You can easily check if a key exists in a go map by using the ok result:
value, ok := myMap[key]
Or in an one line check:
if val, ok := myMap[key]; ok {
// do something
}
Tag: go
Golang: Reverse ISOWeek, get the date of the first day of ISO week
If you work with weeknummers, you can find the weeknumber of a date with the Golang function time.ISOWeek. However you wish to get the first date of a week, there is no such function in Google Go. So let’s write it our selfs:
func FirstDayOfISOWeek(year int, week int, timezone *time.Location) time.Time {
date := time.Date(year, 0, 0, 0, 0, 0, 0, timezone)
isoYear, isoWeek := date.ISOWeek()
// iterate back to Monday
for date.Weekday() != time.Monday {
date = date.AddDate(0, 0, -1)
isoYear, isoWeek = date.ISOWeek()
}
// iterate forward to the first day of the first week
for isoYear < year {
date = date.AddDate(0, 0, 7)
isoYear, isoWeek = date.ISOWeek()
}
// iterate forward to the first day of the given week
for isoWeek < week {
date = date.AddDate(0, 0, 7)
isoYear, isoWeek = date.ISOWeek()
}
return date
}
Golang create directory
Creating a directory from Google Go is simple with the “os” package. See the example below.
Golang create directory example
path := "/folder/to/create"
err := os.MkdirAll(path,0711)
if err != nil {
log.Println("Error creating directory")
log.Println(err)
return
}
Golang delete file
Deleting a file from Google Go (Golang) is simple with the “os” package. See the example below.
Golang delete file example
path := "/path/to/file/to/delete"
err := os.Remove(path)
if err != nil {
fmt.Println(err)
return
}
