyword arguments to methods
4. Multiple instances - Create and manage multiple independent instances
5. Bidirectional integration - Store instances in the environment and use them from both Go and Scriptling

Running the Example

go run main.go

Key Concepts

Creating Instances

// Create an instance with positional arguments
instance, err := p.CreateInstance("Counter", 100)

// Create an instance with kwargs
account, err := p.CreateInstance("BankAccount", "Alice", scriptling.Kwargs{"balance": 1000})

Calling Methods

// Call a method with no arguments
result, err := p.CallMethod(instance, "get")

// Call a method with positional arguments
result, err := p.CallMethod(instance, "increment", 10)

// Call a method with kwargs
result, err := p.CallMethod(instance, "increment", scriptling.Kwargs{"amount": 10})

Extracting Results

// Extract different types from results
intVal, _ := result.AsInt()
strVal, _ := result.AsString()
floatVal, _ := result.AsFloat()
boolVal, _ := result.AsBool()

Storing Instances

// Store instance in environment for use in scripts
p.SetObjectVar("counter", instance)

// Now use it from Scriptling
p.Eval(`
counter.increment(25)
value = counter.get()
`)

Use Cases

• Stateful operations - Maintain state across multiple Go function calls
• Object-oriented integration - Work with Scriptling classes naturally from Go
• Plugin systems - Load and instantiate Scriptling classes dynamically
• Testing - Create test fixtures and verify behavior from Go tests
• Hybrid applications - Mix Go and Scriptling code seamlessly