Recent questions tagged Go

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go - global error variable remains nil after initialization

When I initialize an error variable globally it seems that it's nil to another function in the same package. I don' ... nil { panic(loadErr) } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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go - Golang http server blocks when starts a goroutine of infinite-loop

As i learned from golang docs, if i set runtime.GOMAXPROCS(8) with a cpu of 8 cores (intel i7), then ... . What's wrong in my understanding? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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go - Why does append() modify the provided slice? (See example)

You can run the example code on Go Playground. Here is the code: package main import "fmt" func main() ... append doesn't modify its arguments. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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go - How to print struct with String() of fields?

This code: type A struct { t time.Time } func main() { a := A{time.Now()} fmt.Println(a) fmt.Println(a ... a struct, with its fields' String()s? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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go - How to use new URL from mongodb 3.6 to connect from golang

I tried to connect to mongodb Atlas using golang drivers. tlsConfig := &tls.Config{} var mongoURI = " ... am getting no reachable servers See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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963 views

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go - Golang channel output order

func main() { messages := make(chan string) go func() { messages <- "hello" }() go func() { messages <- " ... send first (to msg). Why is that? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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go - How to get all defined types?

package demo type People struct { Name string Age uint } type UserInfo struct { Address string Hobby []string ... from the demo package? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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974 views

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go - Immutable string and pointer address

In Go spec is written: Strings are immutable: once created, it is impossible to change the contents of a ... What is 'immutability' here? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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965 views

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go - How to convert []int8 to string

What's the best way (fastest performance) to convert from []int8 to string? For []byte we could do string( ... I can do string(ba) directly. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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883 views

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go - Get all fields from an interface

How do I know the fields I can access from the reply object/interface? I tried reflection but it seems you ... (reply interface{}, err error) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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929 views

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go - What is the purpose of the package declaration?

Every Go file starts with package <something>. As far as I understand - and this is probably where I am ... , one directory is one package. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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go - Golang floating point precision float32 vs float64

I wrote a program to demonstrate floating point error in Go: func main() { a := float64(0.2) a += 0.1 ... as the C program when using float32? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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964 views

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go - Unmarshal to a interface type

I have some code I've been dumped with and am actually stumped - I've worked with RPC and the JSON side of ... this a bug in Go's marshalling? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

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go - Concisely deep copy a slice?

In Go, what's a concise/well-performing way to deep copy a slice? I need to copy the slice to a new backing ... T is the element type of orig. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

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go - What is the Big O performance of maps in golang?

The "Map types" section of the go language specification describes the interface and general usage of map types ... are clearly separate.) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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959 views

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go - How do you convert a slice into an array?

I am trying to write an application that reads RPM files. The start of each block has a Magic char of [4]byte. ... to [4]byte if needed to? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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828 views

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go - How can I receive an uploaded file using a Golang net/http server?

I'm playing around with Mux and net/http. Lately, I'm trying to get a simple server with one endpoint to accept ... a net/http server in Go? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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888 views

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go - Create a map of string to List

I'd like to create a map of string to container/list.List instances. Is this the correct way to go about it? ... ["key"].Front().Value) } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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973 views

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go - How to find out element position in slice?

How does one determine the position of an element present in slice? I need something like the following: type intSlice [] ... p } } return -1 } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.0k views

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go - How can I ask MongoDB to evaluate some JavaScript in order to obtain value for a field?

I want to let MongoDB dynamically assign a value to one of the fields of the document I'm inserting ... evaluated instead of inserted? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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996 views

1 answer

go - Solving goroutines deadlock

I've been trying to solve this simple problem I encountered in Golang concurrency. I've been searching all possible ... this error?, Thank you. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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870 views

1 answer

go - Unexpected output from time.Time

I just started to learn Go by following a tutorial video on Udemy, and I tried to print the current ... /base format being returned instead? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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914 views

1 answer

go - Can embedded methods access "parent" fields?

Background I've done a fair amount of spec reading and code testing and I think the answer is no, but I want ... your time to a new Gopher. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.0k views

1 answer

go - Date range by week number Golang

With this simple function, I can get the week number. Now, with the number of the week, how can I get the ... Any help is welcome. Thank you. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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918 views

1 answer

go - Why are map values not addressable?

While playing with Go code, I found out that map values are not addressable. For example, package main import "fmt" ... wasn't achieved) in Go. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.2k views

1 answer

go - Multiple receivers on a single channel. Who gets the data?

Unbuffered channels block receivers until data is available on the channel. It's not clear to me how this blocking ... first in line? Random? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

1 answer

go - Golang calling methods on interface pointer

I am using Gorp for database access, Gorp has a standard DbMap type, as well as a Transaction type for when you ... panic(err) } return obj } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

1 answer

go - Unmarshal XML Into a Map

As the title states I am trying to unmarshal my XML directly into a map instead of having to first unmarshal into ... { "ApexClass": "enabled" } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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