Hidden Dependency ↔ External outer scope variable or invoking external function

Hidden Dependency can be moved into input Argument to turn into Pure Function

function add(a, b, c, log) {
  log(a, b)
  return a + b + c;
}

package & defer impurity to inner function

function addFunc(c, log) {
  function add(a, b) {
    log(a, b)
    return a + b + c
  }
  return add
}

References

1. Side Effect ↔ Effect with external Hidden Dependency that read/writes to External System