#Lambda - Async Code Parallel Execution

lambda-parallel.js

// This lambda function will not timeout during a 3sec, since all 3 background processes happening at the same time

const hello1 = () => {
    return new Promise(resolve => {
        setTimeout(() => resolve(console.log('Hello from Hello1')), 2000)
    })
}

const hello2 = () => {
    return new Promise(resolve => {
        setTimeout(() => resolve(console.log('Hello from Hello2')), 2000)
    })
}

const hello3 = () => {
    return new Promise(resolve => {
        setTimeout(() => resolve(console.log('Hello from Hello3')), 2000)
    })
}

exports.lambda_handler = async(event, context, callback) => {

    try {
        console.log('step 1')
        const h1 = hello1()
        const h2 = hello2()
        const h3 = hello3()
        await h1
        await h2
        await h3
        console.log('step 3')

        return 'Hello from Lambda'

    }
    catch (err) {
        console.log(err)
        return 'Something went wrong'
    }

}