Assuming the hypothetical "async" function is completely unmodifiable library code, what can I do in "myFunc" to ensure that "a" gets properly set to "step 2" before the function returns?

Asynchronous programming in JavaScript leverages features like callbacks, promises and async/await to sidestep this issue by allowing other code to run in the meantime.

While JavaScript itself is single-threaded, many JavaScript functions have supported asynchronous processing through callbacks (the variations on the jQuery AJAX function are just the most obvious ...