Apple - Is there a Mac equivalent for window snapping?
Depending on your technical inclination, you might want to try Spectacle, or install something like Mjolnir / HammerSpoon
BetterTouchTool (blog.boastr.net) does just this. I find it very convenient to use with a trackpad: by tapping in different parts of the trackpad I can snap windows to the corresponding region of the screen, one of the most useful features of BetterTouchTool (but it has many many more, check it out!)
Edit: BetterTouchTool is no longer free