Prefer standard library functions

When implementing algorithms, prioritize using standard library functions over manual implementations when they provide equivalent or better performance. The standard library is typically optimized and well-tested, making it a more reliable choice for common operations.

For example, instead of manually copying map entries:

// Avoid manual iteration
for k, v := range m {
    c[k] = v
}

// Prefer standard library function
maps.Copy(c, m)

Similarly, for string operations, the standard library is often more efficient:

// Use strings.ToLower() instead of custom utilities
origin := strings.ToLower(c.Get(fiber.HeaderOrigin))

This approach reduces code complexity, leverages optimized implementations, and improves maintainability. The standard library functions are particularly efficient when input data is already in the expected format, as noted: “standard lib is faster if it is already lower case, which should be the case in most cases.”