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Repeat an action x times

repeat(10) { i -> println("This line will be printed 10 times") println("We are on the ${i + 1}. loop iteration") }

Looping over iterables

You can loop over any iterable by using the standard for-loop: val list = listOf("Hello", "World", "!") for(str in list) { print(str) } Lots of things in Kotlin are iterable, like number ranges: for(i in 0..9) { print(i) } If you need an index while...

Break and continue

Break and continue keywords work like they do in other languages. while(true) { if(condition1) { continue // Will immediately start the next iteration, without executing the rest of the loop body } if(condition2) { break // Will exit the loop completely } } ...

Strategy

A strategy pattern can be used in Javascript in many cases to replace a switch statement. It is especially helpful when the number of conditions is dynamic or very large. It allows the code for each condition to be independent and separately testable. Strategy object is simple an object with multip...

Using Elements from the Polymer Catalog

Polymer prodives a lot of well built elements for you to use in your app. Browse them in their Element Catalog. Let's go through the workflow of using an element by including paper-input (Documentation) Download the Element To Download an element there are two ways: Bower The convinient way is...

Basic Element Structure

We got the following very basic element my-element saved as src/my-element.html <link rel="import" href="bower_components/polymer/polymer.html"> <dom-module id="my-element"> <template> <style> /* local styles go here */ ...

Example showcasing the basic concepts

The following example is an introduction to: Template compilation using underscore Accessing variables in a template Creating a view Rendering a view Showing a view <html> <head> <script src="https://code.jquery.com/jquery-3.1.0.min.js"></script> ...

Creating a Dialog with Tabbed Titlebar

Occasionally, we may want to display dialogs with more than one pane of content. jQuery UI offers tabs that can be used in tandem with a dialog to make this possible. While it may be more common to have tabs within a dialog's content container, this example will demonstrate how to make a list of t...

Generic algorithms

Higher-order functions can be used to implement generic algorithms, giving up the responsibility of providing final details to the user. For instance List.sort expects a comparison function, which allows to implement various ways of sorting. Here we implement case-insensitive sorting of strings: le...

Dispose system resources even when an exception is raised

Higher-order functions can be used to ensure that system resources are disposed, even when a treatment raises an exception. The pattern used by with_output_file allows a clean separation of concerns: the higher-order with_output_file functions takes care of managing the system resources bound to fi...

List.Map

List.map has the signature ('a -> 'b) -> 'a list -> 'b list which in English is a function that takes a function (we'll call this the mapping function) from one type (namely 'a) to another type (namely 'b) and a list of the first type. The function returns a list of the second type where ev...

File/Directory details

The ls command has several options that can be used together to show more information. Details/Rights The l option shows the file permissions, size, and last modified date. So if the root directory contained a dir called test and a file someFile the command: user@linux-computer:~$ ls -l Would ...

Changing default shell

Most modern distributions will come with BASH (Bourne Again SHell) pre-installed and configured as a default shell. The command (actually an executable binary, an ELF) that is responsible for changing shells in Linux is chsh (change shell). We can first check which shells are already installed and...

Hot and Cold Observables

Observables are broadly categorised as Hot or Cold, depending on their emission behaviour. A Cold Observable is one which starts emitting upon request(subscription), whereas a Hot Observable is one that emits regardless of subscriptions. Cold Observable /* Demonstration of a Cold Observable */ Ob...

Creating basic deadlocked system

A deadlock occurs when two competing actions wait for the other to finish, and thus neither ever does. In java there is one lock associated with each object. To avoid concurrent modification done by multiple threads on single object we can use synchronized keyword, but everything comes at a cost....

Using global external libraries without typings

Although modules are ideal, if the library you are using is referenced by a global variable (like $ or _), because it was loaded by a script tag, you can create an ambient declaration in order to refer to it: declare const _: any;

Creating a new project

Once you have Sails installed, just type $ sails new <project_name> This will create a skeleton Sails project in a new folder called <project_name>. You can also create a new project in an empty folder by typing $ sails new

role="alert"

A message with important, and usually time-sensitive, information. <div role="alert" aria-live="assertive">Your session will expire in 60 seconds.</div> Note that I've included both role="alert" and aria-live="assertive" at the same time. The...
HTML • ARIA

role="alertdialog"

A type of dialog that contains an alert message, where initial focus goes to an element within the dialog. <div role="alertdialog"> <h1>Warning</h1> <div role="alert">Your session will expire in 60 seconds.</div> </div>
HTML • ARIA

role="application"

A region declared as a web application, as opposed to a web document. In this example, the application is a simple calculator that might add two numbers together. <div role="application"> <h1>Calculator</h1> <input id="num1" type="text"> +...
HTML • ARIA

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