I have an object in js: `{x: 0, y: 0}`, and I want to increment both x and y by one. Now, this isn't a big object, so I can just use `placeholder.x` and `placeholder.y`, not very hard. But if I wanted to add more things to the object, the code would get very long and repetitive, so is there a shorter way to apply functions or math to everything in an object?