The article emphasizes that, despite the emergence of advanced technologies in software development, many systems still rely on legacy code, which is essential for daily operations. Legacy code is defined not just by its age but by its complexity and the risks associated with altering it. Changes to legacy systems can disrupt the underlying functions, thus teams must exercise caution. Influential thinkers like Michael Feathers and Martin Fowler highlight the need for incremental improvements rather than sweeping rewrites, underscoring the importance of understanding legacy systems thoroughly.
Legacy code is not simply outdated; it represents systems that are intricate and crucial for daily operations, posing risks when attempting changes.
Michael Feathers defines legacy code as 'code without tests', yet the reality reflects that systems with tests can also present risks due to uncertainties.
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