Julia · Medium

Lesson 1 · On the house

Abstract types and hierarchies

abstract type, subtypes, Union{}, and dispatch on the tree.

Lesson 2

Multiple dispatch design

Interfaces via methods; own types or own functions — avoid piracy.

Lesson 3

Type stability deep dive

@code_warntype, concrete fields, and function barriers.

Lesson 4

Iteration protocol

iterate, for-desugar, and generators versus arrays.

Lesson 5

Metaprogramming essentials

:(), quote, Expr, and macros that transform code.

Lesson 6

Generated functions sketch

@generated methods: specialize on types, return quoted code.

Lesson 7

LinearAlgebra medium

Factorizations, mul!, and matrix views without copies.

Lesson 8

Tasks and Channels

@async/@sync, Channel put!/take!, and closing producers.

Lesson 9

Testing with Test.jl

@testset, @test, and @test_throws for expected errors.

Lesson 10

Profiling and allocation

@time, @allocated, Profile sketch, and cutting needless allocs.