A Code Sample Answer will trigger only when Bing intelligently detects the coding intent with high confidence. "To achieve this level of precision for query intent detection, Bing's natural language processing pipelines for developers leverages patterns found in training data from developer queries collected over the years containing commonly used terms and text structure typical for coding queries. The system also leverages a multitude of click signals to improve the precision even further"... [I]t also covers other tools used by developers. For example, a Code Sample Answer can be triggered when searching for git commands and their syntax.Bing extracts "the best matched code samples from popular, authoritative and well moderated sites like Stackoverflow, Github, W3Schools, MSDN, Tutorialpoints, etc. taking into account such aspects as fidelity of API and programming language match, counts of up/down-votes, completeness of the solution and more."
JAXenter.com notes they obtained similar results using the privacy-friendly search engine DuckDuckGo, and ultimately asks whether this functionality could affect the search habits of developers. "Is this new feature enough to make Bing a viable search engine tool for programmers or will Google be the go-to for hunting down source code?"