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CodeSignal

Higher-Order Functions and Functional Style in Haskell

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Overview

Learn Haskell’s core idiom: higher-order functions. Replace manual recursion with `map`, `filter`, `fold`, lambdas, partial application, and clear function-composition pipelines.

Syllabus

  • Unit 1: Functions and Partial Application
    • Applying Functions Twice
    • Building Smaller Functions from Bigger Ones
  • Unit 2: Transforming Lists with map
    • Doubling Numbers with map
    • Marking Big Numbers with Partial Application
    • Shouting Strings with map
  • Unit 3: Selecting Elements with Filter
    • Picking Out the Even Numbers
    • Keeping Only the Big Numbers
    • Filtering with Your Own Predicate
  • Unit 4: Anonymous Functions with Lambdas
    • Tripling Numbers with a Lambda
    • Filtering Multiples with a Lambda
  • Unit 5: Reducing Lists with Fold
    • Summing a List with Fold
    • Finding the Largest with Fold
    • Counting Items with a Lambda Fold
  • Unit 6: Composing Functions into Pipelines
    • Gluing Functions into a Pipeline
    • Summing the Even Numbers Together

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