如何按时间排序
我正在尝试按其类型为time.Time的成员在Go中对结构进行排序。结构如下。
type reviews_data struct { review_id string
date time.Time
score int
firstname string
anonymous bool
review_text string
title_text string
rating float64
upcount int
}
我具有以下用于排序的功能
type timeSlice []reviews_data// Forward request for length
func (p timeSlice) Len() int {
return len(p)
}
// Define compare
func (p timeSlice) Less(i, j int) bool {
return p[i].date.Before(p[j].date)
}
// Define swap over an array
func (p timeSlice) Swap(i, j int) {
p[i], p[j] = p[j], p[i]
}
映射定义如下
var reviews_data_map = make(map[string]reviews_data)
在地图填充值之后,按值对地图进行排序如下
//Sort the map by date date_sorted_reviews := make(timeSlice, 0, len(reviews_data_map))
for _, d := range reviews_data_map {
date_sorted_reviews = append(date_sorted_reviews, d)
}
sort.Sort(date_sorted_reviews)
问题是结果没有排序,谁能告诉我问题是什么。
回答:
在我看来,它看起来像是:
package mainimport (
"fmt"
"sort"
"time"
)
type reviews_data struct {
review_id string
date time.Time
score int
firstname string
anonymous bool
review_text string
title_text string
rating float64
upcount int
}
type timeSlice []reviews_data
func (p timeSlice) Len() int {
return len(p)
}
func (p timeSlice) Less(i, j int) bool {
return p[i].date.Before(p[j].date)
}
func (p timeSlice) Swap(i, j int) {
p[i], p[j] = p[j], p[i]
}
func main() {
var reviews_data_map = make(map[string]reviews_data)
reviews_data_map["1"] = reviews_data{date: time.Now().Add(12 * time.Hour)}
reviews_data_map["2"] = reviews_data{date: time.Now()}
reviews_data_map["3"] = reviews_data{date: time.Now().Add(24 * time.Hour)}
//Sort the map by date
date_sorted_reviews := make(timeSlice, 0, len(reviews_data_map))
for _, d := range reviews_data_map {
date_sorted_reviews = append(date_sorted_reviews, d)
}
fmt.Println(date_sorted_reviews)
sort.Sort(date_sorted_reviews)
fmt.Println(date_sorted_reviews)
}
输出:
[{ {63393534000 0 0x1ba3e0} 0 false 0 0} { {63393490800 0 0x1ba3e0} 0 false 0 0} { {63393577200 0 0x1ba3e0} 0 false 0 0}][{ {63393490800 0 0x1ba3e0} 0 false 0 0} { {63393534000 0 0x1ba3e0} 0 false 0 0} { {63393577200 0 0x1ba3e0} 0 false 0 0}]
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