Salesforce JavaScript Developer Practice Exam

What will be the console order of output for the provided asynchronous code snippet?

1. 51324

2. 15234

3. 53124

4. 14523

The correct answer is: 53124

To understand why the output of the asynchronous code snippet results in the order being 53124, it's essential to grasp how JavaScript handles asynchronous operations, particularly with the use of `setTimeout` and the event loop. In JavaScript, when code execution encounters a `setTimeout` function, it schedules the callback to be executed after a specified delay but doesn't pause the execution of the next lines of code. Instead, it continues executing the subsequent lines while the callback is waiting in a queue until the specified time has elapsed. Given the asynchronous nature of the `setTimeout` function, the operations that run immediately (without `setTimeout`) will be completed first before any delayed operations are executed. In a typical situation where a numeric operation is performed, and then `setTimeout` is invoked for subsequent statements, you can expect the following sequence: 1. The first synchronous operation executes, logging "5". 2. The second synchronous operation executes, logging "3". 3. The first `setTimeout` may be executed (if it has the shortest delay) which would log "1". 4. Then, the second `setTimeout` logs "2" afterward. 5. Finally, once all synchronous code has run, the last asynchronous call to