Spiragram

want to show all string properties of an object in JavaScript?

function showAllStringPropertiesOf( object ) {
  for (var property in object) {
    if (typeof object[property] == "string") {
       console.log(property, ":", object[property]);
    }
  }
}

var object1 = {
      name: "Spiragram",
      address: "87 Beach Road",
      vision: "Spiragram will liberate, lead and inspire programmers to realize their full potential ..." 
    },
    object2 = {
      name: "Tien Dung",
      age: 26,
      saySomething: function () { alert("hello from " + this.name); }
     };

showAllStringPropertiesOf(object1);
showAllStringPropertiesOf(object2);

is it nice if we do not have to duplicate the function name? We can write:

forEach([object1, object2], showAllStringPropertiesOf );
 

where forEach is a funtion:

function forEach( a, fn ) {
  var i, l = a.length;
  for (var i = 0; i < l; i++)
    fn(a[i]);
};

is there a better way (because we have only two objects)? The answer is making the function chainable by adding a return itself command to the end of the function.

function showAllStringPropertiesOf ( ... ) {
  ...
  ...
  return arguments.callee;
}

showAllStringPropertiesOf( object1 )( object2 )

showAllStringPropertiesOf( object1 ).and ( object2 );

function showAllStringPropertiesOf ( ... ) {
  ...
  ...
  return addAndMagicTo(arguments.callee);
}

function addAndMagicTo( fn ) {
  fn.and = fn;
  return fn;
}

Tien Dung