Record

Work with objects and dictionaries functionally

What is Record?

Record provides functional utilities for working with JavaScript objects (key-value pairs). Transform, filter, and manipulate objects immutably with full type safety. Perfect for configuration objects, dictionaries, and any key-value data.

// Instead of this:
const result = {}
for (const key in obj) { result[key] = ... }

// Use this:
const result = pipe(obj, R.map(...), R.filter(...))
map
filter
collect
lookup
modify
🔒

Immutable

Transform objects without mutation

✅

Type-Safe

Full TypeScript type inference

⚙️

Functional

Map, filter, reduce over objects

📦

Practical

Perfect for configs and data

Record in Action

❌ Manual Object Iteration

const result: Record<string, number> = {}
for (const key in obj) {
  result[key] = obj[key] * 2
}

// Mutations, verbose
// Error-prone

✅ Record Operations

const result = pipe(
  obj,
  R.map(value => value * 2)
)

// Immutable, functional
// Type-safe transformations

Practice Exercises

1

Map

Learn about map in fp-ts record

beginnerStart
2

Filter

Learn about filter in fp-ts record

beginnerStart
3

Collect

Learn about collect in fp-ts record

beginnerStart
4

Lookup

Learn about lookup in fp-ts record

intermediateStart
5

Modify

Learn about modify in fp-ts record

intermediateStart
6

Keys Values

Learn about keys values in fp-ts record

intermediateStart
7

Merge

Learn about merge in fp-ts record

advancedStart
8

Pipeline

Learn about pipeline in fp-ts record

advancedStart

Why Learn Record?

📝

Master Record

Learn the fundamental concepts and patterns that make Record powerful

💪

8 Exercises

Practice with hands-on exercises from beginner friendly level

🚀

Production Ready

Apply Record patterns to build robust, type-safe applications