September 2024
Intermediate to advanced
706 pages
22h 41m
Spanish
Content preview from JavaScript: La Guía Definitiva, 7ª Edición
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Capítulo 3. Tipos, valores y variables
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Ordenador Los programas funcionan manipulando valores, como el número 3,14 o el texto "Hola Mundo". Las clases de valores que pueden representarse y manipularse en un lenguaje de programación se conocen como tipos, y una de las características más fundamentales de un lenguaje de programación es el conjunto de tipos que admite. Cuando un programa necesita retener un valor para utilizarlo en el futuro, asigna el valor a (o "almacena" el valor en) una variable. Las variables tienen nombres, y permiten utilizar esos nombres en nuestros programas para referirse a valores. El funcionamiento de las variables es otra característica fundamental de cualquier lenguaje de programación. Este capítulo explica los tipos, valores y variables en JavaScript. Comienza con una visión general y algunas definiciones.
3.1 Visión general y definiciones
Los tipos de JavaScript pueden dividirse en dos categorías: tipos primitivosy tipos objeto. Los tipos primitivos de JavaScript incluyen números, cadenas de texto (conocidas como cadenas) y valores de verdad booleanos (conocidos como booleanos). Una parte importante de este capítulo está dedicada a una explicación detallada de los tipos numéricos(§3.2) y de cadena(§3.3) de JavaScript. Los booleanos se tratan en §3.4.
Los valores especiales de JavaScript null y undefined son valores primitivos, pero ...
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