# Overview

- Comment operator
`⍝`

- Division
`÷`

- Multiplication
`×`

- Unary minus:
`¯`

Evaluation is strictly left to right, always.

- Assignment is done with
`←`

- Unit operator
`⊢`

returns val of expression - IO operator
`⎕`

print with `⎕ ←`

It’s arrays all the way down — Learning APL

- APL is an
*array programming language* - APL only deals in arrays; it is the only data structure
- arrays can be many things though, from math: matrices, vectors, from programming: string, list