September 2024
Intermediate to advanced
706 pages
22h 41m
Spanish
Content preview from JavaScript: La Guía Definitiva, 7ª Edición
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Capítulo 2. Estructura léxica
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La estructura léxica de un lenguaje de programación es el conjunto de reglas elementales que especifican cómo se escriben los programas en ese lenguaje. Es la sintaxis de más bajo nivel de un lenguaje: especifica cómo son los nombres de las variables, los caracteres delimitadores de los comentarios y cómo se separa una sentencia del programa de la siguiente, por ejemplo. Este breve capítulo documenta la estructura léxica de JavaScript. Abarca:
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Sensibilidad a mayúsculas y minúsculas, espacios y saltos de línea
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Comentarios
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Literales
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Identificadores y palabras reservadas
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Unicode
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Punto y coma opcional
2.1 El texto de un programa JavaScript
JavaScript es un lenguaje que distingue entre mayúsculas y minúsculas. Esto significa que las palabras clave del lenguaje, las variables, los nombres de funciones y otros identificadores deben escribirse siempre con un uso coherente de mayúsculas y minúsculas. La palabra clavewhile, por ejemplo, debe escribirse "while", no "While" o "WHILE". Del mismo modo, online, Online, OnLine, y ONLINEson cuatro nombres de variable distintos.
JavaScript ignora los espacios que aparecen entre los tokens de los programas. En su mayor parte, JavaScript también ignora los saltos de línea (pero consulta§2.6 para ver una excepción). Como puedes utilizar espacios y nuevas líneas libremente en tus programas, ...
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