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Mastering JavaScript Functional Programming

You're reading from   Mastering JavaScript Functional Programming In-depth guide for writing robust and maintainable JavaScript code in ES8 and beyond

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Product type Paperback
Published in Nov 2017
Publisher Packt
ISBN-13 9781787287440
Length 386 pages
Edition 1st Edition
Languages
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Author (1):
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Federico Kereki Federico Kereki
Author Profile Icon Federico Kereki
Federico Kereki
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Toc

Table of Contents (15) Chapters Close

Preface 1. Becoming Functional - Several Questions FREE CHAPTER 2. Thinking Functionally - A First Example 3. Starting Out with Functions - A Core Concept 4. Behaving Properly - Pure Functions 5. Programming Declaratively - A Better Style 6. Producing Functions - Higher-Order Functions 7. Transforming Functions - Currying and Partial Application 8. Connecting Functions - Pipelining and Composition 9. Designing Functions - Recursion 10. Ensuring Purity - Immutability 11. Implementing Design Patterns - The Functional Way 12. Building Better Containers - Functional Data Types 13. Bibliography
14. Answers to Questions

Questions


8.1. Headline capitalization. Let's define headline-style capitalization to require that a sentence is all written in lowercase, except the first letter of each word. (The real definition of this style is more complicated, so let's simplify it for this question.) Write a function headline(sentence) that will receive a string as an argument and return an appropriately capitalized version. Spaces separate words. Build this function by composing smaller functions:

     console.log(headline("Alice's ADVENTURES in WoNdErLaNd")); 
     // Alice's Adventures In Wonderland

8.2. Pending tasks. A web service returns a result such as follows, showing, person by person, all their assigned tasks. Tasks may be finished (done===true) or pending (done===false). Your goal is to produce an array with the IDs of the pending tasks for a given person, identified by name, which should match the responsible field. Solve this by using composition or pipelining:

     const allTasks = {
         date: "2017...
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