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To get length of "character varying", "text" fields, Use char_length() or character_length().

This is related to the extend functionality of less, which was introduced in v1.4.0. "Extend is a Less pseudo-class which merges the selector it is put on with ones that match what it references." [ref] selector1:extend(css selector){ //other styles go here} selector1{ &:extend...

Many third-party APIs require a key, allowing them to prevent abuse. If they issue you a key, it's very important that you not commit the key into a public repository, as this will allow others to steal your key.

This documentation page describes the four object systems in R and their high-level similarities and differences. Greater detail on each individual system can be found on its own topic page. The four systems are: S3, S4, Reference Classes, and S6.

Software entities (class, modules, functions etc) should be open for extension but closed for modification.

The principle basically says, Class should depend on abstractions (e.g interface, abstract classes), not specific details (implementations). That means, You should let the caller create the dependencies instead of letting the class itself create the dependencies.

This section provides an overview of what virtualenv is, and why a developer might want to use it. It should also mention any large subjects within virtualenv, and link out to the related topics. Since the Documentation for virtualenv is new, you may need to create initial versions of those rel...

CBCentralManager acts as a manager class central side app generally iOS app. which is responsible for bridging communication between peripherals and central.

It is sometimes useful to get the maven properties, such as the current version, in code. Here are some ways to to it.

This topic would cover how angular-cli project is ready for production build, what all necessary steps taken before deploying, how to create war file for project deployment and finally how to configure the apache tomcat for angular-cli project deployment.

A Virtual Environment ("virtualenv") is a tool to create isolated Python environments. It keeps the dependencies required by different projects in separate places, by creating virtual Python env for them. It solves the “project A depends on version 2.xxx but, project B needs 2.xxx” dilemma...

Devise is authentication solution for Rails. Before going any further i would like to add quick note on API. So API does not handle sessions (is stateless) which means one that provide response after you request, and then requires no further attention, which means no previous or future state is requ...

In web pages contain number of frame, selenium consider Frame is seprate window so access the content present into frame need to switch into frame. Many time we need Web structure where we have frame with in frame to navigate within frame windows Selenium provide swithTo() method.

A lot of time from C++ developers is spent debugging. This topic is meant to assist with this task and give inspiration for techniques. Don't expect an extensive list of issues and solutions fixed by the tools or a manual on the mentioned tools. This topic ain't complete yet, examples on follo...