Question 1

Tipo de dato null

Accepted Answer

Object

Answer

undefined

Answer

nill

Question 2

Parsea un String JSON a un Objeto JavaScript

Accepted Answer

JSON.parse(stringJSON)

Answer

Object.stringify(obj);

Question 3

No es correcto en JS

Accepted Answer

Obligatorio poner ; al final de una oración

Answer

débilmente tipeado

Answer

sensible a mayusculas y minusculas

Question 4

Que hace el código: document.querySelector(‘p.five’)

Accepted Answer

Selecciona el primer elemento párrafo con una clase five

Answer

Selecciona todos los párrafos con la clase “five”

Answer

Seleccionaba los 5 párrafos

Question 5

Que regresa :

"let x = ""4"" + 4 +5;
let y = 4 + 4 + “5”;
console.log(x+’ ’+y)". 
[blank_start]R=[blank_end]

Accepted Answer

445 85

Question 6

Que regresa: 
var square = num => num * num;

Accepted Answer

Retorna el cuadrado de un numero dado

Answer

función que no recibe parámetros

Question 7

Que retorna

"function f(x, y=2, z=7)
{
return x + y + z;
}
console.log(f(1) === 10);"

Answer

true

Question 8

Que retorna 
"function foo(){
return 5
}
let myV = foo;"

Accepted Answer

myV hace referencia a la función

Answer

Asigna el valor 5 a myV

Answer

error

Question 9

Agrega un valor al final del arr = ["A","B","C","D"]

Accepted Answer

arr[arr.length] = "value"

Answer

arr[arr.length+1] = "value"

Answer

arr[arr.length-1] = "value"

Answer

arr + "value"

Question 10

Estados de una promesa

Accepted Answer

pendiente

Accepted Answer

rechazada

Accepted Answer

cumplida

Answer

aceptada

Answer

aprovada

Answer

descartada

Question 11

¿que imprimira en consola?
let mascotas =[“perro”,”gato”,”loro”,""canario""];
mascotas.filter(mascota => mascota.length >= 5);
console.log(mascotas);
[blank_start]R =[blank_end]

Accepted Answer

["perro", “gato”,”loro”, "canario"]

Question 12

Que hace:
"if(x===y){
console.log(‘Hola mundo’);
}"

Accepted Answer

Compara el valor y tipo de X y Y

Answer

Compara las referencias de memoria de X y Y

Answer

Compara los valores de las variables

Question 13

Que retorna:

"var x;
var y = x === null;"

Answer

true

Question 14

Que retorna

"¿Cuál es el resultado del siguiente programa?
int j=2; int k=3; int m=2; System.out.println ((k+m < j) || (3-j >= k));"

Answer

true

Question 15

De esta manera podemos convertir un objeto de JavaScript en un texto JSON

Accepted Answer

Object.stringify(obj);

Answer

JSON.parse(stringJSON)

Question 16

Que retorna

"function getName(){
Const name = ‘juan’;
name =‘jose’;
return name;
};
getName();"

[blank_start]R=[blank_end]

Accepted Answer

error

Question 17

"¿Qué se imprime en la consola?
var foo = function foo() {
console.log(foo === foo); 
};
foo();"

Accepted Answer

verdadero

Answer

falso

Answer

error

Question 18

"¿Qué valor se alerta?
function foo(a, b) {
arguments[1] = 2;
alert(b);
}
foo(1);"

Accepted Answer

Undefined

Answer

1

Answer

2

Answer

error

Question 19

"¿Cuál es el orden de los valores alertados?
var x = 3; 
var foo = {
  x: 2, 
   baz: {
     x: 1, 
       bar: function() {
          return this.x; 
          } 
    } 
}

var go = foo.baz.bar;
alert(go());
alert(foo.baz.bar());"

Accepted Answer

3,1

Answer

1,3

Answer

error

Question 20

"¿Qué se alerta?
function bar() {
return foo; 
foo = 10;
function foo() {}
 var foo = '11';
} alert(typeof bar());"

Accepted Answer

function

Answer

10

Answer

11

Answer

number

Question 21

"(function f(f) {
return typeof f();
})

(function(){
return 1;
})"

Accepted Answer

number

Answer

1

Answer

function

Question 22

Palabra reservada para invocar un método de la super clase

Accepted Answer

super

Answer

let

Answer

this

Question 23

Ordena de forma ascendente un arreglo

Accepted Answer

sort

Answer

push

Answer

unshift

Answer

pop

Answer

slice

Question 24

Borra el ultimo elemento del arreglo

Accepted Answer

pop

Answer

sort

Answer

push

Answer

unshift

Answer

slice

Question 25

Agregar "Lemon" al inicio del arreglo

Accepted Answer

unshift

Answer

sort

Answer

push

Answer

pop

Answer

slice

Question 26

Selecciona los elementos ""orange"", y ""apple"" del arreglo fruits
var fruits = [""Banana"", ""Orange"", ""Lemon"", ""Apple"", “Mango”];

Accepted Answer

slice

Answer

sort

Answer

push

Answer

unshift

Answer

pop

Question 27

Agregar ""Kiwi"" al final del arreglo

Accepted Answer

push

Answer

sort

Answer

unshift

Answer

pop

Answer

slice

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