JavaScript Objective Questions and Answers

What will be logged?

function outer() {
  let x = 10;
  return function inner() {
    return x;
  };
}
console.log(outer()());

Which keyword is used to create a class?

Which method selects an element by ID?

What is the output?

console.log(0 == false);
console.log(0 === false);

Which keyword stops loop execution?

What is the output?

console.log([1,2,3] + [4,5]);

Which API is used to fetch data over HTTP?

Which storage persists after browser close?

Which operator safely accesses nested properties?

Which loop iterates over object keys?

What is the output?

console.log(NaN === NaN);

Which method removes whitespace from both ends?

Which keyword creates a constant?

What is the output?

console.log(typeof function(){});

Which statement prevents default browser behavior?