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Test: Variables y Constantes

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Test: Variables y Constantes

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About this activity

Conceptos clave

Created by

Alejandra Zapeta
Alejandra Zapeta
Guatemala

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Test: Variables y Constantes
 

Test: Variables y ConstantesOnline version

Conceptos clave

by Alejandra Zapeta
1

¿Qué diferencia hay entre una variable y una constante en programación?

2

¿Qué se usa habitualmente para declarar una constante en muchos lenguajes modernos?

3

¿Qué conviene hacer al nombrar variables para que sean claras?

4

¿Qué ocurre cuando intentas cambiar el valor de una constante?

5

¿Qué característica comparten variable y constante?

6

¿Cuál sería un nombre válido de una variable?

7

¿Qué regla típica de nombres NO es válida?

8

En JavaScript, ¿qué diferencia hay entre var y let respecto a redeclaración?

9

¿Qué tipo de datos puede almacenar una variable?

10

¿Por qué usar const para valores que no deben modificarse?

Explicación

Las variables permiten reasignación; las constantes mantienen su valor tras la asignación.

La palabra clave const indica que el valor no debe cambiar.

Nombres claros facilitan la lectura y mantenimiento del código.

Las constantes deben permanecer constantes tras su definición.

Ambos almacenan datos; la diferencia está en si pueden cambiar.

Los nombres deben empezar con letra o guion bajo y evitar caracteres especiales.

Los identificadores no deben empezar con dígitos en la mayoría de lenguajes.

Var permite redefinición; let evita redeclaraciones accidentales.

Las variables pueden contener distintos tipos según el lenguaje (num, texto, etc.).

Constantes claras previenen cambios accidentales y facilitan el mantenimiento.

 
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