Ad

Why Do I Need To Use A Callback Is This Case

- 1 answer

I'm trying to work out the Coinbase Pro node.js API.

When running this:

const buyParams = {
  price: '100.00', // USD
  size: '1', // BTC
  product_id: 'BTC-USD',
};
authedClient.buy(buyParams, callback);

I have the following error callback is not defined

So I'm trying to understand how does callback work exactly.

What is the callback here exactly? If I understand well I need to define the callback which is a function but what would be the purpose of this function? I this because I need to wait for the answer from authedClient method? Or this something else?

Ad

Answer

.buy method will call provided callback when it finishes.
You probably want to do something depending on the result.
That's why you need that callback.

Ad
source: stackoverflow.com
Ad