Should I use semicolons in JavaScript? [duplicate]

Answer 1

Use them. There are a few reasons why, most notably

1. JavaScript minifiers / compressors
2. Exceptions to the rule that a new line is a new expression (e.g. terminating a line with a variable and starting the next one with a parenthesis, ).)

Answer 2

They are required by the ECMAscript standard, see section 7.9 - it's just that the standard defines some rules that allow them to be automatically inserted while parsing the script.

So always use them!