3. What is a variable used for?
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A) To store data
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B) To display text on a page
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C) To change the syntax
5. What does immutable mean?
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A) Something that can be changed
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B) Something that cannot be changed
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C) Something that runs automatically
7. What does the map() method do?
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A) It changes the original array
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B) It creates a new array
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C) It deletes data
8. What does the forEach() method usually cause?
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A) A new array
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B) A mutation
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C) An error
9. What is assignment in programming?
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A) Giving a value to a variable
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B) Changing a loop
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C) Deleting a function
10. What is the main difference between map() and forEach()?
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A) map creates a new array, forEach doesn’t
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B) forEach runs faster than map
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C) map deletes the array
1. What's the output?
function sayHi() { console.log(name); console.log(age); var name = 'Lydia'; let age = 21; } sayHi();
function sayHi() { console.log(name); console.log(age); var name = 'Lydia'; let age = 21; } sayHi();
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A: Lydia and undefined
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B: Lydia and ReferenceError
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C: ReferenceError and 21
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D: undefined and ReferenceError
2. What's the output?
for (var i = 0; i < 3; i++) { setTimeout(() => console.log(i), 1); } for (let i = 0; i < 3; i++) { setTimeout(() => console.log(i), 1); }
for (var i = 0; i < 3; i++) { setTimeout(() => console.log(i), 1); } for (let i = 0; i < 3; i++) { setTimeout(() => console.log(i), 1); }
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A: 0 1 2 and 0 1 2
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B: 0 1 2 and 3 3 3
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C: 3 3 3 and 0 1 2
3. What's the output?
const shape = { radius: 10, diameter() { return this.radius * 2; }, perimeter: () => 2 * Math.PI * this.radius, }; console.log(shape.diameter()); console.log(shape.perimeter());
const shape = { radius: 10, diameter() { return this.radius * 2; }, perimeter: () => 2 * Math.PI * this.radius, }; console.log(shape.diameter()); console.log(shape.perimeter());
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A: 20 and 62.83185307179586
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B: 20 and NaN
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C: 20 and 63
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D: NaN and 63
4. What's the output?
+true; !'Lydia';
+true; !'Lydia';
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A: 1 and false
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B: false and NaN
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C: false and false
5. Which one is true?
const bird = {
size: 'small',
};
const mouse = {
name: 'Mickey',
small: true,
};5. Which one is true?
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Javob variantlari:
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A: mouse.bird.size is not valid
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B: mouse[bird.size] is not valid
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C: mouse[bird["size"]] is not valid
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C: mouse[bird["size"]] is not valid
6. What's the output?
let c = { greeting: 'Hey!' };
let d;
d = c;
c.greeting = 'Hello';
console.log(d.greeting);6. What's the output?
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Javob variantlari:
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A: Hello
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B: Hey!
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C: undefined
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D: ReferenceError
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E: TypeError
7. What's the output?
let a = 3;
let b = new Number(3);
let c = 3;
console.log(a == b);
console.log(a === b);
console.log(b === c);
7. What's the output?
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Javob variantlari:
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A: true false true
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B: false false true
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C: true false false
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D: false true true
8. What's the output?
class Chameleon {
static colorChange(newColor) {
this.newColor = newColor;
return this.newColor;
}
constructor({ newColor = 'green' } = {}) {
this.newColor = newColor;
}
}
const freddie = new Chameleon({ newColor: 'purple' });
console.log(freddie.colorChange('orange'));8. What's the output?
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Javob variantlari:
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A: orange
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B: purple
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C: green
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D: TypeError