promises[callback ]

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 https://www.youtube.com/watch?v=ap-6PPAuK1Y&t=2090s




inversion of control:

so this code:-----------
const promise=createOrder(cart)
promise is in empty object[asynchronous call]
{data:undefined}[property untill the value is not there]
after some time data will be filled with data...orderdetail





.................................................................................................................................................
resolve just once  immutable

promise is an object representing the eventual completion of asynchronous operation.









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