lexicalScope.js

function outer(){
  var variable1 = 'variable1'       
  const variable2 = 'variable2'   
  let variable3 = 'variable3'
    
   function inner() { 
     console.log(variable1)
     console.log(variable2)
     console.log(variable3)
   }
  inner()
}

outer()

// returns
// variable1
// variable2
// variable3