Beginning Functional JavaScript. Functional Programming with by Anto Aravinth

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By Anto Aravinth

Learn useful programming techniques utilizing JavaScript ES6. you are going to research strategies akin to currying, partial features, higher-order features, and monads.

Programming languages have developed from concentrating on techniques to things and now on function. JavaScript supports sensible programming and permits builders to write down well-crafted code.

What you'll Learn:   

  • Master practical programming concepts
  • Identify how features are taken care of in JavaScript
  • Understand real-world practical libraries and create a useful library that mimics underscore.js
  • Perform pure-error dealing with innovations akin to functors and monads
  • Discover ES6 practical positive aspects akin to unfold operators and generators

Who This ebook Is For:

JavaScript builders (or newbies) who are looking to comprehend practical programming suggestions and the practical nature of the language.

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Additional resources for Beginning Functional JavaScript. Functional Programming with JavaScript using EcmaScript 6

Example text

Very similarly as we do for String and Numbers data types. Functions are First Class Citizens when the language permits them to be used as any other data type, that is, functions can be assigned to variables, passed around as arguments, and can be returned from other functions. In the next section we will see a quick example of what we mean by storing and passing functions around. Storing a Function As mentioned in the previous section, functions are nothing but data. Since it’s data, we can hold them in a variable!

Unary Function There is a default method in the array prototype called map. Don't worry; we are going to discover a whole lot of functional functions for array in the next chapter, where we will be seeing how to create our own map, too. For now, map is a function, which is very similar to the forEach function we have defined. The only difference is that map returns the result of the callback function. map((a) => { return a * a }) =>[1, 4, 9] The interesting point to note over here is that the map calls the function with three arguments, which are element, index, and arr.

The sortBy function works just because JavaScript supports closures. We need to clearly understand what closures are before we go ahead and write higher-order functions. Closures will be the topic of the next chapter. Remember though, we will be writing our real-world higher-order function after explaining closures in the next chapter! 42 Chapter 3 ■ Higher-Order Functions Summary We started with simple data types that JavaScript supports. We found that Function is also a data type in JavaScript.

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