SOURCE

let middleware = []
middleware.push((next) => {
	console.log(1)
	next()
	console.log(1.1)
})
middleware.push((next) => {
	console.log(2)
	next()
	console.log(2.1)
})
middleware.push((next) => {
    console.log(3)
	next()
	console.log(3.1)
})
 
let fn = compose(middleware)
fn()
// /*
// 1
// 2
// 3
// 3.1
// 2.1
// 1.1
// */

function compose (middleware) {
    return function() {
        dispatch(0)
        function dispatch(i) {
            const fn = middleware[i]
            if(!fn) return null
            fn(function next() {
                dispatch(i+1)
            })
        }
        

    }
}