dongzheng8463 2017-11-28 13:50
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将参数解析为布尔值或仅在switch语句中使用字符串

I'm coming across a few situations where I would like to use routing to change some Is_Active fields in my database but I'm curious about performance.

Let's have a route handler as so:

func testHandler(r *mux.Router) {
    r.HandleFunc("/test/{status}" statusHandler).Methods("GET")
}

Now that parameter will only ever be 0 or 1, unless the user tries something else but either way nothing will happen unless it's 0 or 1. My question is, is it faster to parse the string into a boolean which would involve bringing in the strconv package or would it be faster to just do a switch on the string?

Example of both:

func statusHandler(w http.ResponseWriter, r *http.Request) {
    v := mux.Vars(r)
    active, err := strconv.ParseBool(v["status"])
    // Handle err

    if active {
      // Do something
    } else {
      // Do something else
    }
}

or

func statusHandler(w http.ResponseWriter, r *http.Request) {
    v := mux.Vars(r)

    switch v["status"] {
        case "0":
            // Do something
        case "1":
            // Do something else
        default:
            // Throw 500 Error
    }
}
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  • dongzhong7299 2017-11-28 13:59
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    You could see the source code of ParseBool here. It uses switch too but with more cases. If the compiler inlines its code it, speed should be very similar to your code. If you want a definite answer you should benchmark different cases.

    In general I discourage you from paying attention to this small details. It's just matter of some nano seconds but it make your codes more difficult to understand. Begin optimizations with profiling your code to find hotspots that take a lot of time and fix them.

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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