This is, essentially, the same thing that is being done in the first example when performing the listOfIds.push(listOfPeople.id) function. person.id in the second example and listOfPeople.id in the third example) for the index so that it is able to assign that value to the same index in the new array (i.e. map() function requires that the function return a value (i.e. i in the first and third examples) as parameters to the function that we define. person in the second and third examples) and the current index (i.e. map() function is “looping” over each item in the array and assigning the item (i.e. Now, I am sure you will recognize the listOfPeople.id piece of the code here from the for() loop example. Here is likely what you wrote, assuming you were using an Imperative Programming approach: You need to create an array that contains only the id values from each Person within the original array. Each Person contains 3 properties: id, name, and emailAddress. You’re chugging along with your code and are provided with an array of objects, where each object represents a Person. Let’s get into some actual code, shall we? Pure functions make code significantly-easier to read and write automated tests against.Īlright, enough talk. I do not claim to fully-understand Monads or some of the other concepts from that paradigm, but one thing has become clear to me: My perceptions and “programming style” have morphed ever since a friend introduced me to functional programming around 6 years ago. In some cases, such as mine, you slowly begin to change your perception of such things.
In every programmer’s career, there is a point in time where we were taught that Imperative Programming (usually as a precursor to Object-Oriented Programming) was the definitive method of building usable software. Those were simple times back before trying to take programming concepts and data structures and turn them into usable, real-world software. Oh, how I long for the days when learning a for loop was a foreign concept to me. If there is enough demand, I can create a separate tutorial to explain those further. If you only have knowledge of for() loops in JavaScript, this article will require you to understand the Arrow Function Expression syntax (a.k.a. Before I get started, this is going to teach you how the.
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