js await in foreach code example

Example 1: foreach async typescript

for (const file of files) {
    const contents = await fs.readFile(file, 'utf8');
    console.log(contents);
  }

Example 2: async foreach

async function asyncForEach(array, callback) {
  for (let index = 0; index < array.length; index++) {
    await callback(array[index], index, array);
  }
}

asyncForEach([1, 2, 3], async (num) => {
  await waitFor(50);
  console.log(num);
})

Example 3: ts await foreach loop

async function printFiles () {
  const files = await getFilePaths();

  await Promise.all(files.map(async (file) => {
    const contents = await fs.readFile(file, 'utf8')
    console.log(contents)
  }));
}

Example 4: 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 5: foreach async not working

async function printFiles () {
  const files = await getFilePaths();

  for (const file of files) {
    const contents = await fs.readFile(file, 'utf8');
    console.log(contents);
  }
}

Example 6: js await in foreach

// Javascript will proceed to call the code that comes AFTER the forEach loop, 
// and then execute the code within the loop. This is because forEach is not 
// async-aware. YOU CANNOT USE AWAIT IN FOREACH. Use a regular for loop instead.