How do I start and end JavaScript programs?

Question

New JavaScript coder here. I’m trying to make my very 1st program. But I don’t know what to type for the start & end of my JavaScript program.
Can anyone give me the answer?

Answer 1

JavaScript doesn't use an entry or exit function. It reads all your variables, and executes your code top to bottom using a JIT (Just in time) compiler.

Write anything that you know, even if it's just
alert("Hello World!")