Mission 2 of 12 · Updated November 2026
Build an Interactive Task Manager
Model real data with arrays and objects, then build a task manager people can actually use: add, edit, complete and delete tasks, filter the list, validate the form, and keep everything after a refresh with localStorage. Write your first classes, and your first commits, branches and pull requests on GitHub.
By the end of this mission: “I can build a CRUD app with the DOM, validate user input, persist data, and manage my code with Git and GitHub.”
The tech stack for this mission
JavaScript
HTML5
CSS3
Git
GitHub
Chrome DevToolsWhat you learn, checkpoint by checkpoint
Checkpoint A
Model tasks with arrays, objects and a simple class
- Model a task as an object and the list as an array
- Transform data with map, filter and find
- Write your first class with a constructor and methods (basic OOP)
Checkpoint B
Create, update and delete tasks with DOM events and validated forms
- Render the task list into the page with DOM manipulation
- Handle clicks, submits and input with event listeners
- Validate form input and show helpful error messages
Checkpoint C
Filter the list, persist it with localStorage, and ship it via a pull request
- Filter tasks by status and handle the empty state
- Persist the list with localStorage so it survives a refresh
- Commit, branch and open a pull request on GitHub
AI companion mode · AI as Tutor
Most guidance · you still write first
Companion explains concepts, walks you through setup, and reviews your code. You still write the first draft and must explain what you shipped.
What proves you’re done
GitHub repo with branches and a merged pull request + working task manager + walkthrough
Every mission ships something real you can show. If you can’t explain it, you can’t submit it.
Deliberately left out of this mission
Advanced inheritance · SOLID · Design patterns · Complex algorithms
Depth is set on purpose: you master what this mission needs, not everything at once. The advanced material lives in optional self-study after Mission 12.
Reading is not building.
This mission is part of the paid 12-week programme - but the way we teach is free to try. The free trial puts you inside Sigmo, the learning portal our students use daily, with the 6 Projects in 6 Days precourse: real projects, real code, published to your own GitHub.
Start the free trialReady for the real thing?
The AI-Native Software Development Programme - all 12 missions with a live cohort, daily Buildroom, and mentors watching your back.