Create parallel function

[jlenon7]

Create a parallel function to run async process in parallel. Function parallel will receive three parameters:

• The array to be mapped.
• The async function that will run in each index of the array.
• The max number of parallel process that could be run. Will run all the array parallel if not set.

Ref:

Async map with limited parallelism in Node.js / Article Code

Example:

const users = [{ id: 1, name: 'test' }, { id: 2, name: 'test' }, { id: 3, name: 'test' }]
const fn = async (user, index) => {
    // make an http call to other API based on user id
    const orders = fetchUserOrders(user.id)

    // do something with orders
}

parallel(users, fn) // Will run all the array parallel
parallel(users, fn, 1) // Will wait the function finish and go to next index of the array
parallel(users, fn, 2) // Will run two index of the array in parallel