What it does: - Embed in Go with 3 lines: New(), Bind(), Call(), Eval() - Bind Go structs and functions directly — scripts see fields and call methods - Type inference catches errors before runtime, but you rarely write annotations - Option/Result instead of nil — no surprise panics in production - Stdlib covers HTTP, WebSocket, gRPC, SQLite, JSON, CSV, async tasks out of the box

Use cases I built it for: - Business rules that change without redeploying the Go host - Data pipelines and ETL scripts - Configuration that's more than YAML but less than a full app

Example embedding:

Use case: discount rules your ops team can change without redeploy

Go side:

    type Discounts struct {
        VIPPercent     float64
        HolidayPercent float64
        MinOrder       float64
    }
    func (d *Discounts) SetVIP(pct float64)     { d.VIPPercent = pct }
    func (d *Discounts) SetHoliday(pct float64)  { d.HolidayPercent = pct }
    func (d *Discounts) SetMinOrder(min float64)  { d.MinOrder = min }

    discounts := &Discounts{VIPPercent: 0.05, HolidayPercent: 0.0, MinOrder: 100}
    vm := funxy.New()
    vm.Bind("discounts", discounts)
    vm.LoadFile("rules.lang")
    vm.Call("updateRules")
    // discounts.VIPPercent is now 0.15
    // discounts.HolidayPercent is now 0.10
    // discounts.MinOrder is now 50 — no redeploy needed

    fun updateRules() {
        // Black Friday campaign
        discounts.SetVIP(0.15)
        discounts.SetHoliday(0.10)
        discounts.SetMinOrder(50.0)
    }