func (v *VDict) String() string {
	s := "{"
	for i := range v.keys {
		s += v.keys[i].String() + " " + v.values[i].String() + " "
	}
	return s[:len(s)-1] + "}"
}
String returns the value of the dictionary formatted as a string.
package vdict
import (
	"hawx.me/code/vodka/stack"
	"hawx.me/code/vodka/types"
	"hawx.me/code/vodka/types/vboolean"
	"hawx.me/code/vodka/types/vnil"
)
type VDict struct {
	keys   []types.VType
	values []types.VType
}