Tutorial by Examples: for

Do not allocate new objects in onDraw @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); Paint paint = new Paint(); //Do not allocate here } Instead of drawing drawables in canvas... drawable.setBounds(boundsRect); drawable.draw(canvas); Use a B...

HTML: <div class="wrapper"> <div class="centered"> centered </div> </div> CSS: .wrapper { position: relative; height: 600px; } .centered { position: absolute; z-index: 999; transform: translate(-50%, -50%); top:...

git clean -f Will remove all untracked files.

:q! ZQ

:wq!

To build up an expression like _ => _.Field == "VALUE" at runtime. Given a predicate _ => _.Field and a string value "VALUE", create an expression that tests whether or not the predicate is true. The expression is suitable for: IQueryable<T>, IEnumerable<T>...

foreach is unusual among the collections iterators in that it does not return a result. Instead it applies a function to each element that has only side effects. For example: scala> val x = List(1,2,3) x: List[Int] = List(1, 2, 3) scala> x.foreach { println } 1 2 3 The function sup...

Prior to Json.NET 4.5 dates were written using the Microsoft format: "/Date(1198908717056)/". If your server sends date in this format you can use the below code to serialize it to NSDate: Objective-C (NSDate*) getDateFromJSON:(NSString *)dateString { // Expect date in this format ...

Often we wish to convert, or transform the contents of a collection (a list, or something traversable). In Haskell we use map: -- Simple add 1 map (+ 1) [1,2,3] [2,3,4] map odd [1,2,3] [True,False,True] data Gender = Male | Female deriving Show data Person = Person String Gender ...

Description: Evaluate expression after user's confirmation. Arguments: ng-confirm-click:(expression) Expression to evaluate when confirmed. ng-confirm-message:(template) Message to be shown in confirm dialog. Code: Directives.directive("ngConfirmClick", ["$parse","...

Apply the transformation to non-collection entries, delving into nested collections too and preserving the whole structure. def lst = ['foo', 'bar', ['inner_foo', 'inner_bar']] lst.collectNested { it.toUpperCase() } // [FOO, BAR, [INNER_FOO, INNER_BAR]]

A relation(or relation schema) in a given database is in first normal form, if the domain of all attributes of that relation is atomic. A domain is atomic if all the elements of that domain are considered to indivisible units. Suppose a relation employee, has attribute name, then the relation is not...

To normalize the database in the second form, there must not be any partial dependency of any column on primary key. Let's consider the following example: idnamedobsubject1Mark1-1-1981Physics2Jack2-2-1982Math2Jack2-2-1982Biology3John3-3-1983Math This table is considered to have a composite primar...

The using of net.sf.jasperreports.export.xls.auto.filter property allow to add autofilter in generated xls file. <columnHeader> <band height="30" splitType="Stretch"> <staticText> <reportElement x="0" y="0" widt...

$hash = @{ city = 'Berlin' } $result = 'You should really visit {0}' -f $hash.city Write-Host $result #prints "You should really visit Berlin" Format strings can be used with the -f operator or the static [String]::Format(string format, args) .NET method.

Information about the database connections SELECT a.mon$attachment_id as Attachment_ID, a.mon$server_pid as Server_PID, case a.mon$state when 1 then 'active' when 0 then 'idle' end as State, a.mon$attachment_name as Database_Name, ...

Darken #demo { @refcolor: #f0b9b8; background: @refcolor; border: 1px solid darken(@refcolor, 25%); } The above code makes use of the darken() function to set the border color as a shade that is 25% darker than the reference color (which is also the background color). Less compiler ca...

In order to execute a block of code over an over again, loops comes into the picture. The for loop is to be used when a block of code is to executed a fixed number of times. For example, in order to fill an array of size n with the user inputs, we need to execute scanf() for n times. C99 #include...

If we have a Model as following, from django.db import models from django.contrib.auth.models import User class UserModuleProfile(models.Model): user = models.OneToOneField(User) expired = models.DateTimeField() admin = models.BooleanField(default=False) employee_id = models...

Partial classes provide a clean way to separate core logic of your scripts from platform specific methods. Partial classes and methods are marked with the keyword partial. This signals the compiler to leave the class "open" and look in other files for the rest of the implementation. // E...