Tutorial by Examples: io

Probably the two most popular free implementations of Common Lisp are Clozure Common Lisp (CCL) and Steel Bank Common Lisp (SBCL). They are both available for a variety of platforms including Linux on x86-64 and Linux on ARM. CCL: http://ccl.clozure.com/download.html SBCL: http://www.sbcl.org/gett...

Constraint created as NSLayoutConstraint(item: myView, attribute: NSLayoutAttribute.Leading, relatedBy: NSLayoutRelation.Equal, toItem: view, attribute: NSLayoutAttribute.LeadingMargin, multiplier: 1.0, constant: 20.0) or, from math point of view: view.attribute * multiplier + constant ...

Anonymous functions can be used for functional programming. The main problem to solve is that there is no native way for anchoring a recursion, but this can still be implemented in a single line: if_ = @(bool, tf) tf{2-bool}(); This function accepts a boolean value and a cell array of two functi...

There are two PyCharm editions: Community and Professional. Both are downloadable from JetBrains website. Additionally, there is another edition, PyCharm Edu. JetBrains recommend this edition, if you are learning or teaching Programming with Python. The supported platforms are Windows, Linux and m...

Microsoft Access has existed since 1992, and older versions continue to see regular use when business-critical database applications have been built on them. A very comprehensive resource summarizing the release history (with links to release notes, where available) is: Microsoft Access Version...

A common thought pattern for inexperienced Java programmers is that exceptions are "a problem" or "a burden" and the best way to deal with this is catch them all1 as soon as possible. This leads to code like this: .... try { InputStream is = new FileInputStream(fileName);...

To search for text foo within a {} block surrounding the cursor use the following command (<ESC> - escape key, <CR> - enter key) : vi{<ESC>/\%Vfoo<CR> now you can jump between the matches within the block by pressing n and p. If you have hlsearch option enabled this will ...

Detailed instructions on getting datepicker set up or installed.

A function is similar in look to a mixin but it doesn't add any styles, it only returns a value. Functions should be used to prevent repeated logic in your styles. Sass has some built-in functions that are called using the standard CSS function syntax. h1 { background: hsl(0, 25%, 50%); } ...

You can define central config info's in a separate gradle include file Centralizing dependencies via "dependencies.gradle" file a stand alone properties file Versioning your builds via "version.properties" file or do it with root gradle.properties file the project structu...

In some circumstances (for example obtaining a Google API key) you need to find your keystore fingerprint. Gradle has a convenient task that display all the signing information, including keystore fingerprints: ./gradlew signingReport This is a sample output: :app:signingReport Variant: releas...

X-Macros can be used for code generation, by writing repetitive code: iterate over a list to do some tasks, or to declare a set of constants, objects or functions. Here we use X-macros to declare an enum containing 4 commands and a map of their names as strings Then we can print the string values ...

Installation Volley JCenter Gradle Import //in your project's app level build.gradle compile 'com.android.volley:volley:1.0.0' Create a subclass of Application public class AppController extends Application { public static final String TAG = AppController.class .getSimpleN...

Shows the version of bash that is running, this allows you to decide whether you can use any advanced features: ~> $ echo $BASH_VERSION 4.1.2(1)-release

Consider this example function to check if a host is up: is_alive() { ping -c1 "$1" &> /dev/null } This function sends a single ping to the host specified by the first function parameter. The output and error output of ping are both redirected to /dev/null, so the functi...

Detailed instructions on getting google-bigquery set up or installed.

The class use Phalcon\Validation\Validator; use Phalcon\Validation\ValidatorInterface; use Phalcon\Validation\Message; class RecaptchaValidator extends Validator implements ValidatorInterface { public function validate(\Phalcon\Validation $validation, $attribute) { $value =...

Things you need A paid Apple Developer Program Membership A valid App ID and identifier for you app (like com.example.MyApp) which is not used before anywhere Access to developer.apple.com and Member Center An iOS Device to test (as Push Notifications don't work on Simulator) Enabling t...

In order to use Gson you have to include it in your project. You can do this by adding the following dependency of the Gson version available in Maven Central: Maven Add to pom.xml <dependencies> <dependency> <groupId>com.google.code.gson</groupId> <a...

There're several conventions of calling functions, specifying who (caller or callee) pops arguments from the stack, how arguments are passed and in what order. C++ uses Cdecl calling convention by default, but C# expects StdCall, which is usually used by Windows API. You need to change one or the ot...