in Data Structures · 5 min read
Linked List is a linear collection of data elements, whose order is not given by their physical placement in memory. Instead, each element points to the next. It is a data structure consisting of a collection of nodes which together represent a sequence.
in Ruby · 10 min read
The built-in class File provides the facilities for manipulating files in Ruby. Let us explore the basic file operations, including opening, reading, writing along with querying file objects to get information about the file itself.
in Active Record · 1 min read
There are multiple ways to retrive a random row from a table. The fastest way requires no custom SQL.Let's see how to retrieve a random row from a table using ActiveRecord.
in Mysql · 1 min read
Its easy and quite common to forget a database's password. However, this doesn't mean the end of the world. Let's see how we can recover MySQL database server password following five easy steps.
in Rails · 1 min read
It's very common to want to highlight the current link within a navigation list for the current action being performed. In Rails, if you are using Ajax, then this is easy, handle the onclick event to highlight the current link.
in Css · 1 min read
Here is one way to center a fixed-width/fixed-height div at the center of its container. This could be adapted to centering text, images, etc. within their containers. Essentially, we do a bit of arithmetic to get the fixed-sized element centered using absolute positioning and margins. Note that the parent container must have a `position: relative` property for this to work.