
Preguntas de JavaScript
Authored by Ricardo Chipana
Computers
Professional Development
Used 1+ times

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14 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
¿Cómo se declara una variable que no cambiará su valor?
var edad = 30;
let edad = 30;
const edad = 30;
edad = 30;
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Para repetir un bloque 5 veces, se usa:
while(i { console.log('Hola'); }
function => saludar() {}
saludar:function() {}
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Un callback es:
Una función que se llama a sí misma.
Una función pasada como argumento a otra.
Una función anónima sin parámetros.
Un error en tiempo de ejecución.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
¿Qué devuelve .map() comparado con .forEach()?
.map() devuelve un nuevo array; .forEach() no.
.map() modifica el array original; .forEach() no.
Son equivalentes.
.forEach() devuelve un nuevo array; .map() no.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
¿Cuál NO es un tipo primitivo en JavaScript?
boolean
object
number
string
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
¿Qué devuelve typeof null?
"null"
"undefined"
"object"
TypeError
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
¿Cuál es la diferencia entre == y ===?
No hay diferencia.
== compara tipo; === compara valor.
== compara valor; === compara valor y tipo.
=== solo se usa en strings.
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