Tutorial by Examples: en

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...

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 */ ...

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...

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...

A supporting section of the document, designed to be complementary to the main content at a similar level in the DOM hierarchy, but remains meaningful when separated from the main content. <div role="complementary"> <h2>More Articles</h2> <ul> <!-- ...

A large perceivable region that contains information about the parent document. <p role="contentinfo"> Author: Albert Einstein<br> Published: August 15, 1940 </p>

A region containing related information that is declared as document content, as opposed to a web application. <div role="document"> <h1>The Life of Albert Einstein</h1> <p>Lorem ipsum...</p> </div>

A type of widget that offers a list of choices to the user. <ul role="menu"> <li role="menuitem">New</li> <li role="menuitem">Open</li> <li role="menuitem">Save</li> <li role="menuitem">Clo...

A presentation of menu that usually remains visible and is usually presented horizontally. <ul role="menubar"> <li role="menuitem">File</li> <li role="menuitem">Edit</li> <li role="menuitem">View</li> <...

An option in a group of choices contained by a menu or menubar. <ul role="menubar"> <li role="menuitem">File</li> <li role="menuitem">Edit</li> <li role="menuitem">View</li> <li role="menuitem&quot...

A checkable menuitem that has three possible values: true, false, or mixed. <ul role="menu"> <li role="menuitem">Console</li> <li role="menuitem">Layout</li> <li role="menuitemcheckbox" aria-checked="true"&g...

A checkable menuitem in a group of menuitemradio roles, only one of which can be checked at a time. <ul role="menu"> <li role="menuitemradio" aria-checked="true">Left</li> <li role="menuitemradio" aria-checked="false">C...

An element whose implicit native role semantics will not be mapped to the accessibility API. <div style="float:left;">Some content on the left.</div> <div style="float:right;">Some content on the right</div> <div role="presentation" style=&...

import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.IOException; import java.nio.charset.StandardCharsets; import java.nio.file.Files; import java.nio.file.Paths; public class ReadingUTF8TextFile { public static void main(String[] args) throws IOException { ...

import java.nio.charset.StandardCharsets; import java.util.Arrays; public class GetUtf8BytesFromString { public static void main(String[] args) { String str = "Cyrillic symbol Ы"; //StandardCharsets is available since Java 1.7 //for ealier version use ...

When an expression contains multiple operators, it can potentially be read in different ways. For example, the mathematical expression 1 + 2 x 3 could be read in two ways: Add 1 and 2 and multiply the result by 3. This gives the answer 9. If we added parentheses, this would look like ( 1 + 2 )...

In general, it is considered good practice to throw by value (rather than by pointer), but catch by (const) reference. try { // throw new std::runtime_error("Error!"); // Don't do this! // This creates an exception object // on the heap and would require you to catch the ...

A simple context tree (containing some common values that might be request scoped and included in a context) built from Go code like the following: // Pseudo-Go ctx := context.WithValue( context.WithDeadline( context.WithValue(context.Background(), sidKey, sid), time.Now().A...

Matplotlib supports both object-oriented and imperative syntax for plotting. The imperative syntax is intentionally designed to be very close to Matlab syntax. The imperative syntax (sometimes called 'state-machine' syntax) issues a string of commands all of which act on the most recent figure or a...

When a React component is created, a number of functions are called: If you are using React.createClass (ES5), 5 user defined functions are called If you are using class Component extends React.Component (ES6), 3 user defined functions are called getDefaultProps() (ES5 only) This is the firs...