search
HomeBackend DevelopmentGolangWhen Should You Use Blank Identifiers for Importing Packages in Go?

When Should You Use Blank Identifiers for Importing Packages in Go?

Importing with Blank Identifier in Go: A Practical Application

The Go programming language allows for importing packages solely for their side effects, such as initialization. This is achieved by assigning a blank identifier as the package name. While the general concept is understood, specific real-world examples of this practice can be elusive.

One such use case is the initialization of external resources. For instance, a package may need to register a database driver with the standard library's database/sql package. This can be done through the package's init function:

package mydatabase

func init() {
    sql.Register("mydriver", &MyDriver{})
}

By importing the mydatabase package with a blank identifier in the main program, the init function will be executed, but the package's exported functions will not be used:

import _ "mydatabase"

func main() {
    // ...
}

Another scenario is configuring logging. A package may provide a default logging configuration in its init function, which can be imported into the main program without explicitly using any of its functions:

package mylogging

func init() {
    log.SetFlags(log.Lshortfile | log.LstdFlags)
}

In the main program:

import _ "mylogging"

func main() {
    // ...
    log.Println("Application started")
}

By utilizing the blank identifier, we can avoid the need to declare unnecessary and unused variables in the main program, making the code cleaner and more maintainable.

These examples illustrate the practical application of importing with a blank identifier in Go, allowing for side-effect initialization of external resources and configuration of global settings.

The above is the detailed content of When Should You Use Blank Identifiers for Importing Packages in Go?. For more information, please follow other related articles on the PHP Chinese website!

Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Golang vs. Python: The Pros and ConsGolang vs. Python: The Pros and ConsApr 21, 2025 am 12:17 AM

Golangisidealforbuildingscalablesystemsduetoitsefficiencyandconcurrency,whilePythonexcelsinquickscriptinganddataanalysisduetoitssimplicityandvastecosystem.Golang'sdesignencouragesclean,readablecodeanditsgoroutinesenableefficientconcurrentoperations,t

Golang and C  : Concurrency vs. Raw SpeedGolang and C : Concurrency vs. Raw SpeedApr 21, 2025 am 12:16 AM

Golang is better than C in concurrency, while C is better than Golang in raw speed. 1) Golang achieves efficient concurrency through goroutine and channel, which is suitable for handling a large number of concurrent tasks. 2)C Through compiler optimization and standard library, it provides high performance close to hardware, suitable for applications that require extreme optimization.

Why Use Golang? Benefits and Advantages ExplainedWhy Use Golang? Benefits and Advantages ExplainedApr 21, 2025 am 12:15 AM

Reasons for choosing Golang include: 1) high concurrency performance, 2) static type system, 3) garbage collection mechanism, 4) rich standard libraries and ecosystems, which make it an ideal choice for developing efficient and reliable software.

Golang vs. C  : Performance and Speed ComparisonGolang vs. C : Performance and Speed ComparisonApr 21, 2025 am 12:13 AM

Golang is suitable for rapid development and concurrent scenarios, and C is suitable for scenarios where extreme performance and low-level control are required. 1) Golang improves performance through garbage collection and concurrency mechanisms, and is suitable for high-concurrency Web service development. 2) C achieves the ultimate performance through manual memory management and compiler optimization, and is suitable for embedded system development.

Is Golang Faster Than C  ? Exploring the LimitsIs Golang Faster Than C ? Exploring the LimitsApr 20, 2025 am 12:19 AM

Golang performs better in compilation time and concurrent processing, while C has more advantages in running speed and memory management. 1.Golang has fast compilation speed and is suitable for rapid development. 2.C runs fast and is suitable for performance-critical applications. 3. Golang is simple and efficient in concurrent processing, suitable for concurrent programming. 4.C Manual memory management provides higher performance, but increases development complexity.

Golang: From Web Services to System ProgrammingGolang: From Web Services to System ProgrammingApr 20, 2025 am 12:18 AM

Golang's application in web services and system programming is mainly reflected in its simplicity, efficiency and concurrency. 1) In web services, Golang supports the creation of high-performance web applications and APIs through powerful HTTP libraries and concurrent processing capabilities. 2) In system programming, Golang uses features close to hardware and compatibility with C language to be suitable for operating system development and embedded systems.

Golang vs. C  : Benchmarks and Real-World PerformanceGolang vs. C : Benchmarks and Real-World PerformanceApr 20, 2025 am 12:18 AM

Golang and C have their own advantages and disadvantages in performance comparison: 1. Golang is suitable for high concurrency and rapid development, but garbage collection may affect performance; 2.C provides higher performance and hardware control, but has high development complexity. When making a choice, you need to consider project requirements and team skills in a comprehensive way.

Golang vs. Python: A Comparative AnalysisGolang vs. Python: A Comparative AnalysisApr 20, 2025 am 12:17 AM

Golang is suitable for high-performance and concurrent programming scenarios, while Python is suitable for rapid development and data processing. 1.Golang emphasizes simplicity and efficiency, and is suitable for back-end services and microservices. 2. Python is known for its concise syntax and rich libraries, suitable for data science and machine learning.

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

mPDF

mPDF

mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

Safe Exam Browser

Safe Exam Browser

Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.

PhpStorm Mac version

PhpStorm Mac version

The latest (2018.2.1) professional PHP integrated development tool

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor