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Wikipedia definition of dependency injection is: In software engineering, dependency injection is a software design pattern that implements inversion of control for resolving dependencies. A dependency is an object that can be used (a service). An injection is the passing of a dependency to a dep...

In the first versions of iText, there was only one font class: Font. With this font, you could create a Font object for fourteen fonts from five font families: Helvetica (regular, bold, oblique, bold-oblique), Times Roman (regular, bold, italic, bold-italic), Courier (regular, bold, oblique, bold...

In the original design for iText, it was possible to create a high-level Document object, and then have different DocListener objects listening to that Document object. This was achieved by using different writers: a PdfWriter, an HTMLWriter, and an RtfWriter. When using a PdfWriter, a PdfDocument...

The Codeigniter Sessions class uses browser cookies to save data that will persist across multiple page loads. Reference: https://codeigniter.com/user_guide/libraries/sessions.html

Aggregate functions in SQL Server run calculations on sets of values, returning a single value. AVG([ALL|DISTINCT]expression) COUNT([ALL|DISTINCT]expression) MAX([ALL|DISTINCT]expression) MIN([ALL|DISTINCT]expression) SUM([ALL|DISTINCT]expression)

The number of partitions is critical for an application's performance and/or successful termination. A Resilient Distributed Dataset (RDD) is Spark's main abstraction. An RDD is split into partitions, that means that a partition is a part of the dataset, a slice of it, or in other words, a chunk ...

using Compat Compat.String Compat.UTF8String @compat f.(x, y) It is sometimes very difficult to get new syntax to play well with multiple versions. As Julia is still undergoing active development, it is often useful simply to drop support for older versions and instead target just the ne...

Vararg Keyword: vararg is used in a method declaration to indicate that a variable number of parameters will be accepted. Spread Operator: An asterisk (*) before an array that is used in function calls to "unfold" the contents into individual parameters.

A Collection is a container object that is included in the VBA runtime. No additional references are required in order to use it. A Collection can be used to store items of any data type and allows retrieval by either the ordinal index of the item or by using an optional unique key. Feature C...