Go Examples

Go, also known as Golang, is a statically typed, compiled programming language designed at Google by Robert Griesemer, Rob Pike, and Ken Thompson. Go is syntactically similar to C, but with memory safety, garbage collection, structural typing, and CSP-style concurrency.

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Group By in Go
by yhuang fmt.Println fmt
Set Last Value in Go
by yhuang fmt fmt.Println
Set First Value in Go
by yhuang fmt fmt.Println
Get Sublist from Index to End in Go
by yhuang fmt fmt.Println
Get Sublist from Start to Index in Go
by yhuang fmt fmt.Println
Get Sublist Between Indexes in Go
by yhuang fmt fmt.Println
Join Integers in Go
by yhuang fmt fmt.Println fmt.Sprint strings strings.Join
Get First Value in Go
by yhuang fmt fmt.Println
Get Last Value in Go
by yhuang fmt fmt.Println
Create List in Go
by yhuang fmt.Println fmt
Get Length in Go
by yhuang fmt.Println fmt
Compare Two Lists in Go
by yhuang fmt.Println fmt
List Batching in Go
by yhuang fmt fmt.Println
Shuffle List in Go
by yhuang fmt.Println fmt math/rand rand.Intn rand.Seed
Reverse List in Go
by yhuang fmt fmt.Println
Copy List in Go
by yhuang fmt.Println fmt
Insert List at Index in Go
by yhuang fmt fmt.Println
Insert List at Start in Go
by yhuang fmt fmt.Println
Insert List at End in Go
by yhuang fmt fmt.Println
Insert Value at Index in Go
by yhuang fmt fmt.Println
Insert Value at Start in Go
by yhuang fmt fmt.Println
Insert Value at End in Go
by yhuang fmt fmt.Println
Set Value at Index in Go
by yhuang fmt fmt.Println
Remove First Value in Go
by yhuang fmt fmt.Println
Remove Last Value in Go
by yhuang fmt fmt.Println
Find Index by Value in Go
by yhuang fmt fmt.Println strings strings.HasPrefix
Find by Value in Go
by yhuang fmt fmt.Println strings strings.HasPrefix
Get Value at Index in Go
by yhuang fmt fmt.Println
Get Day Offset within Year in Go
by yhuang fmt fmt.Println time time.Now
YearDay returns the day of the year specified by t, in the range [1,365] for non-leap years, and [1,366] in leap years.
Get Day Offset within Week in Go
by yhuang fmt.Println fmt time time.Monday time.Now
Get Microseconds in Duration in Go
by yhuang fmt fmt.Printf time time.ParseDuration
Get Milliseconds in Duration in Go
by yhuang fmt fmt.Printf time time.ParseDuration
Get Microsecond Offset within Second in Go
by yhuang fmt fmt.Println time time.Now
Get Millisecond Offset within Second in Go
by yhuang fmt fmt.Println time time.Now
Get Nanosecond Offset within Second in Go
by yhuang fmt fmt.Println time time.Now
Nanosecond returns the nanosecond offset within the second specified by t, in the range [0, 999999999].
Get Second Offset within Minute in Go
by yhuang fmt fmt.Println time time.Now
Second returns the second offset within the minute specified by t, in the range [0, 59].
Get Minute Offset within Hour in Go
by yhuang fmt fmt.Println time time.Now
Minute returns the minute offset within the hour specified by t, in the range [0, 59].
Get Hour Offset within Day in Go
by yhuang fmt fmt.Println time time.Now
Hour returns the hour within the day specified by t, in the range [0, 23].
Get Week Offset within Year in Go
by yhuang fmt fmt.Println time time.Now
Get Month Offset within Year in Go
by yhuang fmt.Println fmt time time.January time.Now
Get Year of Time in Go
by yhuang fmt fmt.Println time time.Now
Escape HTML Content in Go
by yhuang fmt fmt.Println html html.EscapeString
Dial for SMTP Connection in Go
by yhuang log log.Fatal net/smtp smtp.Dial
Generate Bcrypt Hash in Go
by yhuang fmt.Println bcrypt.CompareHashAndPassword bcrypt.GenerateFromPassword fmt golang.org/x/crypto/bcrypt
Web Socket Server in Go
by yhuang http.HandleFunc http.Request http.ResponseWriter fmt fmt.Printf
Encode JSON Response in Go
by yhuang encoding/json http.HandleFunc http.ListenAndServe http.Request http.ResponseWriter
Decode JSON Request in Go
by yhuang encoding/json fmt fmt.Fprintf http.HandleFunc http.ListenAndServe
HTTP Cookie Session in Go
by yhuang http.HandleFunc http.Request http.ResponseWriter fmt fmt.Fprintln
Log HTTP Requests in Go
by yhuang http.HandlerFunc http.Request http.ResponseWriter fmt fmt.Fprintln
HTTP Serve Static Files in Go
by yhuang http.Dir http.FileServer http.Handle http.ListenAndServe http.StripPrefix
Delete MySQL Rows in Go
by yhuang
Get All MySQL Rows in Go
by yhuang
Query MySQL Rows in Go
by yhuang
Insert MySQL Row in Go
by yhuang
Create a MySQL Table in Go
by yhuang
Connect to MySQL Database in Go
by yhuang
Routing in Go with gorilla/mux
by yhuang fmt fmt.Fprintf github.com/gorilla/mux http.ListenAndServe http.Request
Dot Product Matrix in Go
by yhuang mat.NewDense fmt fmt.Printf gonum.org/v1/gonum/mat mat.Dense
Sleep on Current Thread in Go
by yhuang fmt.Printf time.Now fmt time time.Second
Download File to Disk in Go
by yhuang http.Get io io.Copy net/http os
ValidString in Go
by GoDoc fmt.Println utf8.ValidString fmt unicode/utf8
ValidString reports whether s consists entirely of valid UTF-8-encoded runes.
