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CodeSignal

Functional Programming Patterns in JavaScript

via CodeSignal

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Overview

Adopt the functional mindset that powers modern JavaScript codebases. This course teaches closures, higher-order functions, immutable updates, currying, function composition, memoization, and modern collections (`Map`/`Set`). You'll learn to build small, composable utilities that combine into clean data pipelines.

Syllabus

  • Unit 1: Closures and Private State
    • Encapsulate the Counter
    • Fix the Call Tracker
    • Isolate Private Counter State
    • Build Your Own Function Factory
  • Unit 2: Higher Order Functions
    • From Loops to Pipelines
    • Fix the Grouping Logic
    • Build Flexible Sorting Tools
    • Master the Data Pipeline
  • Unit 3: Immutability and Pure Functions
    • Refactoring for Purity
    • Fix the Mutating Array
    • Safe Updates for Nested Data
    • Building a Pure Todo Manager
  • Unit 4: Currying and Composition
    • Curry Your Functions
    • Fix the Execution Flow
    • Build Your Functional Toolkit
    • Build a Reusable Pricing Pipeline
  • Unit 5: Memoization Maps and Sets
    • Modernize Your Private Cache
    • Fix the Function Cache
    • Streamline Your Data Collections
    • Build Your Performance Toolbox

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