Tutorial by Examples: ha

You can also receive regular updates of the user's location; for example, as they move around while using a mobile device. Location tracking over time can be very sensitive, so be sure to explain to the user ahead of time why you're requesting this permission and how you'll use the data. if (naviga...

Under res folder, create a new folder called "anim" to store your animation resources and put this on that folder. shakeanimation.xml <?xml version="1.0" encoding="utf-8"?> <rotate xmlns:android="http://schemas.android.com/apk/res/android" and...

A char is single letter stored inside a variable. It is built-in value type which takes two bytes of memory space. It represents System.Char data type found in mscorlib.dll which is implicitly referenced by every C# project when you create them. There are multiple ways to do this. char c = 'c'; ...

XML elements often nest, have data in attributes and/or as character data. The way to capture this data is by using ,attr and ,chardata respectively for those cases. var doc = ` <parent> <child1 attr1="attribute one"/> <child2>and some cdata</child2> </p...

Inline style You can manipulate the inline CSS style of an HTML element by simply reading or editing its style property. Assume the following element: <div id="element_id" style="color:blue;width:200px;">abc</div> With this JavaScript applied: var element = doc...

The web.config system.web.httpRuntime must target 4.5 to ensure the thread will renter the request context before resuming your async method. <httpRuntime targetFramework="4.5" /> Async and await have undefined behavior on ASP.NET prior to 4.5. Async / await will resume on an arb...

If you want two or more arguments to be mutually exclusive. You can use the function argparse.ArgumentParser.add_mutually_exclusive_group(). In the example below, either foo or bar can exist but not both at the same time. import argparse parser = argparse.ArgumentParser() group = parser.add_mut...

To modify an existing column in Rails with a migration, run the following command: rails g migration change_column_in_table This will create a new migration file in db/migration directory (if it doesn’t exist already), which will contain the file prefixed with timestamp and migration file name w...

# load the library library(ggplot2) # create a blank canvas g <- ggplot(data = diamonds) g + geom_bar(aes(x = cut, fill = cut)) + scale_fill_discrete(guide = guide_legend(title = "CUT", keywidth = 2, ...

When Flash makes a request for data from an external source, that operation is asynchronous. The most basic explanation of what this means is that the data loads "in the background" and triggers the event handler you allocate to Event.COMPLETE when it is received. This can happen at any po...

If you need to roll for a true or false in an "x% chance" situation, use: function roll(chance:Number):Boolean { return Math.random() >= chance; } Used like: var success:Boolean = roll(0.5); // True 50% of the time. var again:Boolean = roll(0.25); // True 25% of the time. ...

To display the hunks that are staged for commit: git diff --cached

2.2 func removeCharactersNotInSetFromText(text: String, set: Set<Character>) -> String { return String(text.characters.filter { set.contains( $0) }) } let text = "Swift 3.0 Come Out" var chars = Set([Character]("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLKMNOPQRSTUVWXYZ&...

var alphabet:Vector.<String> = new <String>[ "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", &q...

This method will work on modern versions of Arch, CentOS, CoreOS, Debian, Fedora, Mageia, openSUSE, Red Hat Enterprise Linux, SUSE Linux Enterprise Server, Ubuntu, and others. This wide applicability makes it an ideal as a first approach, with fallback to other methods if you need to also identify o...

This example will show you how to quickly get a hello world Aurelia application up and running using the Aurelia CLI. Prerequisites The Aurelia CLI is a Node.js based application, so make sure you install it first before proceeding. You will need Node.js 4.4.7 or later. You will also need a Git c...

A Value Converter can be used alongside other value converters and you can infinitely chain them using the | pipe separator. ${myString | toUppercase | removeCharacters:'&,%,-,+' | limitTo:25} The above theoretical example firstly applies toUppercase which capitalizes our string. Then it app...

Recursion occurs when a function call causes that same function to be called again before the original function call terminates. For example, consider the well-known mathematical expression x! (i.e. the factorial operation). The factorial operation is defined for all nonnegative integers as follows:...

When running from the CLI, PHP exhibits some different behaviours than when run from a web server. These differences should be kept in mind, especially in the case where the same script might be run from both environments. No directory change When running a script from a web server, the current w...

For Addition "4" + 2 # Gives "42" 4 + "2" # Gives 6 1,2,3 + "Hello" # Gives 1,2,3,"Hello" "Hello" + 1,2,3 # Gives "Hello1 2 3" For Multiplication "3" * 2 # Gives "33" 2 * "3&quot...