How Fast Are Go's Type Assertions and Type Switches, Really?
Type Assertions and Type Switches in Go: Impact on Performance
Type introspection is a common technique for examining the runtime type of an object. However, concerns arise regarding its performance implications. In this article, we explore the speed of type assertions and type switches in Go, comparing them to other type checking methodologies.
Type Discovery Performance
In Go, type assertions and type switches provide a convenient way to identify object types at runtime. While it's known that these mechanisms can incur performance costs in languages like C/C , there's limited clarity on their impact in Go.
Benchmark Evaluation
To assess the performance of type assertions and type switches, we created a benchmark test script (available at http://play.golang.org/p/E9H_4K2J9-). The test compared four methods:
- Int Method: Direct method call on a known type.
- Interface: Method call through an interface.
- Type Switch: Type switch to identify the object type and call the appropriate method.
- Type Assertion: Type assertion to retrieve the underlying type and call the method.
Results and Analysis
The benchmark results indicate that all four methods have comparable speed:
-
Updated Results (Oct. 09, 2019):
- Int Method: 1.67 ns/op
- Interface: 2.03 ns/op
- Type Switch: 1.70 ns/op
- Type Assertion: 1.67 ns/op
-
Previous Results (Jan. 19, 2015):
- Int Method: 2.71 ns/op
- Interface: 2.98 ns/op
- Type Switch: 16.7 ns/op
- Type Assertion: 13.8 ns/op
Conclusion
Contrary to expectations, type assertions and type switches in Go have minimal performance impact compared to other type checking methods. This means that developers can use these techniques without significant concerns about runtime costs. Our benchmark tests demonstrate that all four methods have comparable speed, making them suitable for use in performance-critical applications.
The above is the detailed content of How Fast Are Go's Type Assertions and Type Switches, Really?. For more information, please follow other related articles on the PHP Chinese website!

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

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

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics

OpenSSL, as an open source library widely used in secure communications, provides encryption algorithms, keys and certificate management functions. However, there are some known security vulnerabilities in its historical version, some of which are extremely harmful. This article will focus on common vulnerabilities and response measures for OpenSSL in Debian systems. DebianOpenSSL known vulnerabilities: OpenSSL has experienced several serious vulnerabilities, such as: Heart Bleeding Vulnerability (CVE-2014-0160): This vulnerability affects OpenSSL 1.0.1 to 1.0.1f and 1.0.2 to 1.0.2 beta versions. An attacker can use this vulnerability to unauthorized read sensitive information on the server, including encryption keys, etc.

Backend learning path: The exploration journey from front-end to back-end As a back-end beginner who transforms from front-end development, you already have the foundation of nodejs,...

Under the BeegoORM framework, how to specify the database associated with the model? Many Beego projects require multiple databases to be operated simultaneously. When using Beego...

What should I do if the custom structure labels in GoLand are not displayed? When using GoLand for Go language development, many developers will encounter custom structure tags...

The library used for floating-point number operation in Go language introduces how to ensure the accuracy is...

Queue threading problem in Go crawler Colly explores the problem of using the Colly crawler library in Go language, developers often encounter problems with threads and request queues. �...

This article introduces how to configure MongoDB on Debian system to achieve automatic expansion. The main steps include setting up the MongoDB replica set and disk space monitoring. 1. MongoDB installation First, make sure that MongoDB is installed on the Debian system. Install using the following command: sudoaptupdatesudoaptinstall-ymongodb-org 2. Configuring MongoDB replica set MongoDB replica set ensures high availability and data redundancy, which is the basis for achieving automatic capacity expansion. Start MongoDB service: sudosystemctlstartmongodsudosys

The problem of using RedisStream to implement message queues in Go language is using Go language and Redis...
