loop async javascript

1const dummyfunction = async () => {
2	for (item of items) {
3      	// Until promise returns,
4      	// The loop waits here!
5      	await turtle();
6    }
7}

1// Series loop
2async (items) => {
3  for (let i = 0; i < items.length; i++) {
4  	
5    // for loop will wait for promise to resolve
6    const result = await db.get(items[i]);
7    console.log(result);
8  }
9}
10
11// Parallel loop
12async (items) => {
13  let promises = [];
14  
15  // all promises will be added to array in order
16  for (let i = 0; i < items.length; i++) {
17    promises.push(db.get(items[i]));
18  }
19  
20  // Promise.all will await all promises in the array to resolve
21  // then it will itself resolve to an array of the results. 
22  // results will be in order of the Promises passed, 
23  // regardless of completion order
24  
25  const results = await Promise.all(promises);
26  console.log(results);
27}

1async function processArray(array) {
2  // map array to promises
3  const promises = array.map(delayedLog);
4  // wait until all promises are resolved
5  await Promise.all(promises);
6  console.log('Done!');
7}

1const mapLoop = async _ => {
2  console.log('Start')
3
4  const numFruits = await fruitsToGet.map(async fruit => {
5    const numFruit = await getNumFruit(fruit)
6    return numFruit
7  })
8
9  console.log(numFruits)
10
11  console.log('End')
12}
13