Tutorial by Examples: in

In functions, you can define a number of mandatory arguments: def fun1(arg1, arg2, arg3): return (arg1,arg2,arg3) which will make the function callable only when the three arguments are given: fun1(1, 2, 3) and you can define the arguments as optional, by using default values: def fun...
When you want to create a function that can accept any number of arguments, and not enforce the position or the name of the argument at "compile" time, it's possible and here's how: def fun1(*args, **kwargs): print(args, kwargs) The *args and **kwargs parameters are special parame...
let fetchRequest = NSFetchRequest(entityName: "Foo") var thePredicate: NSPredicate? thePredicate = NSPredicate(format: "message == 'example'") The entity Foo has a message string attribute
Since Laravel version 5.2.31 the web middleware is applied by default within the RouteServiceProvider (https://github.com/laravel/laravel/commit/5c30c98db96459b4cc878d085490e4677b0b67ed) In app/Providers/RouteServiceProvider.php you will find the following functions which apply the middleware on ev...
A common issue that users of Eclipse encounter is related to the default system JVM. A typical situation is a 64 bit Windows which has both 32 and 64 bit versions of Java installed, and a 32 bit Eclipse. If the 64 bit version of Java is the system default, when Eclipse is launched an error dialog i...
$ gunzip -c input.fastq.gz | paste - - - - | head @IL31_4368:1:1:996:8507/2 TCCCTTACCCCCAAGCTCCATACCCTCCTAATGCCCACACCTCTTACCTTAGGA + FFCEFFFEEFFFFFFFEFFEFFFEFCFC<EEFEFFFCEFF<;EEFF=FEE?FCE @IL31_4368:1:1:996:21421/2 CAAAAACTTTCACTTTACCTGCCGGGTTTCCCAGTTTACATTCCACTGTTTGAC + ...
$ gunzip -c input.fastq.gz | awk '{printf("%s%s",$0,((NR+1)%4==1?"\n":"\t"));}' | head @IL31_4368:1:1:996:8507/2 TCCCTTACCCCCAAGCTCCATACCCTCCTAATGCCCACACCTCTTACCTTAGGA + FFCEFFFEEFFFFFFFEFFEFFFEFCFC<EEFEFFFCEFF<;EEFF=FEE?FCE @IL31_4368:1:1:996:21421/2...
To open a new window, add the following code somewhere where you can keep a reference to the new window (I.E., the app delegate). Swift let storyboard:NSStoryboard = NSStoryboard(name: "Main", bundle: nil) guard let controller:NSWindowController = storyboard.instantiateControllerWithIde...
The target attribute specifies a name or a keyword that indicates where to display the response that is received after submitting the form. The target attribute defines a name of, or keyword for, a browsing context (e.g. tab, window, or inline frame). From Tag with a target attribute: <form ta...
To print the directory stack, use the command pushd without any parameters: @echo off cd C:\example\ pushd one pushd ..\two pushd ..\.. pushd echo Current Directory: %cd% echo: popd pushd three pushd echo Current Directory: %cd% Output: C:\example\two ...
private final OkHttpClient client = new OkHttpClient(); public void run() throws Exception { RequestBody formBody = new FormBody.Builder() .add("search", "Jurassic Park") .build(); Request request = new Request.Builder() .url("https:...
private static final String IMGUR_CLIENT_ID = "..."; private static final MediaType MEDIA_TYPE_PNG = MediaType.parse("image/png"); private final OkHttpClient client = new OkHttpClient(); public void run() throws Exception { // Use the imgur image upload API as ...
Grab via Maven: <dependency> <groupId>com.squareup.okhttp3</groupId> <artifactId>okhttp</artifactId> <version>3.6.0</version> </dependency> or Gradle: compile 'com.squareup.okhttp3:okhttp:3.6.0'
with Ada.Text_IO; procedure Main is type Fruit is (Banana, Orange, Pear); X : Fruit := Orange; begin Ada.Text_IO.Put_Line (Fruit'Image (X)); end Main; Result ORANGE
with Ada.Text_IO; procedure Main is X : Integer := 17; begin Ada.Text_IO.Put_Line (Integer'Image (X)); end Main; Result 17
with Ada.Text_IO; procedure Main is X : Float := 2.71; begin Ada.Text_IO.Put_Line (Float'Image (X)); end Main; Result 2.71000E+00
If a static constructor throws an exception, it is never retried. The type is unusable for the lifetime of the AppDomain. Any further usages of the type will raise a TypeInitializationException wrapped around the original exception. public class Animal { static Animal() { Consol...
This is a huge topic, but it is also the most important "performance" issue. The main lesson for a novice is to learn of "composite" indexes. Here's a quick example: INDEX(last_name, first_name) is excellent for these: WHERE last_name = '...' WHERE first_name = '...' AND ...
x IN ( SELECT ... ) turn into a JOIN When possible, avoid OR. Do not 'hide' an indexed column in a function, such as WHERE DATE(x) = ...; reformulate as WHERE x = ... You can generally avoid WHERE LCASE(name1) = LCASE(name2) by having a suitable collation. Do no use OFFSET for "paginatio...
Detailed instructions on getting material-design set up or installed.

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