How Do Go's Type Assertions and Type Switches Perform Compared to Other Type Checking Methods?

Type Assertions and Type Switches in Go: Performance Considerations

In Go, type assertions and type switches provide runtime type discovery mechanisms. However, concerns have been raised about their performance compared to methods like type member comparisons in C/C .

To assess their impact, a benchmark test was conducted to compare the speed of these methods:

The results on an AMD R7 2700X machine (Go v1.12.9) show that all methods have similar performance:

In contrast to previous results from 2015 on an amd64 machine, there is no significant slowdown observed when using type switches or assertions compared to direct method calls or interface access.

Overall, the performance of type assertions and switches has improved significantly in Go and is now comparable to other type checking methodologies. Therefore, you can utilize them in your code without concerns about substantial performance penalties.

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