; If the condition evaluates to true, the body of the loop inside the do statement is executed again. 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. Await in a forEach loop. I just want to slow my for loop so you can visually notice each iteration. But it won't work with loops that require a callback. The function delay(ms) should return a promise. The setTimeout call in it re-schedules itself with zero delay. That promise should resolve after ms milliseconds, so that we can add .then to it, like this: We'd like a delay in between. Each call remembers the real time from the previous one in the times array. Essentially in JavaScript there is no way to pause a running loop. 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. The continue statement can be used to restart a while, do-while, for, or label statement.. However, you can only call this custom wait() function from within async functions, and you need to use the await keyword with it. 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 built-in function setTimeout uses callbacks. 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. 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). 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 look at how await affects forEach, map, and filter in the next few sections. In contrast to the break statement, continue does not terminate the execution of the loop entirely. The delay parameter you pass to these functions is the minimum delay time to execute the callback. Node can do nothing while this loop is ticking. To execute multiple statements within the loop, use a block statement ({ ... }) to group those statements. This returns the number of milliseconds passed since the Epoch time. condition An expression evaluated after each pass through the loop. We'll do the same thing as we did in the for-loop example. do statement while (condition); statement A statement that is executed at least once and is re-executed each time the condition evaluates to true. Like above example we set a delay to display a message for a spacific times. 'Start' 'Apple: 27' 'Grape: 0' 'Pear: 14' 'End' This behaviour works with most loops (like while and for-of loops)… An infinite while loop is started. This flag is set when a System.threading.timer expires. ; The condition is evaluated once again. In the browser, there’s a limitation of how often nested timers can run. 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. Just like JavaScript for, for in, do, do while loops. I have looked all over and everywhere people are mentioning setTimeout, but that only causes a delayed start of a function.. The result is what you’d expect. Examples of such loops that require a fallback include forEach, map, filter, and reduce. When you use await, you expect JavaScript to pause execution until the awaited promise gets resolved. 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