Download e-book for iPad: Beginning Functional JavaScript. Functional Programming with by Anto Aravinth

By Anto Aravinth

ISBN-10: 1484226569

ISBN-13: 9781484226568

Learn sensible programming innovations utilizing JavaScript ES6. you are going to research suggestions equivalent to currying, partial services, higher-order capabilities, and monads.

Programming languages have advanced from targeting methods to things and now on function. JavaScript supports practical programming and permits builders to write down well-crafted code.

What you are going to Learn:   

  • Master practical programming concepts
  • Identify how capabilities are taken care of in JavaScript
  • Understand real-world useful libraries and create a useful library that mimics underscore.js
  • Perform pure-error dealing with ideas corresponding to functors and monads
  • Discover ES6 sensible gains resembling unfold operators and generators

Who This booklet Is For:

JavaScript builders (or rookies) who are looking to comprehend useful programming recommendations and the practical nature of the language.

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

Example text

So how about passing a variable that has reference to a function? log("I'm a function") } tellType(dataFn) => function That’s great! Now we will make our tellType to execute the passed argument as shown in Listing 3-3 if it’s of type function: Listing 3-3. log("The passed data is " + arg) } 31 Chapter 3 ■ Higher-Order Functions Here we are checking whether the passed arg is of type function; if so, call it. Remember if a variable is of type function, it means it has a reference to a function that can be executed.

But let’s abstract these away into a function called every. The every function takes two arguments: an array and a function. It checks if all the elements of the array are evaluated to true by the passed function. The implementation looks like this as shown in Listing 3-8: Listing 3-8. length;i++) result = result && fn(arr[i]) return result } 37 Chapter 3 ■ Higher-Order Functions Here we are simply iterating over the passed array and calling the fn by passing the current content of the array element at the iteration.

This is mainly due to the point number 1. A closure function can access all the variables declared in its own declaration (see point 1). No rocket science here! 46 Chapter 4 ■ Closures and Higher-Order Functions ■■Note A strong take away from the above code snippet is that, inner function won't be visible outside outer function! Go ahead and test it. log(global) } inner() //call the inner function. } now when inner function executed, it does print the value global. Thus closures can access the global variable (see point 2).

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Beginning Functional JavaScript. Functional Programming with JavaScript using EcmaScript 6 by Anto Aravinth

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