A designer I work with was presenting comps at a recent team meeting. She had done a wonderful job piecing together the concept for a design system, from

Because of a historical bug, typeof null in JavaScript returns “object” — so how do you check for null?

Almost everyone defaults to using mouse events such as mousedown and mouseup, but this is not ideal. Mouse events do not include things like touch and pen interactions and duplicating all your mouse events into touch events is not ideal either. This is where…