Not a real story, but in theory a missing semicolon in javascript can lead to unexpected results. The semi-colon is optional but missing it will cause issue if the following line starts with an opening bracket (and maybe other chars too). For instance:
foo will be the array, as expected. But forget the semicolon and foo is assigned the return of forEach, a.k.a undefined. The syntax is valid, but is not evaluated to what you would naively expect.
