April 2025
Intermediate to advanced
324 pages
7h 35m
Portuguese (Portugal, Brazil)
Content preview from Programando o TypeScript
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Capítulo 2. Typescript: Uma visão de 10_000 pés
Este trabalho foi traduzido com recurso a IA. Agradecemos o teu feedback e comentários: translation-feedback@oreilly.com
Nos próximos capítulos, apresentarei a linguagem TypeScript, darei uma visão geral de como o TypeScript Compiler (TSC) funciona e farei um tour pelos recursos do TypeScript e pelos padrões que podem ser desenvolvidos com eles. Começaremos com o compilador.
O compilador
Dependendo das linguagens de programação com que trabalhaste no passado (ou seja, antes de decidires comprar este livro e comprometeres-te com uma vida de type safety), terás uma compreensão diferente de como os programas funcionam. A maneira como o Typescript funciona é incomum em comparação com outras linguagens convencionais, como JavaScript ou Java, por isso é importante que estejamos na mesma página antes de prosseguirmos.
Vamos começar de uma forma geral: os programas são ficheiros que contêm um monte de texto escrito por ti, o programador. Esse texto é analisado por um programa especial chamado compilador, que o transforma numa árvore de sintaxe abstrata (AST), uma estrutura de dados que ignora coisas como espaços em branco, comentários e a tua posição no debate entre separadores e espaços. O compilador converte então essa AST numa representação de nível inferior chamada bytecode. Podes alimentar esse bytecode noutro programa chamado runtime para o avaliar e obter um resultado. Assim, quando executas um programa, o que estás realmente a fazer ...
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