ValidRune in Go
by GoDoc fmt.Println utf8.ValidRune fmt unicode/utf8
ValidRune reports whether r can be legally encoded as UTF-8. Code points that are out of range or a surrogate half are illegal.
Valid in Go
by GoDoc fmt.Println utf8.Valid fmt unicode/utf8
Valid reports whether p consists entirely of valid UTF-8-encoded runes.
RuneStart in Go
by GoDoc fmt.Println utf8.RuneStart fmt unicode/utf8
RuneStart reports whether the byte could be the first byte of an encoded, possibly invalid rune. Second and subsequent bytes always have the top two bits set to 10.
RuneLen in Go
by GoDoc fmt.Println utf8.RuneLen fmt unicode/utf8
RuneLen returns the number of bytes required to encode the rune. It returns -1 if the rune is not a valid value to encode in UTF-8.
RuneCountInString in Go
by GoDoc fmt.Println fmt unicode/utf8 utf8.RuneCountInString
RuneCountInString is like RuneCount but its input is a string.
RuneCount in Go
by GoDoc fmt.Println fmt unicode/utf8 utf8.RuneCount
RuneCount returns the number of runes in p. Erroneous and short encodings are treated as single runes of width 1 byte.
FullRuneInString in Go
by GoDoc fmt.Println utf8.FullRuneInString fmt unicode/utf8
FullRuneInString is like FullRune but its input is a string.
FullRune in Go
by GoDoc fmt.Println utf8.FullRune fmt unicode/utf8
FullRune reports whether the bytes in p begin with a full UTF-8 encoding of a rune. An invalid encoding is considered a full Rune since it will convert as a width-1 error rune.
EncodeRune in Go
by GoDoc fmt.Println fmt unicode/utf8 utf8.EncodeRune
EncodeRune writes into p (which must be large enough) the UTF-8 encoding of the rune. It returns the number of bytes written.
DecodeRuneInString in Go
by GoDoc fmt fmt.Printf unicode/utf8 utf8.DecodeRuneInString
DecodeRuneInString is like DecodeRune but its input is a string. If s is empty it returns (RuneError, 0). Otherwise, if the encoding is invalid, it returns (RuneError, 1). Both are impossible results for correct, non-empty UTF-8.
DecodeRune in Go
by GoDoc fmt fmt.Printf unicode/utf8 utf8.DecodeRune
DecodeRune unpacks the first UTF-8 encoding in p and returns the rune and its width in bytes. If p is empty it returns (RuneError, 0). Otherwise, if the encoding is invalid, it returns (RuneError, 1). Both are impossible results for correct, non-empty UTF-8.
DecodeLastRuneInString in Go
by GoDoc fmt fmt.Printf unicode/utf8 utf8.DecodeLastRuneInString
DecodeLastRuneInString is like DecodeLastRune but its input is a string. If s is empty it returns (RuneError, 0). Otherwise, if the encoding is invalid, it returns (RuneError, 1). Both are impossible results for correct, non-empty UTF-8.
DecodeLastRune in Go
by GoDoc fmt fmt.Printf unicode/utf8 utf8.DecodeLastRune
DecodeLastRune unpacks the last UTF-8 encoding in p and returns the rune and its width in bytes. If p is empty it returns (RuneError, 0). Otherwise, if the encoding is invalid, it returns (RuneError, 1). Both are impossible results for correct, non-empty UTF-8.
Using unicode (Is) in Go
by GoDoc fmt.Println unicode.IsPrint fmt fmt.Printf unicode
Functions starting with "Is" can be used to inspect which table of range a rune belongs to. Note that runes may fit into more than one range.
ToUpper in Go
by GoDoc fmt fmt.Printf unicode unicode.ToUpper
ToUpper maps the rune to upper case.
ToTitle in Go
by GoDoc fmt fmt.Printf unicode unicode.ToTitle
ToTitle maps the rune to title case.
ToLower in Go
by GoDoc fmt fmt.Printf unicode unicode.ToLower
ToLower maps the rune to lower case.
To in Go
by GoDoc fmt.Printf unicode.To unicode.LowerCase unicode.TitleCase unicode.UpperCase
To maps the rune to the specified case: UpperCase, LowerCase, or TitleCase.
