object

type Array struct {
	Elements []Object
}

type Boolean struct {
	Value bool
}

type Builtin struct {
	Fn BuiltinFunction
}

type BuiltinFunction func(args ...Object) Object

type Environment interface {
	// Get retrieves the value of a variable named by the `name`.
	// If the variable is present in the environment the value is returned and the boolean is true.
	// Otherwise the returned value will be nil and the boolean will be false.
	Get(name string) (Object, bool)

	// Set sets the `val` of a variable named by the `name` and returns the `val` itself.
	Set(name string, val Object) Object
}

type Error struct {
	Message string
}

type Float struct {
	Value float64
}

type Function struct {
	Parameters []*ast.Ident
	Body       *ast.BlockStatement
	Env        Environment
}

type Hash struct {
	Pairs map[HashKey]HashPair
}

type HashKey struct {
	Type  Type
	Value uint64
}

type HashPair struct {
	Key   Object
	Value Object
}

type Hashable interface {
	HashKey() HashKey
}

type Integer struct {
	Value int64
}

type Macro struct {
	Parameters []*ast.Ident
	Body       *ast.BlockStatement
	Env        Environment
}

type Nil struct{}

type Object interface {
	Type() Type
	Inspect() string
}

type Quote struct {
	ast.Node
}

type ReturnValue struct {
	Value Object
}

type String struct {
	Value string
}

type Type string