Admittedly, using emojis doesn’t seem very useful, but using Greek letters to write equations really makes Julia a great mathematical language:

σ =3δ =πϕ =8(5σ +3δ) / ϕ

3.0530972450961724

Note how the multiplication operator can be omitted when this does not lead to confusion. Also note how the mathematical constant π is available in Julia without having to load any module.

If you want to know how to type a symbol, ask Julia: type ? and paste it in the REPL.

The only hard rules for variable names are:

They must begin with a letter or an underscore,

They cannot take the names of built-in keywords such as if, do, try, else,

They cannot take the names of built-in constants (e.g. π) and keywords in use in a session.

## Comments

Comments do not get evaluated by Julia and are for humans only.