javascript await in loop code example

Example 1: async for loop

(async function loop() {
    for (let i = 0; i < 10; i++) {
        await new Promise(resolve => setTimeout(resolve, Math.random() * 1000));
        console.log(i);
    }
})();

Example 2: C# foreach loop async but wait at end

public async Task RunAsync()
{
    var tasks = new List<Task>();
 
    foreach (var x in new[] { 1, 2, 3 })
    {
        var task = DoSomethingAsync(x);
        tasks.Add(task);
    }
 
    await Task.WhenAll();
}

Example 3: loop async javascript

const mapLoop = async _ => {
  console.log('Start')

  const numFruits = await fruitsToGet.map(async fruit => {
    const numFruit = await getNumFruit(fruit)
    return numFruit
  })

  console.log(numFruits)

  console.log('End')
}

Example 4: loop async javascript

const forEachLoop = _ => {
  console.log('Start')

  fruitsToGet.forEach(async fruit => {
    const numFruit = await getNumFruit(fruit)
    console.log(numFruit)
  })

  console.log('End')
}