April 2025
Intermediate to advanced
380 pages
10h 16m
Portuguese (Portugal, Brazil)
Content preview from Python robusto
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Capítulo 7. Adotar a verificação de tipos na prática
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Muitos programadores sonham com o dia em que vão finalmente trabalhar num projeto completamente novo. Um projeto green-field é um projeto novo em folha, onde tens uma folha em branco com a arquitetura, design e modularidade do teu código. No entanto, a maioria dos projectos depressa se tornam brown-field, ou código legado. Estes projectos já passaram por algumas fases; grande parte da arquitetura e do design já foram solidificados. Fazer mudanças grandes e abrangentes terá impacto nos utilizadores reais. O termo " brown-field " é muitas vezes visto como depreciativo, especialmente quando parece que estás a arrastar uma grande bola de lama.
No entanto, nem todos os projectos de campos castanhos são um castigo para trabalhar. Michael Feathers, autor de Working Effectively With Legacy Code (Pearson), tem o seguinte a dizer:
Num sistema bem mantido, pode demorar algum tempo a perceber como fazer uma alteração, mas assim que a fizeres, a alteração é normalmente fácil e sentes-te muito mais confortável com o sistema. Num sistema antigo, pode demorar muito tempo a perceber o que fazer e a mudança também é difícil.1
Feathers define código legado como "código sem testes". Eu prefiro uma definição alternativa: código legado é simplesmente código em que já não podes discutir o código com os programadores que o escreveram. ...
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