Exploring cmp.Or in Go 1.22: A New Function in the cmp Package

Discover the origin and practical applications of cmp.Or, a new function introduced in the cmp package of Go 1.22, with real-world code examples and a journey through its development.

Published 7 months ago on blog.carlana.net

Abstract

Go 1.22 introduces cmp.Or, a function that returns the first non-zero argument. It has various applications, such as finding the first non-blank string or creating multipart comparisons. The article delves into the history of its development back to 2016, discussing past proposals, optimizations, and the incorporation of generics. Despite some setbacks in making cmp.Or fully generic, the function remains a valuable addition to Go 1.22.

Results

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Discussion

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Relevance

This article is significant as it explores the inception and usage of cmp.Or in Go 1.22, highlighting its versatility in handling data comparisons. It sheds light on the evolution of generics in Go and the impact on efficient coding practices.

Applicability

If you use Go, you should consider integrating cmp.Or in your projects for streamlined comparison tasks. Utilize it to handle scenarios where you need to return the first non-zero value, especially in string evaluations or multipart comparisons.

Risks

One notable risk mentioned is the lack of short-circuit evaluation in cmp.Or, leading to redundant comparisons. Additionally, the article mentions a performance penalty when using generics with comparable types, so ensure to benchmark and optimize your code accordingly.

Conclusion

In the long term, the trend towards enhancing generics and efficient data handling in Go may impact your projects positively. Keeping abreast of such developments and optimizing your code with features like cmp.Or can lead to more concise and performant Go applications.

References

Further Informations and Sources related to this analysis. See also my Ethical Aggregation policy.

What’s New in Go 1.22: cmp.Or
The uses and history of a new function in the cmp package of Go 1.22.

Illustration of What’s New in Go 1.22: cmp.Or

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