Online Access Free JS-Dev-101 Exam Questions

Which two console logs output NaN?

• A.console.log(10 / 'five');
• B.console.log(10 / 0);
• C.console.log(parseInt('two'));
• D.console.log(10 / Number('5'));

Which two code snippets show working examples of a recursive function?

• A.function factorial(numVar) {
  if (numVar < 0) return;
  if (numVar === 0) return 1;
  return numVar - 1;
  }
• B.const sumToTen = numVar => {
  if (numVar < 0)
  return;
  return sumToTen(numVar + 1);
  };
• C.let countingDown = function(startNumber) {
  if (startNumber > 0) {
  console.log(startNumber);
  return countingDown(startNumber - 1);
  } else {
• D.const factorial = numVar => {
  if (numVar < 0) return;
  if (numVar === 0) return 1;
  return numVar * factorial(numVar - 1);
  };

Refer to the code below:
01 let first = 'Who';
02 let second = 'What';
03 try {
04 try {
05 throw new Error('Sad trombone');
06 } catch (err) {
07 first = 'Why';
08 throw err;
09 } finally {
10 second = 'When';
11 }
12 } catch (err) {
13 second = 'Where';
14 }
What are the values for first and second once the code executes?

• A.first is Why and second is Where.
• B.first is Why and second is When.
• C.first is Who and second is When.
• D.first is Who and second is Where.

Why does second have access to variable a?

• A.Outer function's scope
• B.Inner function's scope
• C.Hoisting
• D.Prototype Chain

Refer to the following code:
01 let obj = {
02 foo: 1,
03 bar: 2
04 }
05 let output = []
06
07 for (let something of obj) {
08 output.push(something);
09 }
10
11 console.log(output);
What is the value of output on line 11?

• A.["foo:1", "bar:2"]
• B.[1, 2]
• C.["foo", "bar"]
• D.An error will occur due to the incorrect usage of the for_of statement on line 07.