Many of these are: 1) Much less legible, and in some cases outright lazy 2) Extremely vulnerable to Javascript's fast-and-loose type checking. However it's go

Many of these are: 1) Much less legible, and in some cases outright lazy 2) Extremely vulnerable to Javascript's fast-and-loose type checking. However it's good to be AWARE of them, since you tend to see them a lot in team projects.