What's new in Golang Improvements in the language, compiler and tools

On August 13, 2024, the Go team released Golang 1.23, a version that brings important new features and improvements focused on efficiency, the compiler, and the language in general. Here I summarize the highlights of this update!

? Language Changes

? Iterators in for-range loops

For-range loops now support iterator functions with the following signatures:

• func(func() bool)
• func(func(K) bool)
• func(func(K, V) bool)

This makes it easier to iterate on custom collections and offers greater flexibility when working with your own data structures.

? Generic type aliases (experimental)

Preliminary support for generic type aliases is introduced. Although still experimental and must be enabled manually, this functionality promises to simplify the reuse of generic types as the language evolves.

?️ News in Tools

? Optional telemetry

Go 1.23 includes an optional telemetry system that collects usage and compiler crash statistics. This information will help the Go team improve future versions.

• Activation: go telemetry on
• More details: Telemetry documentation

?‍? New go command options

New options have been added to the go command that will make project management easier:

• go env -changed: Show only the changed environment variables.
• go mod tidy -diff: Display the necessary changes as a diff without modifying files.
• go list -m -json: Includes fields like Sum and GoModSum to manage dependencies.

⚡ Compiler and Performance Improvements

The compiler in Go 1.23 brings important optimizations:

• Local variable optimization: Memory usage has been reduced thanks to improvements in overlapping stack spaces.
• Profile Guided Optimization (PGO): Improve build time and overall efficiency in large projects.

These improvements not only speed up the development process, but also optimize the execution of applications in production.

? Runtime improvements

The timers (time.Timer and time.Ticker) have been optimized so that they are collected by the garbage collector more quickly when they lose references. This improves resource management and runtime efficiency.

? Updates to Standard Libraries

Several standard libraries receive improvements:

• crypto/x509: Now automatically fills the Certificate.Leaf field when loading key pairs, making it easier to use certificates.
• Improvements in go/types and os.

These updates are aimed at improving security, performance, and the development experience with Go.

?️ Compatibility and Platform Requirements

Go 1.23 maintains backward compatibility, but introduces minor changes to the requirements of some platforms:

• macOS: macOS 11 Big Sur or higher is required.
• Linux: It is the latest version compatible with kernel 2.6.32; Future versions will require at least kernel 3.2.

? Conclusion

Go version 1.23 reinforces the language's commitment to efficiency, flexibility, and performance. New features in the compiler, runtime, and tools ensure that Go remains a solid choice for developers around the world.

Update to Go 1.23 and try all these new features! ?

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