function add_1(x, y) {
return x + y;
}
console.log(add_1(1,2));
function add(x, y) {
var oldx = x, oldy = y;
if(typeof y === 'undefined') {
return function(newy) {
return oldx + newy;
};
}
return x + y;
}
console.log(add(1,2));
console.log(add(1)(2));