Tutorial by Examples: e

In pass by value of parameter passing to a method, actual parameter value is copied to formal parameter value. So actual parameter value will not change after returning from called function. @interface SwapClass : NSObject -(void) swap:(NSInteger)num1 andNum2:(NSInteger)num2; @end @impleme...

In pass by reference of parameter passing to a method, address of actual parameter is passed to formal parameter. So actual parameter value will be changed after returning from called function. @interface SwapClass : NSObject -(void) swap:(int)num1 andNum2:(int)num2; @end @implementation S...

The example Checking a string for unwanted characters, describes how to test and reject strings that don't meet certain criteria. Obviously, rejecting input outright is not always possible, and sometimes you just have to make do with what you receive. In these cases, a cautious developer will attemp...

In this example we are going to create a directive to copy a text into the clipboard by clicking on an element copy-text.directive.ts import { Directive, Input, HostListener } from "@angular/core"; @Directive({ selector: '[text-copy]' }) export class TextCopyDir...

Launch debug by clicking on the "beetle" icon: Debug window is now waiting instructions for next step: You can go to the next step by clicking F9 in the debug window or by clicking on the green arrow:

The input element with a type attribute whose value is "datetime" represents a control for setting the element’s value to a string representing a global date and time (with timezone information). <fieldset> <p><label>Meeting time: <input type=datetime name="m...

For now I think the catalog module contains almost everything you can add to a module. Api - Contains the service contracts. A set of interfaces that should not be changed unless the minor version changes. Not mandatory for a custom module but nice to have for comercial extensions. Data - Data...

Once a CMake project is initialized via project(), the output verbosity of the resulting build script can be adjusted via: CMAKE_VERBOSE_MAKEFILE This variable can be set via CMake's command line when configuring a project: cmake -DCMAKE_VERBOSE_MAKEFILE=ON <PATH_TO_PROJECT_ROOT> For G...

While Python has an assert statement, the Python unit testing framework has better assertions specialized for tests: they are more informative on failures, and do not depend on the execution's debug mode. Perhaps the simplest assertion is assertTrue, which can be used like this: import unittest ...

GNU Emacs uses a special format for documentation: info. The Common Lisp standard has been converted to the Texinfo format, which can be used to create documentation browsable with the info reader in GNU Emacs. See here: dpans2texi.el converts the TeX sources of the draft ANSI Common Lisp standard...

While being better in many regards, the new connection syntax in Qt5 has one big weakness: Connecting overloaded signals and slots. In order to let the compiler resolve the overloads we need to use static_casts to member function pointers, or (starting in Qt 5.7) qOverload and friends: #include &lt...

A role in Perl is essentially a set of methods and attributes which injected into a class directly. A role provides a piece of functionality which can be composed into (or applied to) any class (which is said to consume the role). A role cannot be inherited but may be consumed by another rol...

<svg width="800px" height="600px" > <defs> <filter id="posterize" color-interpolation-filters="sRGB"> <feComponentTransfer> <feFuncR type="discrete" tableValues="0 0.25 0.75 1.0"/> ...

This filter selects only the high luminance areas of a source graphic, blurs the contents and composites the blurred content on top of the original. <svg width="800px" height="600px"> <defs> <filter id="highlightblur" color-interpolation-fi...

This is an example of an end marker specified with a minimal number of parameters. Note that the stroke color of the original element is not inherited by the marker. <svg width="800px" height="600px"> <defs> <marker id="examplemarker" vi...

The axis offsets for drawing the marker that are specified by refX and refY are applied before the rotation specified by the orient parameter. Below you can see the effects of various combinations of orient and refX, refY to illustrate this. <svg width="800px" height="600px"&...

The default for drawing markers is to use the stroke width of the calling element, but you can explicitly specify that markers be drawn using the unit system for the element the marker is being applied to by specifying markerUnits="userSpaceOnUse". Markers are drawn into a 3x3 markerUnits ...

Elements can specify start, mid and end markers separately. Below are examples of start, mid and end markers for all elements that can be marked. Please note that Chrome does not currently (July 2016) calculate auto orientation correctly for start and end markers for polygons (bug# 633012), and also...

PendingIntent pendingIntent = PendingIntent.getActivity(context, uniqueIntentId, intent, PendingIntent.FLAG_CANCEL_CURRENT); final RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.remote_view_notification); remoteViews.setImageViewResource(R.id.remote...

<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" xmlns:xlink="http://www.w3.org/1999/xlink"> <defs> <clipPath id="circleClip"> <circle cx="50" cy="60" r="20" /> </clipPat...