// Code in the global scope has access to variable `g`

// but not `o` nor `i`.

var g = 'global';

​

function outer () {

  // Code in this function scope has access to variables

  // `o` and `g`

  // but not `i`.

  var o = 'outer';

  function inner () {

    // Code in this function scope has access to variables

    // `i`, `o` and `g`.

​

    var i = 'inner';

  }

}

​