Tips for patiently anticipating an object to undergo asynchronous modifications?

I have an array containing items, and I need to incorporate the asynchronous value from getProductMinQuantity.

The issue I'm facing is that the response with res.status(200)... gets sent before modifying item.order_quantity_minimum.

I had assumed using a map function like the one below would create a new promise with the updated items.

newResult is of type Promise<any>[] | undefined. Hence, I cannot use .then or .catch to properly handle my res.status within it.

const getCart = async () => {
  
  ...

  let newResult = result.data?.line_items.physical_items.map(async (item: any) =>
    item.order_quantity_minimum = await getProductMinQuantity(item.product_id)
  )

  res.status(200).json({
    data: result.data ? normalizeCart(result.data) : null,
  })
}

Any suggestions on how I can manage this effectively?

Answer №1

A common issue arises when attempting to utilize the await keyword within synchronous array methods like map, forEach, or filter. In such cases, it is recommended to opt for a for...of loop instead.

let updatedResults = []

for(let element of results.data?.line_items.physical_items) {
  element.minimum_quantity = await getProductMinimumQuantity(element.product_id)
  updatedResults.push(element);
}

// Perform operations on updatedResults

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