function concatStrings() {

var str = "";

//console.log(arguments);

for(var i = 0; i < arguments.length; i++) {

str += arguments[i] + " ";

}

console.log(str);

}

concatStrings("hello", "world", "is", "a", "string");

function addNumbers() {

var sum = 0;

for(var i = 0 ; i < arguments.length; i++) {

sum += arguments[i];

}

console.log(sum);

}

var myObj = {};

myObj.color = 'green';

myObj.changeColor = function(newColor) {

this.color = newColor;

}

var myClass = function() {

this.color = 'green';

var color2 = 'blue';

this.changeColor = function(newColor) {

this.color = newColor;

console.log(this.color);

console.log(color2);

}

};

myClass.color3 = 'red';