04 / LANGUAGES

Languages

JavaScript in depth first: twelve reference sheets on the parts of the language interviews actually probe. Then eight more languages on the same five-step path (intro, OOP, routing, models, API), rewritten from the 2021 cohort guides and re-verified against each language's current documentation, with Railway replacing Heroku for deployment. The frontend four follow the same list/show/create walkthrough against the API you build.

Start here 67 pages · 10 groups

JavaScript

13 pages

Twelve runnable sheets: arrays, strings, Map/Set, numbers, objects, classes, closures, async, regex, coercion and errors.

JavaScript12 sheets
Arrays10 sections
Sorting (comparators)10 sections
Strings10 sections
Map & Set9 sections
Numbers & Math8 sections
Objects & destructuring9 sections
Classes & this7 sections
Closures, scope & hoisting10 sections
Async & Promises0 sections
Regex12 sections
Equality & coercion gotchas9 sections
Errors, generators & misc8 sections

Python

6 pages

Django, re-verified against docs.python.org and docs.djangoproject.com.

Python5 steps
Python · Intro to the languageStep 1
Python · OOPStep 2
Python · Django: setup and routingStep 3
Python · Django: models and migrationsStep 4
Python · Django: building and deploying an APIStep 5

Ruby

6 pages

Rails, re-verified against docs.ruby-lang.org and guides.rubyonrails.org.

Ruby5 steps
Ruby · Intro to the languageStep 1
Ruby · OOPStep 2
Ruby · Rails: setup and routingStep 3
Ruby · Rails: models and migrationsStep 4
Ruby · Rails: building and deploying an APIStep 5

Go

6 pages

chi, re-verified against go.dev and github.com/go-chi/chi.

Go5 steps
Go · Intro to the languageStep 1
Go · OOP in an OOP-less worldStep 2
Go · chi: setup and routingStep 3
Go · chi and pgx: models and migrationsStep 4
Go · chi: building and deploying an APIStep 5

Java

6 pages

Spring Boot, re-verified against docs.oracle.com and docs.spring.io.

Java5 steps
Java · Intro to the languageStep 1
Java · OOPStep 2
Java · Spring Boot: setup and routingStep 3
Java · Spring Boot: models and migrationsStep 4
Java · Spring Boot: building and deploying an APIStep 5

C#

6 pages

ASP.NET Core and Entity Framework Core, re-verified against learn.microsoft.com.

C#5 steps
C# · Intro to the languageStep 1
C# · OOPStep 2
C# · ASP.NET Core / Entity Framework Core: setup and routingStep 3
C# · ASP.NET Core / Entity Framework Core: models and migrationsStep 4
C# · ASP.NET Core / Entity Framework Core: building and deploying an APIStep 5

PHP

6 pages

Laravel, re-verified against php.net and laravel.com/docs.

PHP5 steps
PHP · Intro to the languageStep 1
PHP · OOPStep 2
PHP · Laravel: setup and routingStep 3
PHP · Laravel: models and migrationsStep 4
PHP · Laravel: building and deploying an APIStep 5

Rust

6 pages

Axum, re-verified against doc.rust-lang.org and docs.rs/axum.

Rust5 steps
Rust · Intro to the languageStep 1
Rust · OOP in an OOP-less worldStep 2
Rust · Axum: setup and routingStep 3
Rust · Axum and SQLx: models and migrationsStep 4
Rust · Axum: API routes and CORSStep 5

Dart

6 pages

shelf, re-verified against dart.dev and pub.dev.

Dart5 steps
Dart · Intro to the languageStep 1
Dart · OOPStep 2
Dart · shelf: setup and routingStep 3
Dart · shelf: models and migrationsStep 4
Dart · shelf: building and deploying an APIStep 5

Frontend

6 pages

React, Vue, Angular and Svelte walkthroughs plus the React cheatsheet, each rewritten for the current major.

LANGUAGE SWITCHER

Every language page carries this switcher and keeps you on the same step when you change language.