Can you please break down this function in a straightforward way (without using arrows)? I'm having trouble understanding if "foo" in Promise.resolve "foo" is an argument or a callback function.
module.exports = function foo(req, res, next) {
return Promise.resolve(foo(req, res, next)).catch(function(err) {
next(err);
});
}
If you're already familiar with the workings of Promise.resolve, then I'll focus on explaining the aspect related to 'foo'.
But why not just cover everything while we're at it?
Promise.resolve creates a promise that resolves immediately with the provided value.
For example, consider this code snippet:
Promise.resolve(2 * 2)
.then(function(value) {
console.log('Value received is ', value);
});
You would promptly see a message in the console saying Value received is 4
foo(req, res, next)
The function foo utilizes the three callback functions: req, res, and next
Here's what happens:
Promise.resolve(foo(req, res, next)).catch(function(err) { next(err) })
If we rewrite it without arrow functions:
Promise.resolve(foo(req, res, next))
.catch(function(err) {
return next(err)
});
This process involves taking the 'result' from the function call
foo(req, res, next)
and passing it to the Promise.resolve function, which returns a Promise resolving to that 'result'.
The .catch method handles any errors during the foo function call and forwards them to the next callback for processing.
I hope this clears up any confusion you may have had.
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