The setTimeout call in it re-schedules itself with zero delay. In the browser, there’s a limitation of how often nested timers can run. When you use await, you expect JavaScript to pause execution until the awaited promise gets resolved. We'll look at how await affects forEach, map, and filter in the next few sections. Examples of such loops that require a fallback include forEach, map, filter, and reduce. 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. The built-in function setTimeout uses callbacks. 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. Here, The body of the loop is executed at first. Each call remembers the real time from the previous one in the times array. Node can do nothing while this loop is ticking. I just want to slow my for loop so you can visually notice each iteration. Essentially in JavaScript there is no way to pause a running loop. JavaScript wait() To make JavaScript wait, use the combination of Promises, async/await, and setTimeout() function through which you can write the wait() function that will work as you would expect it should. 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). ; If the condition evaluates to true, the body of the loop inside the do statement is executed again. In contrast to the break statement, continue does not terminate the execution of the loop entirely. Just like JavaScript for, for in, do, do while loops. ; This process continues until the condition evaluates to false. condition An expression evaluated after each pass through the loop. 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. Await in a forEach loop. However, you can only call this custom wait() function from within async functions, and you need to use the await keyword with it. ; If the condition evaluates to true, the body of the loop inside the do statement is executed again. This returns the number of milliseconds passed since the Epoch time. 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.. Then the condition is evaluated. do statement while (condition); statement A statement that is executed at least once and is re-executed each time the condition evaluates to true. The result is what you’d expect. Then only i should send next frame. 'Start' 'Apple: 27' 'Grape: 0' 'Pear: 14' 'End' This behaviour works with most loops (like while and for-of loops)… Like above example we set a delay to display a message for a spacific times. Create a promise-based alternative. The function delay(ms) should return a promise. But it won't work with loops that require a callback. An infinite while loop is started. This means awaits in a for-loop should get executed in series. 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. 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. That promise should resolve after ms milliseconds, so that we can add .then to it, like this: The delay parameter you pass to these functions is the minimum delay time to execute the callback. ; The condition is evaluated once again. This flag is set when a System.threading.timer expires. 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