Tutorial by Examples: id

// logger middlerware that logs time taken to process each request func Logger(h http.Handler) http.Handler { return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { startTime := time.Now() h.ServeHttp(w,r) endTime := time.Since(startTime) log...

func CORS(h http.Handler) http.Handler { return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { origin := r.Header.Get("Origin") w.Header().Set("Access-Control-Allow-Origin", origin) if r.Method == "OPTIONS" { ...

func Authenticate(h http.Handler) http.Handler { return CustomHandlerFunc(func(w *http.ResponseWriter, r *http.Request) { // extract params from req // post params | headers etc if CheckAuth(params) { log.Println("Auth Pass") // pas...

new Vue({ el:"#app", data:{ foo: "bar" }, methods:{ doSomethingAsynchronous(){ setTimeout(function(){ // This is wrong! Inside this function, // "this" refers to the window object. this.foo = "baz"; ...

new Vue({ el:"#star-wars-people", data:{ people: null }, mounted: function(){ $.getJSON("http://swapi.co/api/people/", function(data){ // Again, this is wrong! "this", here, refers to the window. this.people = data.results; }) ...

More information needed. A cryptographic hash function is a member of a class of functions with three vital properties; consistency, uniqueness, and irreversibility. Consistency: Given the same data, a hash function will always return the same value. That is, if X = Y, f(x) will always equal f(y) ...

navigator.mediaDevices is the common method adapted in Chrome and FF to getUserMedia as of now. A promised based call back which returns local stream on success navigator.mediaDevices.getUserMedia({ audio: true, video: true }) .then(stream => { // attach this stream to window obje...

The grid layout is a powerful layout with which you can do an horizontal and vertical layout a once. example: #include "mainwindow.h" #include <QApplication> #include <QMainWindow> #include <QWidget> #include <QVBoxLayout> #include <QPushButton> #inc...

With the help of West Wind's wwDotNetBridge, you can easily have access .NET code within a VFP program. The white paper has all the details, but this concise example will help illustrate the basic steps to running a method in a .NET assembly. Note that wwDotNetBridge can directly access simple pro...

Go will throw an error when there is a variable that is unused, in order to encourage you to write better code. However, there are some situations when you really don't need to use a value stored in a variable. In those cases, you use a "blank identifier" _ to assign and discard the assign...

Here follows a example of what can be done with nested StackViews, giving the user the impression of a continuous scrolling experience using complex user interface elements or alignments.

The big gotcha about scrolling is to determine the offset necessary to present (for instance) a Textfield inside a StackView with is inside the ScrollView. If you try to get the position of Textfield.frame.minY can be 0, because the minY frame is only considering the distance between the element an...

The MIDI Thru is simple and easy to test. When working properly you will be able to install your Arduino project between two MIDI devices, MIDI IN to MIDI OUT and you will be able to verify that the two device operate together. If you have the ability to measure latency, you will see an increase d...

Sometimes Android's logcat is running infinitely with errors coming from some process not own by you, draining battery or just making it hard to debug your code. A convenient way to fix the problem without restarting the device is to locate and kill the process causing the problem. From Logcat 03...

// This is a more complex MIDI THRU. This version uses a queue. Queues are important because some // MIDI messages can be interrupted for real time events. If you are generating your own messages, // you may need to stop your message to let a "real time" message through and then resum...

// This is a MiDI clk generator. This takes a #defined BPM and // makes the appropriate clk rate. The queue is used to let other messages // through, but allows a clock to go immediately to reduce clock jitter #define QUEUE_DEPTH 128 #define BPM 121 #define MIDI_SYSRT_CLK 0xF8 // clock...

In general, MIDI protocol is broken down into "messages". There are 4 general classes of messages: Channel Voice Channel Mode System Common System Real-Time Messages Messages start with a byte value above 0x80. Any value below 0x7F is considered data. Effectively meaning that 1...

Test Automation is broad topic. DEV/QA should delve on this questions first: What is nature of product? (Web, Mobile, Cloud, IOT, Analytics) What is development stage? (Developed-Legacy, In Development) What is technology stack? (Java, C#, Python, Ruby, Node, React) Is it SOA/Micro-services ba...

Just add these lines to the initialization RecyclerView mRecyclerView = (RecyclerView) view.findViewById(recyclerView); mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity())); mRecyclerView.addItemDecoration(new DividerItemDecoration(getActivity(), DividerItemDecoration.VERTICAL))...

To be able to run tests Chrome broser should be pre-installed on Android device,