func (m Map) Get(key string) string {
	return m[key]
}
Get returns the value pointed to by key.
package exp
import (
	"errors"
	"strconv"
	"github.com/alexkappa/exp/parse"
)
type Exp interface {
	Eval(Params) bool
}
type Params interface {
	Get(string) string
}
type Map map[string]string