Tutorial by Examples: b

The ls command's -S option sorts the files in descending order of file size. $ ls -l -S ./Fruits total 444 -rw-rw-rw- 1 root root 295303 Jul 28 19:19 apples.jpg -rw-rw-rw- 1 root root 102283 Jul 28 19:19 kiwis.jpg -rw-rw-rw- 1 root root 50197 Jul 28 19:19 bananas.jpg When used with the -r o...

Go supports pointers, allowing you to pass references to values and records within your program. package main import "fmt" // We'll show how pointers work in contrast to values with // 2 functions: `zeroval` and `zeroptr`. `zeroval` has an // `int` parameter, so arguments will be ...

public IEnumerable<int> F1() { for (int i = 0; i < 3; i++) yield return i; //return F2(); // Compile Error!! foreach (var element in F2()) yield return element; } public int[] F2() { return new[] { 3, 4, 5 }; }

What’s a component? A component is basically a directive that uses a simpler configuration and that is suitable for a component-based architecture, which is what Angular 2 is all about. Think of a component as a widget: A piece of HTML code that you can reuse in several different places in y...

The standard ADB configuration involves a USB connection to a physical device. If you prefer, you can switch over to TCP/IP mode, and connect ADB via WiFi instead. Not rooted device Get on the same network: Make sure your device and your computer are on the same network. Connect the...

Array.isArray(obj) returns true if the object is an Array, otherwise false. Array.isArray([]) // true Array.isArray([1, 2, 3]) // true Array.isArray({}) // false Array.isArray(1) // false In most cases you can instanceof to check if an object is an Array. []...

Tensorflow is more than just a deep learning framework. It is a general computation framework to perform general mathematical operations in a parallel and distributed manner. An example of such is described below. Linear Regression A basic statistical example that is commonly utilized and is r...

Variadic Arguments

Implementations in classes, including abstract declarations, take precedence over all interface defaults. Abstract class method takes precedence over Interface Default Method. public interface Swim { default void backStroke() { System.out.println("Swim.backStroke"); ...

Macros return code. Since code in Lisp consists of lists, one can use the regular list manipulation functions to generate it. ;; A pointless macro (defmacro echo (form) (list 'progn (list 'format t "Form: ~a~%" (list 'quote form)) form)) This is often very hard to...

The expansion of a macro often needs to use symbols that weren't passed as arguments by the user (as names for local variables, for example). One must make sure that such symbols cannot conflict with a symbol that the user is using in the surrounding code. This is usually achieved by using GENSYM, ...

json.Marshal from the package "encoding/json" encodes a value to JSON. The parameter is the value to encode. The returned values are an array of bytes representing the JSON-encoded input (on success), and an error (on failure). decodedValue := []string{"foo", "bar"} ...

json.Unmarshal from the package "encoding/json" decodes a JSON value into the value pointed by the given variable. The parameters are the value to decode in []bytes and a variable to use as a storage for the de-serialized value. The returned value is an error (on failure). encodedValue :...

Given some default routing such as {controller=Home}/{action=Index}/{id?} if you had the url https://stackoverflow.com/questions/1558902 This would go to the QuestionsController and the value 1558902 would be mapped to an id parameter of an index action, i.e. public ActionResult Index(int? id){ ...

To extend on the route binding say you had a url like https://stackoverflow.com/questions/1558902?sort=desc and routing like {controller=Home}/{action=Index}/{id?} public ActionResult Index(int? id, string sort){ //sort would bind to the value in the query string, i.e. "desc" } ...

Often you'd be working with viewmodel classes in asp.net-mvc and would want to bind to properties on these. This works similar to mapping to individual parameters. Say you had a simple view model call PostViewModel like this public class PostViewModel{ public int Id {get;set;} public int Sn...

These are form values that go in the HTTP request using the POST method. (including jQuery POST requests). Say you did an ajax post like $.ajax({ type: 'POST', url: window.updatePost, data: { id: 21, title: 'snappy title' }, //kept short for clarity }); Here the two values...

The break statement ends a loop (like for, while) or the evaluation of a switch statement. Loop: while(true) { if(someCondition == 5) { break; } } The loop in the example would run forever. But when someCondition equals 5 at some point of execution, then the loop ends. If mult...

git diff 1234abc..6789def # old new E.g.: Show the changes made in the last 3 commits: git diff @~3..@ # HEAD -3 HEAD Note: the two dots (..) is optional, but adds clarity. This will show the textual difference between the commits, regardless of where they are in the tree.

The Premain class will contain the method "premain(String agentArgs Instrumentation inst)" Here is an example: import java.lang.instrument.Instrumentation; public class PremainExample { public static void premain(String agentArgs, Instrumentation inst) { System.out.print...