How do I extract URL parameters in Go without using a library?

URL Parameter Mapping in Go

In Go, while there isn't a built-in mechanism for direct mapping of URL parameters, it's possible to implement it manually. Here's how:

Manual Approach:

To manually extract data from a URL, you can split the URL path into parts and analyze them individually. Here's an example function that accomplishes this:

func getCode(r *http.Request, defaultCode int) (int, string) {
    p := strings.Split(r.URL.Path, "/")
    if len(p) == 1 {
        return defaultCode, p[0]
    } else if len(p) > 1 {
        code, err := strconv.Atoi(p[0])
        if err == nil {
            return code, p[1]
        } else {
            return defaultCode, p[1]
        }
    } else {
        return defaultCode, ""
    }
}

Example Usage:

This function can be used within a request handler:

func handler(w http.ResponseWriter, r *http.Request) {
    code, param := getCode(r, 0)
    // ... do something with the extracted code and param ...
}

Note: This approach involves manual parsing and analysis of the URL, which can be more work than using a pre-built library. However, it provides a basic understanding of how to extract parameters in Go natively.

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