Tutorial by Topics: if

Swift is an application and systems programming language developed by Apple and distributed as open source. Swift interoperates with Objective-C and Cocoa/Cocoa touch APIs for Apple's macOS, iOS, tvOS, and watchOS operating systems. Swift currently supports macOS and Linux. Community efforts are...
git diff [options] [<commit>] [--] [<path>…​] git diff [options] --cached [<commit>] [--] [<path>…​] git diff [options] <commit> <commit> [--] [<path>…​] git diff [options] <blob> <blob> git diff [options] [--no-index] [--] <path> &l...
QuantifiersDescription?Match the preceding character or subexpression 0 or 1 times (preferably 1).*Match the preceding character or subexpression 0 or more times (as many as possible).+Match the preceding character or subexpression 1 or more times (as many as possible).{n}Match the preceding chara...
CSS specificity intends to promote code conciseness by allowing an author to define some general formatting rules for a broad set of elements, and then to override them for a certain subset.
AttributeDetailsnameSets the element's name, to be used with an a tag to change the iframe's src.widthSets the element's width in pixels.heightSets the element's height in pixels.srcSpecifies the page that will be displayed in the frame.srcdocSpecifies the content that will be displayed in the fra...
notification name { email = [email protected], [email protected], ... post = http://example.com get = http://example.com next = another-notification-definition timeout = 30m runOnActions = false body = {"text": {{.|json}}} contentType = application/json print = true...
Local notifications allow your app to notify the user about content which does not require the use of a server. Unlike remote notifications which are triggered from a server, local notifications are scheduled and triggered within an app. Notifications in general are targeted to increase user intera...
Notification.requestPermission(callback) Notification.requestPermission().then(callback, rejectFunc) new Notification(title, options) notification.close() The Notifications API was designed to allow browser access to notifying the client. Support by browsers might be limited. Also suppo...
Liferay Portal CE is a portal software built in Java by Liferay Inc. Liferay DXP (Digital Experience Platform) is a platform built on top of Liferay Portal for digital solutions, integrating customer and user satisfaction analysis tools and Enterprise-grade quality performances and tooling. It w...
Official documentation Manifest File Format Format Manifest file is written in JSON (JavaScript Object Notation) format. This format differs from more loose rules of writing object literals in JavaScript code. Among important differences: Every key name and string literal must be in d...
If the access modifier is omitted, classes are by default internal methods are by deault private getters and setters inherit the modifier of the property, by default this is private Access modifiers on setters or getters of properties can only restrict access, not widen it: public string ...
Butterknife is a view binding tool that uses annotations to generate boilerplate code for us. This tool is developed by Jake Wharton at Square and is essentially used to save typing repetitive lines of code like findViewById(R.id.view) when dealing with views thus making our code look a lot cleaner....
Terms and concepts Screen size Actual physical size, measured as the screen's diagonal. For simplicity, Android groups all actual screen sizes into four generalized sizes: small, normal, large, and extra-large. Screen density The quantity of pixels within a physical area of the screen; usu...
This code will turn off the capability for a user to hold down the Shift key when opening a database to skip the default form opening and allow the user access to the Navigation Pane and VB Editor. In DB’s that you do not want users to have access to either of these (along with disabling the use ...
iOS notifications are a simple and powerful way to send data in a loosely coupled way. That is, the sender of a notification doesn't have to care about who (if anyone) receives the notification, it just posts it out there to the rest of the app and it could be picked up by lots of things or nothing ...
from django.contrib.postgres.fields import ArrayField class ArrayField(base_field, size=None, **options) FooModel.objects.filter(array_field_name__contains=[objects, to, check]) FooModel.objects.filter(array_field_name__contained_by=[objects, to, check]) Note that although the size param...
JSONField(**options) Django's JSONField actually stores the data in a Postgres JSONB column, which is only available in Postgres 9.4 and later. JSONField is great when you want a more flexible schema. For example if you want to change the keys without having to do any data migratio...

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