April 2025
Intermediate to advanced
324 pages
7h 35m
Portuguese (Portugal, Brazil)
Content preview from Programando o TypeScript
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Capítulo 5. Classes e Interfaces
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Se fores como a maioria dos programadores que vêm de uma linguagem de programação orientada a objectos, as classes são o teu pão e manteiga. As classes são a forma como organizas e pensas no teu código, e servem como a tua unidade primária de encapsulamento. Vais gostar de saber que as classes TypeScript são muito inspiradas no C#, e suportam coisas como modificadores de visibilidade, inicializadores de propriedades, polimorfismo, decoradores e interfaces. Mas como as classes TypeScript compilam para classes JavaScript regulares, também podes expressar expressões idiomáticas JavaScript como mixins de uma forma segura para o tipo.
Alguns dos recursos de classe do Typescript, como inicializadores de propriedade e decoradores, também são suportados por classes JavaScript,1 e, portanto, gera código em tempo de execução. Outros recursos, como modificadores de visibilidade, interfaces e genéricos, são recursos somente do TypeScript que existem apenas em tempo de compilação e não geram nenhum código quando você compila seu aplicativo para JavaScript.
Neste capítulo, vou guiar-te através de um exemplo alargado de como trabalhamos com classes em TypeScript, para que possas ganhar alguma intuição não só para as funcionalidades da linguagem orientada a objectos do TypeScript, mas também para como e porque as usamos. Tenta seguir o exemplo, ...
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