package main

import (
	"fmt"

	"github.com/antonmedv/expr"
)

func main() {
	env := map[string]any{}

	options := []expr.Option{
		expr.Env(env),
		expr.AllowUndefinedVariables(),
	}

	program, err := expr.Compile("(a - b + c) / d", options...)
	if err != nil {
		panic(err)
	}

	res, err := expr.Run(program, map[string]any{
		"a": 1,
		"b": 2,
		"c": 3,
		"d": 4,
	})
	if err != nil {
		panic(err)
	}

	fmt.Printf("%v\n", res)
}