SpecialCase in Go
by GoDoc fmt.Printf unicode.TurkishCase.ToLower unicode.TurkishCase.ToTitle unicode.TurkishCase.ToUpper fmt
SpecialCase represents language-specific case mappings such as Turkish. Methods of SpecialCase customize (by overriding) the standard mappings.
SimpleFold in Go
by GoDoc fmt.Printf unicode.SimpleFold fmt unicode
SimpleFold iterates over Unicode code points equivalent under the Unicode-defined simple case folding. Among the code points equivalent to rune (including rune itself), SimpleFold returns the smallest rune > r if one exists, or else the smallest rune >= 0. If r is not a valid Unicode code point, Sim...
Time.Unix in Go
by GoDoc fmt.Println time.Unix fmt time time.Date
Unix returns t as a Unix time, the number of seconds elapsed since January 1, 1970 UTC. The result does not depend on the location associated with t.
Time.Truncate in Go
by GoDoc time.Minute time.Second fmt fmt.Printf time
Truncate returns the result of rounding t down to a multiple of d (since the zero time). If d <= 0, Truncate returns t stripped of any monotonic clock reading but otherwise unchanged.
Time.Sub in Go
by GoDoc time.Date time.UTC fmt fmt.Printf time
Sub returns the duration t-u. If the result exceeds the maximum (or minimum) value that can be stored in a Duration, the maximum (or minimum) duration will be returned. To compute t-d for a duration d, use t.Add(-d).
Time.String in Go
by GoDoc fmt.Printf time.Date time.UTC fmt time
String returns the time formatted using the format string
Time.Round in Go
by GoDoc time.Minute time.Second fmt fmt.Printf time
Round returns the result of rounding t to the nearest multiple of d (since the zero time). The rounding behavior for halfway values is to round up. If d <= 0, Round returns t stripped of any monotonic clock reading but otherwise unchanged.
Time.Format in Go
by GoDoc time.UnixDate fmt.Printf fmt.Println time.Parse fmt
Format returns a textual representation of the time value formatted according to layout, which defines the format by showing how the reference time, defined to be
Time.Equal in Go
by GoDoc fmt.Printf time.Date fmt time time.FixedZone
Equal reports whether t and u represent the same time instant. Two times can be equal even if they are in different locations. For example, 6:00 +0200 CEST and 4:00 UTC are Equal. See the documentation on the Time type for the pitfalls of using == with Time values; most code should use Equal instead...
Time.Day in Go
by GoDoc fmt fmt.Printf time time.Date time.UTC
Day returns the day of the month specified by t.
Time.Date in Go
by GoDoc fmt.Printf fmt time time.Date time.UTC
Date returns the year, month, and day in which t occurs.
Time.Before in Go
by GoDoc fmt.Printf time.Date time.UTC fmt time
Before reports whether the time instant t is before u.
Time.AppendFormat in Go
by GoDoc fmt fmt.Println time time.Date time.Kitchen
AppendFormat is like Format but appends the textual representation to b and returns the extended buffer.
Time.After in Go
by GoDoc fmt.Printf time.Date time.UTC fmt time
After reports whether the time instant t is after u.
Time.AddDate in Go
by GoDoc fmt.Printf fmt time time.Date time.UTC
AddDate returns the time corresponding to adding the given number of years, months, and days to t. For example, AddDate(-1, 2, 3) applied to January 1, 2011 returns March 4, 2010.
Time.Add in Go
by GoDoc fmt.Printf time.Hour fmt time time.Date
Add returns the time t+d.
Tick in Go
by GoDoc fmt fmt.Printf time time.Second time.Tick
Tick is a convenience wrapper for NewTicker providing access to the ticking channel only. While Tick is useful for clients that have no need to shut down the Ticker, be aware that without a way to shut it down the underlying Ticker cannot be recovered by the garbage collector; it "leaks". Unlike New...
Sleep in Go
by GoDoc time time.Millisecond time.Sleep
Sleep pauses the current goroutine for at least the duration d. A negative or zero duration causes Sleep to return immediately.
ParseInLocation in Go
by GoDoc fmt.Println time.ParseInLocation fmt time time.LoadLocation
ParseInLocation is like Parse but differs in two important ways. First, in the absence of time zone information, Parse interprets a time as UTC; ParseInLocation interprets the time as in the given location. Second, when given a zone offset or abbreviation, Parse tries to match it against the Local l...
ParseDuration in Go
by GoDoc time.ParseDuration fmt.Printf fmt.Println fmt time
ParseDuration parses a duration string. A duration string is a possibly signed sequence of decimal numbers, each with optional fraction and a unit suffix, such as "300ms", "-1.5h" or "2h45m". Valid time units are "ns", "us" (or "µs"), "ms", "s", "m", "h".
Parse in Go
by GoDoc fmt.Println time.Parse time.RFC3339 fmt time
Parse parses a formatted string and returns the time value it represents. The layout defines the format by showing how the reference time, defined to be