The built-in function setTimeout uses callbacks. ; The condition is evaluated once again. Essentially in JavaScript there is no way to pause a running loop. ; If the condition evaluates to true, the body of the loop inside the do statement is executed again. In the browser, there’s a limitation of how often nested timers can run. I just want to slow my for loop so you can visually notice each iteration. The HTML5 standard says: “after five nested timers, the interval is forced to be at least 4 milliseconds.”.. Let’s demonstrate what it means with the example below. Create a promise-based alternative. ; If the condition evaluates to true, the body of the loop inside the do statement is executed again. Each call remembers the real time from the previous one in the times array. condition An expression evaluated after each pass through the loop. The function delay(ms) should return a promise. An infinite while loop is started. When you use continue without a label, it terminates the current iteration of the innermost enclosing while, do-while, or for statement and continues execution of the loop with the next iteration. We'll do the same thing as we did in the for-loop example. Examples of such loops that require a fallback include forEach, map, filter, and reduce. Like above example we set a delay to display a message for a spacific times. We'd like a delay in between. This flag is set when a System.threading.timer expires. The continue statement can be used to restart a while, do-while, for, or label statement.. I have looked all over and everywhere people are mentioning setTimeout, but that only causes a delayed start of a function.. The delay parameter you pass to these functions is the minimum delay time to execute the callback. We'll look at how await affects forEach, map, and filter in the next few sections. Just like JavaScript for, for in, do, do while loops. The result is what you’d expect. To execute multiple statements within the loop, use a block statement ({ ... }) to group those statements. Then the condition is evaluated. In contrast to the break statement, continue does not terminate the execution of the loop entirely. When you use await, you expect JavaScript to pause execution until the awaited promise gets resolved. Method 1: Using an infinite loop to keep checking for the elapsed time The time that the sleep function starts is first found using the new Date().getTime() method. Please see the do while loop , i have added that because i have to wait until a timer expires and _stMinExpired is set to true. Node can do nothing while this loop is ticking. But it won't work with loops that require a callback. The 1e10 is 1 with 10 zeros in front of it, so the loop is a 10 Billion ticks loop (which basically simulates a busy CPU). This returns the number of milliseconds passed since the Epoch time. This of course is a very bad thing to do in practice, but it’ll help you here to understand that setTimeout delay is not a guaranteed thing, but rather a minimum thing. That promise should resolve after ms milliseconds, so that we can add .then to it, like this: The code works fine and does what I want it to do, but the for loop executes so quickly that you don't notice the change in opacity. Await in a forEach loop. ; This process continues until the condition evaluates to false. 'Start' 'Apple: 27' 'Grape: 0' 'Pear: 14' 'End' This behaviour works with most loops (like while and for-of loops)… do statement while (condition); statement A statement that is executed at least once and is re-executed each time the condition evaluates to true. This means awaits in a for-loop should get executed in series. 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