 The idiom can be seen as a concept underlying a pattern in code, which is represented in implementation by contiguous or scattered code fragments.These fragments are available in several programming languages, frameworks or even libraries.Generally speaking, a programming idiom is a natural language expression of a simple task, algorithm, or data structure that is not a built-in feature in the programming language being used, or, conversely, the use of an unusual or notable feature that "is" built into a programming language.