v8/test/mjsunit/global-accessors.js

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// Test accessors on the global object.

var x_ = 0;

this.__defineSetter__('x', function(x) { x_ = x; });
this.__defineGetter__('x', function() { return x_; });

this.__defineSetter__('y', function(x) { });
this.__defineGetter__('y', function() { return 7; });

function f(a) {
  x = x + a;
  return x;
}

function g(a) {
  y = y + a;
  return y;
}

assertEquals(1, f(1));
assertEquals(3, f(2));

assertEquals(7, g(1));
assertEquals(7, g(2));