Javascript symbol-to-proc

gistfile1.js

String.prototype.__defineGetter__('proc', function() {
  var prop = this;
  return function(obj) {
    if(typeof obj[prop] == 'function')
      return obj[prop]();
    
    return obj[prop];
  }
});

// Usage:

var people = /* ... */;
people.map('name'.proc); // ["bob", "jill", ...}