func_var_params.js

console.log("Begin example - 6");
// Adding of three numbers using a function

// Define an add function that can work for three or less arguments
function add(a,b,c){
	var d = ( (a) ? a : 0 )  +  // Using ternary operator we can check the
		( (b) ? b : 0 )  +  // Truthy/Falsy of the parameter and then 
		( (c) ? c : 0 ) ;   // Substitue with numeral zero so that NaN is avoided.
	return d;
}

var result1 = add(1);
console.log("Result 1 =" + result1);

var result2 = add(10,20);
console.log("Result 2 =" + result2);

var result3 = add(100,200,300);
console.log("Result 3 =" + result3);