func NewFloat64Sync(nums []float64) *Float64Sync {
	s := &Float64Sync{}
	for _, num := range nums {
		s.Add(num)
	}
	return s
}
NewFloat64Sync creates set
package set
import "sync"
type Float64Sync struct {
	nodeMap map[float64]struct{}
	sync.RWMutex
}