Recent questions tagged go

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go - Can someone explain why GOPATH is convenient and how it should be used in general?

I am new to Go programming language and every tutorial starts off from setting GOPATH to current project folder. ... GOPATH and GOROOT then? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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go - How do I dynamically change the struct's json tag?

I have the following: package main import ( "encoding/json" "fmt" "os" "reflect" ) type User struct { ... https://play.golang.org/p/Qi8Jq_4W0t See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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655 views

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go - Why are request.URL.Host and Scheme blank in the development server?

I'm very new to Go. Tried this first hello, world from the documentation, and wanted to read the Host and ... their values are both blank. Why? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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go - How to disable Golang unused import error

By default, Go treats unused import as error, forcing you to delete the import. I want to know if there ... when developing a GAE program. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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832 views

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go - Unstructured MongoDB collections with mgo

I'm VERY new to Go. From what I've seen in the examples of mGo, in order to query a collection and then read ... to do the same in Go / mGo? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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755 views

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go - Built-In source code location

Where in Go's source code can I find their implementation of make. Turns out the "code search" ... somewhere deep in compiler-land. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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773 views

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go - Convert an integer to a byte array

I have a function which receives a []byte but what I have is an int, what is the best way to go about this ... there are better ways to do it. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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951 views

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go - Why would a call to fmt.Sprint(e) inside the Error() method result in an infinite loop?

I am going through "A Tour of Go" tutorial. I would like to check the answer to this question: Note: a ... forth, resulting in an infinite loop. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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go - Is there a better dependency injection pattern in golang?

Given this code: package main import ( "fmt" ) type datstr string type Guy interface { SomeDumbGuy() string } ... , or am I overthinking it? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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go - Error "can't load package: package my_prog: found packages my_prog and main"

In my GOPATH I have something like this: /bin/ /pkg/ /src/ /src/my_prog/ /src/my_prog/main.go /src/my_prog/ ... so, what is the reason for this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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926 views

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go - How to decode JSON with type convert from string to float64

I need to decode a JSON string with the float number like: {"name":"Galaxy Nexus", "price":"3460.00"} ... the JSON string with type convert. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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732 views

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go - How to insert multiple data at once

I know that Insert multiple data at once more efficiency: INSERT INTO test(n1, n2, n3) VALUES(v1, v2, ... insert mulitple data at once. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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747 views

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go - How to set headers in http get request?

I'm doing a simple http GET in Go: client := &http.Client{} req, _ := http.NewRequest("GET", url, nil ... the request header in the doc, thanks See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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go - Showing custom 404 error page with standard http package

Assuming that we have: http.HandleFunc("/smth", smthPage) http.HandleFunc("/", homePage) User sees a plain "404 ... *http.Request) as you want. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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733 views

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go - How to index characters in a Golang string?

How to get an "E" output rather than 69? package main import "fmt" func main() { fmt.Print("HELLO"[1]) ... a char to byte and vice versa? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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853 views

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go - How to split a string and assign it to variables

In Python it is possible to split a string and assign it to variables: ip, port = '127.0.0.1:5432'. ... string and assign values in one step? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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842 views

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go - How to get the current function name

For tracing purpose, I'd like to print out current function name, like the __FUNCTION__ macro in gcc. So that ... ... or something like that. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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725 views

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go - Meaning of ...interface{} (dot dot dot interface)

Below is a piece of Go code I have question about. Specifically, what is a in this function? func DPrintf(format ... does ...interface{} do? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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go - "undefined" function declared in another file?

I'm trying to write a basic go program that calls a function on a different file, but a part of the same package ... ) { return "Hello world!" } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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748 views

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go - How to know TCP connection is closed in net package?

I'm implementing a small TCP server. How do I know if one of my clients closed? Should I just try to read or write and check if err is nil? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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811 views

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go - Is there a way to do repetitive tasks at intervals?

Is there a way to do repetitive background tasks in Go? I'm thinking of something like Timer.schedule(task, delay ... time.Sleep(time.Minute) } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.2k views

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go - Decoding JSON using json.Unmarshal vs json.NewDecoder.Decode

I'm developing an API client where I need to encode a JSON payload on request and decode a JSON body ... really avoid using json.Unmarshal? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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659 views

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go - Golang production web application configuration

For those of you running Go backends in production: What is your stack / configuration for running a Go web ... invest too much into it. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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768 views

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go - Can't unmarshall JSON with key names having spaces

Some JSON data I am getting have spaces in the key names. I am using standard encoding/json library to unmarshal ... what can I do here? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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941 views

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go - Golang converting float64 to int error

How can I avoid floating point errors when converting float's to int's. For example the following code prints ... ) } Output: 0.5499999999999972 See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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885 views

1 answer

go - How to change a float64 number to uint64 in a right way?

package main func main() { var n float64 = 6161047830682206209 println(uint64(n)) } The output will be: ... uint64, the fraction is discarded. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

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go - How to remove unused code at compile time?

We've built a Go package that is used by many of us. It's imported using the standard import ("package- ... from Go programs at compile time? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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867 views

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go - Big O of append in Golang

What is the complexity of Go's builtin append function? What about string concatenation using +? I'd like ... to string concatenation using +. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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