Middlewares - a way to facilitate third party extension points around a framework's core operations

hideMonkeyPatching.js

// original method
function canBeEnhancedLater (x) {
  return x
}

// enhancement modules
function double (next) {
  return function (x) {
    return next(2 * x)
  }
}

function square (next) {
  return function (x) {
    return next(x * x)
  }
}

// enhancement stack
const operations = [double, square]

// internal method to apply enancement
function performEnhancements (operations) {
  for (operation of operations) {
    // monkey patching
    canBeEnhancedLater = operation(canBeEnhancedLater)
  }
}

performEnhancements(operations)
canBeEnhancedLater(5) // 50 -> 5 | square | double | identity (original)