1function sum( obj ) {
2  var sum = 0;
3  for( var el in obj ) {
4    if( obj.hasOwnProperty( el ) ) {
5      sum += parseFloat( obj[el] );
6    }
7  }
8  return sum;
9}
10    
11var sample = { a: 1 , b: 2 , c:3 };
12var summed = sum( sample );
13console.log( "sum: "+summed );