What are uses/significance of "@" and "!" in Julia

New to Julia
,
1

I am new to Julia and working on a project written in Julia.
What are uses/significance of “@” and “!” in Julia?

2

@ is used for macro names in macro invocations. ! is just a habit to show that the function will change a mutable input.

4 Likes
3

! can also mean something else than the aforementioned convention:

julia> @doc !
  !(x)

  Boolean not. Implements three-valued logic (https://en.wikipedia.org/wiki/Three-valued_logic), returning
  missing if x is missing.

  See also ~ for bitwise not.

  Examples
  ≡≡≡≡≡≡≡≡≡≡

  julia> !true
  false

  julia> !false
  true
2 Likes