Can someone please explain this snippet?

So obviously there is a knowledge gap in my basics and hence can't figure this out-const validate = validations => {return async (req, res, next) => {console.log('check 3')await Promise.all(validations.map(validation => validation.run(req)));const errors = validationResult(req);if (errors.isEmpty()) {return next();    }res.status(400).json({ errors: errors.array() });  };};​This is being called byapp.post('/api/create-user', validate([body('email').isEmail(),body('password').isLength({ min: 6 })]), async (req, res, next) => {// request is guaranteed to not have any validation errors.res.send("succ")});the body() function inside validate in app.post is from express-validator​Now, how is app.post calling that middleware function const validate? I don't understand how the arguments are passing.validations is the argument list there which should receive validate([body('email').isEmail(),body('password').isLength({ min: 6 })])right?But how is another brace opening saying return async (req, res, next) => { the first 2 lines are where my confusion isconst validate = validations => {return async (req, res, next) => {

Submitted October 01, 2020 at 11:59AM by kjroger94