Javascript is an imperative language, in the C family. Code consists of lists of statements usually ending in a semi-colon (;). Semicolons are optional but since they are inserted automatically, sometimes in particular cases they can mess up code.

Comments are like in C++ (// single-line, and /*+*/ multi-line).

Prettier

A good way not to fight semicolons (and many other style aspects) is to use a formatter like Prettier. Associating a key with formatting code and formatting it automatically often leads to consistent code in projects.