34. What's the output?
Javob variantlari:
Javob variantlari:
Anonymous Quiz
0%
A: "object"
100%
B: "number"
0%
C: "function"
0%
D: "undefined"
35. Which of these values are falsy?
0;
new Number(0);
('');
(' ');
new Boolean(false);
undefined;
35. Which of these values are falsy?
Javob variantlari:
Javob variantlari:
Anonymous Quiz
100%
A: 0, '', undefined
0%
B: 0, new Number(0), '', new Boolean(false), undefined
0%
C: 0, '', new Boolean(false), undefined
0%
D: All of them are falsy
36. What's the output?
console.log(typeof typeof 1); Javob variantlari:
console.log(typeof typeof 1); Javob variantlari:
Anonymous Quiz
0%
A: "number"
100%
B: "string"
0%
C: "object"
0%
D: "undefined"
37. What's the output?
const numbers = [1, 2, 3];
numbers[10] = 11;
console.log(numbers);
37. What's the output?
Javob variantlari:
Javob variantlari:
Anonymous Quiz
0%
A: [1, 2, 3, null x 7, 11]
0%
B: [1, 2, 3, 11]
100%
C: [1, 2, 3, empty x 7, 11]
0%
D: SyntaxError
38. What's the output?
(() => {
let x, y;
try {
throw new Error();
} catch (x) {
(x = 1), (y = 2);
console.log(x);
}
console.log(x);
console.log(y);
})();38. What's the output?
Javob variantlari:
Javob variantlari:
Anonymous Quiz
100%
A: 1 undefined 2
0%
B: undefined undefined undefined
0%
C: 1 1 2
0%
D: 1 undefined undefined
Mana o‘zbek tiliga tarjimasi:
**39. JavaScript’da hamma narsa quyidagilardan biri hisoblanadi…**
**39. JavaScript’da hamma narsa quyidagilardan biri hisoblanadi…**
Anonymous Quiz
100%
A: primitive or object
0%
B: function or object
0%
C: trick question! only objects
0%
D: number or object
40. What's the output?
[[0, 1], [2, 3]].reduce(
(acc, cur) => {
return acc.concat(cur);
},
[1, 2],
);
40. What's the output?
Javob variantlari;
Javob variantlari;
Anonymous Quiz
0%
A: [0, 1, 2, 3, 1, 2]
0%
B: [6, 1, 2]
100%
C: [1, 2, 0, 1, 2, 3]
0%
D: [1, 2, 6]
41. What's the output?
Javob variantlari:
Javob variantlari:
Anonymous Quiz
0%
A: false true false
100%
B: false false true
0%
C: false true true
0%
D: true true false
42. What does the setInterval method return in the browser?
setInterval(() => console.log('Hi'), 1000);
setInterval(() => console.log('Hi'), 1000);
Anonymous Quiz
100%
A: a unique id
0%
B: the amount of milliseconds specified
0%
C: the passed function
0%
D: undefined
43. What does this return?
[...'Lydia'];
[...'Lydia'];
Anonymous Quiz
100%
A: ["L", "y", "d", "i", "a"]
0%
B: ["Lydia"]
0%
C: [[], "Lydia"]
0%
D: [["L", "y", "d", "i", "a"]]
44. What's the output?
function* generator(i) {
yield i;
yield i * 2;
}
const gen = generator(10);
console.log(gen.next().value);
console.log(gen.next().value);44. What's the output?
Javob variantlari:
Javob variantlari:
Anonymous Quiz
0%
A: [0, 10], [10, 20]
0%
B: 20, 20
100%
C: 10, 20
0%
D: 0, 10 and 10, 20
45. What does this return?
const firstPromise = new Promise((res, rej) => {
setTimeout(res, 500, 'one');
});
const secondPromise = new Promise((res, rej) => {
setTimeout(res, 100, 'two');
});
Promise.race([firstPromise, secondPromise]).then(res => console.log(res));45. What does this return?
Javob variantlari:
Javob variantlari:
Anonymous Quiz
0%
A: "one"
100%
B: "two"
0%
C: "two" "one"
0%
D: "one" "two"
46. What's the output?
let person = { name: 'Lydia' };
const members = [person];
person = null;
console.log(members);