Salesforce JavaScript Developer Practice Exam

What is the output of the following code snippet when logged to the console? let num = 10; const increaseNumber = () => num++; const increasePassedNumber = number => number++; const num1 = increaseNumber(); const num2 = increasePassedNumber(num1); console.log(num1); console.log(num2);

1. 10, 10

2. 10, 11

3. 11, 11

4. 11, 12

The correct answer is: 10, 10

The correct output of the code snippet relates to how the variables and functions interact in JavaScript, particularly in regards to the concepts of variable scope and return values. Initially, `num` is set to 10. The `increaseNumber` function increments `num` by 1 each time it's called and returns the original value of `num` before the increment occurs. So when `increaseNumber()` is invoked, it increases `num` from 10 to 11 but returns 10. This value, which is 10, is assigned to `num1`. Next, `increasePassedNumber` is a function that takes a number as an argument and increments that number, returning the original input value before the increment occurs. Here, `num1` (which is 10) is passed to this function. It effectively increments the value of `number` passed to it, so it receives 10, increments it, but returns the original value of 10. This is assigned to `num2`. Thus, when logging `num1`, we get 10 (the value returned by `increaseNumber` before the increment), and when logging `num2`, we also get 10 (the value passed to `increasePassedNumber