March 2025
Intermediate to advanced
240 pages
5h 49m
Portuguese (Portugal, Brazil)
Content preview from Node.js eficiente
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Capítulo 4. Erros e depuração
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No Node, os objectos de erro são importantes. Eles são usados para comunicar a existência de problemas e fornecer contexto e detalhes sobre eles. O bom tratamento de erros torna os programas mais confiáveis e seguros.
Este capítulo é sobre erros e como lidar com eles. Primeiro, falaremos sobre lançar e capturar erros e, em seguida, discutiremos os diferentes tipos de erros e como é o gerenciamento de erros em camadas. Em seguida, exploraremos a depuração do código Node e discutiremos algumas medidas preventivas que podemos usar para reduzir possíveis erros.
Erros de lançamento e de captura
Um erro no Node é um objeto instanciado a partir da classe Error. Por vezes, terás de criar os teus próprios objectos de erro, como este:
consterror=newError('Some message');
Este é um objeto de erro genérico, que não deve ser usado, pois há uma opção melhor que discutiremos em breve. O Node também tem erros incorporados, que são basicamente objetos de erro já criados para ti. A próxima secção aborda estes.
O que fazes exatamente com um objeto de erro? Bem, independentemente do tipo de erro e de o teres criado ou de ele ter sido incorporado, sempre que estiveres num local do código onde uma condição não deveria acontecer, tens de assinalar os detalhes desse problema a quem estiver a utilizar o teu código. Podes fazer isso lançando o erro. ...
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