Mojo

A Python superset, that also includes system programming features.

They released a local Mac installation this week (2023-10-18) and I tried it out on my laptop. The VSCode extension is still a little buggy.

New language constructs learnt include:

Ownership Syntax

Syntax	Notes	Comments
inout	Mutable	The reason it’s called this is because the mutations on the argument inside the function visible outside the function
borrowed	Immutable reference	The default semantic, and doesn’t need to be declared.
owned	Ownership	Rust uses this as the default semantic.

Variable initialization

There are three ways to initialize a variable:

Initialization Method	Syntax	Notes
Python-style	x = 1	To be used in def-declared functions only
Using let	let x = 1	Denotes an immutable variable
Using var	var x = 1	Denotes a mutable variable

Function Declaration

Declaration Method	Notes
def	Python-style. No strict enforcement of types and internal variable declarations
fn	Requires Mojo-type hints to be specified, and internal variable declarations to use either let or var.