Tutorial by Examples: ch

// Get the battery API navigator.getBattery().then(function(battery) { if (battery.charging) { console.log("Battery is charging"); } else { console.log("Battery is discharging"); } });

// Get the battery API navigator.getBattery().then(function(battery) { console.log( "Battery will get fully charged in ", battery.chargingTime, " seconds" ); });

Send a 304 Not Modified response status from the server send in response to a client request that contains headers If-Modified-Since and If-None-Match, if the request resource hasn’t changed. For example if a client request for a web page includes the header If-Modified-Since: Fri, 22 Jul 2016 14:3...

Vim's standard search commands are / for forward search and ? for backward search. To start a search from normal mode: press /, type your pattern, press <CR> to perform the search. Examples: /foobar<CR> search forward for foobar ?foo\/bar<CR> search backward for ...

In normal mode, move the cursor to any word then press * to search forwards for the next occurrence of the word under the cursor, or press # to search backwards. * or # search for the exact word under the cursor: searching for big would only find big and not bigger. Under the hood, Vim uses a sim...

if we want to change the Controllers directory we need: Move and/or rename the default Controllers directory where we want it. For example from app/Http/Controllers to app/Controllers Update all the namespaces of the files inside the Controllers folder, making they adhere to the new path, re...

Similar to repeaters used in other languages. This binding will allow you to replicate a block of html for each item in an array. <div data-bind="foreach:contacts"> <div class="contact"> <h2 data-bind="text:name"> <p data-bin...

Case classes provide a copy method that creates a new object that shares the same fields as the old one, with certain changes. We can use this feature to create a new object from a previous one that has some of the same characteristics. This simple case class to demonstrates this feature: case cla...

Any ASCII editor can edit batch files. A list of editors that can syntax highlight batch syntax can be found here. You can also use the default notepad shipped with windows to edit and view a batch file, although it does not offer syntax highlighting. To open notepad: Press Win 𐌎+R, type notepa...

Cache-Control: public, max-age=31536000 public means the response is the same for all users (it does not contain any personalized information). max-age is in seconds from now. 31536000 = 60 * 60 * 24 * 365. This is recommended for static assets that are never meant to change.

Cache-Control: private, max-age=60 private specifies that the response can be cached only for user who requested the resource, and can't be reused when other users request the same resource. This is appropriate for responses that depend on cookies.

Cache-Control: no-cache The client will behave as if the response was not cached. This is appropriate for resources that can unpredictably change at any time, and which users must always see in the latest version. Responses with no-cache will be slower (high latency) due to need to contact the s...

With the ~ selector, you can easily implement a global accessible boolean without using JavaScript. Add boolean as a checkbox To the very beginning of your document, add as much booleans as you want with a unique id and the hidden attribute set: <input type="checkbox" id="sideba...

An existing working copy can be quickly transformed to reflect the contents of a different branch in the same repository. For example, you might have a working copy of the trunk and now need to work on a development branch. Instead of checking out a completely new working copy (which can waste a l...

#include <vector> #include <string> #include "agent_util.hpp" //this file can be found in Java SE Development Kit 8u101 Demos and Samples //see http://download.oracle.com/otn-pub/java/jdk/8u101-b13-demos/jdk-8u101-windows-x64-demos.zip //jdk1.8.0_101.zip!\demo\jvmti\v...

A patch is a file that show the differences between two revisions or between your local repository and the last revision your repository is pointing. To share or save a patch of your local uncommitted changes either for peer review or to apply later, do: svn diff > new-feature.patch To get a...

If you have a foreach loop that you want to speed up and you don't mind what order the output is in, you can convert it to a parallel foreach loop by doing the following: using System; using System.Threading; using System.Threading.Tasks; public class MainClass { public static void Main...

Given a file using ; as a column delimiter. Permuting the first and the second column is accomplished by awk -F';' -v 'OFS=;' '{ swap = $2; $2 = $1; $1 = swap; print }'

To change PS1, you just have to change the value of PS1 shell variable. The value can be set in ~/.bashrc or /etc/bashrc file, depending on the distro. PS1 can be changed to any plain text like: PS1="hello " Besides the plain text, a number of backslash-escaped special characters are s...

Matlab supports synchronous and asynchronous communication with a serial port. It is important to chose the right communication mode. The choice will depend on: how the instrument you are communicating with behave. what other functions your main program (or GUI) will have to do aside from managi...