Executing Async loop in sequence using Generator Functions in NodeJS

asyncLoop.js

function* generatorFn(arr = [], asyncFn) {
    for(let item of arr) {
        // Alter this function according to your needs. 
        // Also note that the below code would remain the same even in case of async-await functions
        yield asyncFn(item)
    }
}

async function execSequentially(arr, asyncFn) {
    let gen = generatorFn(arr, asyncFn)
    
    let result = gen.next();
    while(!result.done) {
        let val = await result.value
        console.log(val)

        result = gen.next()
    }
}


function asyncFn(item){
    // Random timeout is used just to confirm the true sequentialization of Async loop
    return new Promise(resolve => setTimeout(resolve, 1000 + 100, item))
}
// This would go through the entire array creating a timeout for each item, 
// but would execute the timeout one-after-the-other (sequentially)
execSequentially([123,2,3,4], asyncFn)

This solves the case where the code looks like below:
[1,2,3,4].forEach(async i => { await new Promise(resolve => setTimeout(resolve, Math.random() * 1000 + 100, item)) })

If you execute the above code you may find different item being printed in unordered sequence.
But instead if you use the above gist, then order would be sequential