JavaScript Test 5

What is the type of undefined in JavaScript?

What is the result of:

let a = 5;
let b = ++a;

What is the output?

for (let i = 0; i < 5; i++) {
  if (i === 2) continue;
  console.log(i);
}

What is the result of:

console.log(Array.isArray([1, 2, 3]));

What will greet("Alice") print if the function is defined as:

function greet(name = "Guest") { console.log(name); }

What is the output?

let obj = {a:1, b:2};
for (let key in obj) {
  console.log(key);
}

Which of the following are types of execution context in JavaScript?

Which method selects the first element that matches a CSS selector?

Which function correctly uses rest parameters to accept multiple arguments?

How does execution behave with multiple await statements?

What is the result of 0 == "0" in JavaScript?

What is the result of 2 ** 3 in JavaScript?

How many times will "Hello" be printed?

for (let i = 0; i < 2; i++) {
  for (let j = 0; j < 3; j++) {
    console.log("Hello");
  }
}

What will be the result of:

let a = [1, 2];
let b = [3, 4];
console.log(a.concat(b));

What happens if you call a function expression before it is defined?

greet();
var greet = function() { console.log("Hello"); };

What does Object.assign(target, source) do?

What does the following code output?

class Car {
  constructor(name) {
    this.name = name;
  }
  showName() {
    console.log(this.name);
  }
}
let c = new Car("Tesla");
c.showName();

What is the difference between querySelectorAll and getElementsByClassName?

How do you export a function in ES6 module?

Which of the following is equivalent to:

fetchData().then(data => console.log(data)).catch(err => console.log(err));