TypeScript Project: Group By Category Board

GENERAL PROJECT

TypeScript Project: Group By Category Board

Planned

PROJECT 036 — Data Transformation
Move loose records into category columns automatically.

Project TypeScript Project: Group By Category Board Preview coming soon

PROJECT 036

TypeScript Project: Group By Category Board

Concept

Map collections efficiently build groups while processing each record once.

Concept

Map collections efficiently build groups while processing each record once.

Objective & Explanation

What the project should make visible and why the concept matters.

Learning Target

Objective

Move loose records into category columns automatically.

Explanation

Map collections efficiently build groups while processing each record once.

Project Plan

Structure, technologies, data boundary, and source connection.

Structure

project/
├── package.json
├── tsconfig.json
├── index.html
├── styles.css
└── src/
    └── app.ts

Technologies

TypeScript
HTML
CSS
JSON

Data Layer

Use a small local object, array, or JSON fixture so the transformation stays visible.

Sandbox Source

src/generator/generate.ts → groupRecordsByCategory()

Build Instructions

Build only the focused behavior, then use the visual layer to inspect it.

Setup

Create the standalone project folder and listed files.

Implement

Implement the smallest version that demonstrates the concept.

Run & Inspect

Change one input and observe the visible output change.

Code & Configuration

Starter configuration plus the focused implementation example.

Focused TypeScript

Implement this behavior first, then alter the input.

const groups = new Map<string, Project[]>();

for (const project of projects) {
  const key = project.category;
  const group = groups.get(key) ?? [];
  group.push(project);
  groups.set(key, group);
}

Starter Configuration

Keep the project independently buildable.

package.json

{
  "type": "module",
  "scripts": { "build": "tsc" },
  "devDependencies": { "typescript": "^7.0.2" }
}

tsconfig.json

{
  "compilerOptions": {
    "rootDir": "./src",
    "outDir": "./dist",
    "target": "ES2022",
    "module": "ES2022",
    "lib": ["ES2022", "DOM"],
    "strict": true,
    "sourceMap": true
  },
  "include": ["src/**/*.ts"]
}

Expected Visual Result

The output is the proof that the concept is working.

Visible Proof

The browser should visibly demonstrate: move loose records into category columns automatically.

Data: JSON