Tutorial by Examples: l

Value constructors are functions that return a value of a data type. Because of this, just like any other function, they can take one or more parameters: data Foo = Bar String Int | Biz String Let's check the type of the Bar value constructor. :t Bar prints Bar :: String -> Int -> Foo...

This is the normal HTML table structure <style> table { width: 100%; } </style> <table> <tr> <td> I'm a table </td> </tr> </table> You can do same implementation like this <style> .table-...

Strict mode does not allow you to use duplicate function parameter names. function foo(bar, bar) {} // No error. bar is set to the final argument when called "use strict"; function foo(bar, bar) {}; // SyntaxError: duplicate formal argument bar

The simple answer, when asking how to use threads in Python is: "Don't. Use processes, instead." The multiprocessing module lets you create processes with similar syntax to creating threads, but I prefer using their convenient Pool object. Using the code that David Beazley first used to...

Cython is an alternative python interpreter. It uses the GIL, but lets you disable it. See their documentation As an example, using the code that David Beazley first used to show the dangers of threads against the GIL, we'll rewrite it using nogil: David Beazley's code that showed GIL threading ...

;Sends the keystroke for the letter "a" every 3 seconds. #Persistent SetTimer, SendLetterA, 3000 return SendLetterA() { Send, a }

This is an example of something that would have been straight up impossible with labels. If you execute the same label multiple times at the same time and they rely on variables that are being defined within them, they very likely interfere and cause unexpected behavior. Here is how to do it with f...

Consider the following example: type Company struct { Name string Location string } Hide/Skip Certain Fields To export Revenue and Sales, but hide them from encoding/decoding, use json:"-" or rename the variable to begin with a lowercase letter. Note that this prevents ...

By running the command stack install Stack will copy a executable file to the folder /Users/<yourusername>/.local/bin/

If we have this dictionary: set alpha {alice {items {}} bob {items {}} claudia {items {}} derek {items {}}} And want to add "fork" and "peanut" to Alice's items, this code won't work: dict lappend alpha alice items fork peanut dict get $alpha alice # => items {} items f...

There are two ways to register a background page in the extension manifest. The scripts property In the common case, a background page doesn't require any HTML markup. We can register these kinds of background pages using the scripts property. In this case, a background page will be generated...

The sort algorithm sorts a sequence defined by two iterators. This is enough to sort a built-in (also known as c-style) array. C++11 int arr1[] = {36, 24, 42, 60, 59}; // sort numbers in ascending order sort(std::begin(arr1), std::end(arr1)); // sort numbers in descending order sort(std::b...

In Swift, memory management is done for you automatically using Automatic Reference Counting. (See Memory Management) Allocation is the process of reserving a spot in memory for an object, and in Swift understanding the performance of such requires some understanding of the heap and the stack. The h...

The lists form a monad. They have a monad instantiation equivalent to this one: instance Monad [] where return x = [x] xs >>= f = concat (map f xs) We can use them to emulate non-determinism in our computations. When we use xs >>= f, the function f :: a -> [b...

defmodule ATest do use ExUnit.Case [{1, 2, 3}, {10, 20, 40}, {100, 200, 300}] |> Enum.each(fn {a, b, c} -> test "#{a} + #{b} = #{c}" do assert unquote(a) + unquote(b) = unquote(c) end end) end Output: . 1) test 10 + 20 = 40 (Test.Test) t...

The ASP.NET Core RTM release introduced BundlerMinifier.Core, a new Bundling and Minification tool that can be easily integrated into existing ASP.NET Core applications and doesn't require any external extensions or script files. Using BundlerMinifier.Core To use this tool, simply add a reference ...

If you need to add a property with a null value, you should use the predefined static final JSONObject.NULL and not the standard Java null reference. JSONObject.NULL is a sentinel value used to explicitly define a property with an empty value. JSONObject obj = new JSONObject(); obj.put("some...

While server side-code can run with elevated privileges, there is not an equivalent method to elevate privileges in client-side code (for obvious security reasons). As an alternative, you can specify credentials to emulate the access of a specific user or service account. To specify credentials, bu...

Check existing remote git remote -v # origin https://github.com/username/repo.git (fetch) # origin https://github.com/usernam/repo.git (push) Changing repository URL git remote set-url origin https://github.com/username/repo2.git # Change the 'origin' remote's URL Verify new remote URL ...

ESLint is a code style linter and formatter for your style guide much like JSHint. ESLint merged with JSCS in April of 2016. ESLint does take more effort to set up than JSHint, but there are clear instructions on their website for getting started. A sample configuration for ESLint is as follows: {...