async await in forloops

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showing results for - "async await in forloops"
Nessa
09 May 2017
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}
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