What do you pay attention to when assessing the quality of programming code?

When assessing the quality of Go code, I pay attention to the following aspects:

• Readability and simplicity: the code should be understandable, without unnecessary complexity.
• Idiomaticity: use of standard patterns and Go style (gofmt, naming, error handling).
• Error handling: errors should be checked and handled correctly.
• Testability: presence of unit tests and the ability to easily cover the code with tests.
• Performance and resource efficiency: avoiding unnecessary allocations, efficient use of goroutines.
• Documentation: comments and documentation for public functions and packages.

An example of idiomatic error handling:

func ReadFile(path string) ([]byte, error) {
    data, err := os.ReadFile(path)
    if err != nil {
        return nil, err
    }
    return data, nil
}