scope_property_by_reference.js

var a = 'global'

function outer () {
  var b = 'outer'
  
  return function inner () {
    var c = 'inner'
    
    console.log('a:', a)
    console.log('b:', b)
    console.log('c:', c)
  }
}

var innerFunc = outer()

a = 'GLOBAL'

innerFunc()

// a: GLOBAL
// b: outer
// c: inner