Products

Elementary | Middle
CodeHop Standards aligned coding for districts Tynker Gamified coding and apps Typing Easy to use typing for schools

Middle | High
CodeHS Pro Comprehensive CS platform Certifications Industry based credentials for CTE Cyber Range Interactive environment for cybersecurity labs

AI
AI Creator Easily create lessons with AI Vibe Coding Guided AI coding for students Bool AI coding and prototyping

Use Cases

Districts Schools Teachers

View All Products
Products Explore what CodeHS has to offer for districts, schools, and teachers
Platform

Teaching
Assignments Create & configure your course assignments Classroom Manage & organize your class Grading Streamline your grading workflow Academic Integrity Build a culture of honesty in your classroom QuizBuzz Run gamified, interactive quizzes with your class

Tools
Data Track & analyze student progress data Write Code Write, run, & debug code in a web-based IDE Integrations Connect CodeHS to your district's platform AI Tools The most complete AI toolkit in CS education LOGIC Measure student growth with pre- & posttests
Platform
Curriculum
Computer Science Curriculum

Customizable K-12 CS curriculum
Overview
Course Catalog

AP Courses

AI Courses

Interdisciplinary

Spanish Courses

AI Literacy

Digital Literacy

Cybersecurity
K-12 Pathways

Elementary School

Middle School

High School
Standards States Supplemental

Practice

Tutorials

Digital Textbooks
Curriculum Customizable K-12 Computer Science Curriculum
Professional DevelopmentPD

Professional Development

Online & in-person training to help teachers grow.
Overview

Online PD Courses In-Person & Virtual Workshops AI PD Free PD Events

PD Cohorts Teacher Certification Prep Microcredentials PD Membership
Professional Development Online & In-Person Training for Teachers
Online IDE
Online IDE

Write, run, & debug code right in your browser — no setup required.
Overview
Explore our languages

JavaScript

Python

Java

C++

SQL

HTML

Tracy

Blocks

p5.js
Start a new project

Open a blank sandbox in any language.
Online IDE Write, Run, & Debug Code in an Online IDE
- Online IDE
- JavaScript
- Python
- Java
- HTML
- C++
- SQL
- Karel
- Tracy
- Blocks
- p5.js
Resources

Company
About Learn about the CodeHS mission Privacy Center Our privacy & security practices Case Studies How schools succeed with CodeHS Testimonials What educators say about CodeHS

Community
Read Write Code Blog News & stories from CodeHS Coding in the Wild Real world coding stories CodeHS on X Posts & highlights from our feed Student Projects Explore projects built by students

Explore
States CS resources for your state Knowledge Base Help articles & how-tos Career Center Explore careers in tech
Resources

Request a Quote
Log In
Sign Up

New Sandbox Program

Click on one of our programs below to get started coding in the sandbox!

Java

JavaScript

Python 3

HTML

Karel

Turtle

Curriculum
Course Catalog
IB SL
Explore
17. Recursion
17.4 Recursion Quiz

Lesson 17.4

IB Computer Science Standard Level (2021)

Recursion Quiz

Jump to a lesson

View Syllabus Overview

Lesson 17.4 Recursion Quiz

Activities

These are all the activities included in the lesson

17.4.1 Recursion Quiz

Products

All Products
Coding LMS
CodeHS Pro
Computer Science Curriculum
Certifications
Professional Development
AI Creator
Typing
Cyber Range
Tynker
CodeHop

Plans

CodeHS Pro
CodeHS Free
Get a Quote

Use Cases

District
Schools
Teachers
CTE
Homeschool

Platform

Assignments
Classroom Management
Grading
Data
Online IDE
Integrations
AI Tools
Academic Integrity

Curriculum

Course Catalog
Project Catalog
K-12 Pathways
AP Courses
Elementary
State Courses
Spanish Courses
Standards
Hour of Code
Practice
Tutorials
Digital Textbooks
AP CSA Hub
AI Curriculum
Digital Literacy Curriculum

PD

Online PD Courses
In-Person PD Workshops
Virtual PD Workshops
Free PD Workshops
PD Cohorts
Teacher Certification Prep
Microcredentials
PD Membership

Programming Languages

New Sandbox Program
Javascript
Python
Java
HTML
C++
SQL
Karel

Resources

Why Computer Science
Why Cybersecurity
Why Learn AI
Why Digital Literacy
Back to School Checklist
Case Studies
States
Testimonials
Tweets
CodeHS Blog
Read Write Code Book
Knowledge Base
Webinars
Student Projects
Career Center
Student Alumni

CodeHS Has Everything

AI
Grading
Differentiation
Elementary
Assessments
Academic Integrity
Online IDE
Physical Computing
AP Courses
Vibe Coding
Yes

Company

About
Team
Careers
Privacy Center
AI Center
Terms
Privacy Policy
Security
Accessibility

Products

All Products
Coding LMS
CodeHS Pro
Computer Science Curriculum
Certifications
Professional Development
AI Creator
Typing
Cyber Range
Tynker
CodeHop

Plans

CodeHS Pro
CodeHS Free
Get a Quote

Platform

Assignments
Classroom
Grading
Data
Online IDE
Integrations
AI Tools
Academic Integrity

PD

Online PD Courses
In-Person PD Workshops
Virtual PD Workshops
PD Cohorts
Teacher Certification Prep
Microcredentials

Resources

Why Computer Science
Why Cybersecurity
Why Learn AI
Why Digital Literacy
Back to School Checklist
Case Studies
States
Testimonials
Tweets
CodeHS Blog
Read Write Code Book
Knowledge Base
Webinars
Student Projects
Career Center
Student Alumni

Use Cases

District
Schools
Teachers
CTE
Homeschool

Curriculum

Course Catalog
Project Catalog
AP Courses
Elementary
State Courses
Spanish Courses
Standards
Practice
Tutorials
Digital Textbooks
AP CSA Hub

Programming Languages

New Sandbox Program

Javascript
Python
Java
HTML
C++
SQL
Karel

CodeHS Has Everything

AI
Grading
Differentiation
Elementary
Assessments
Academic Integrity
Online IDE
Physical Computing
AP Courses
Vibe Coding
Yes

Company

About
Team
Careers
Privacy Center
AI Center
Terms
Privacy Policy
Security
Accessibility

CodeHS Certified Educators CodeHS Educator Facebook Group CodeHS Store