![]() ![]() There’s not a definite syntax of the reduce () method. Everything is the same as the map () and filter () methods but what’s important to understand is how the reduce method works under the hood. Meet y'all in the next blog post goodbye for now □. The reduce () method reduces an array to a single value by performing the desired operation on the elements collectively. If there is a better way of doing it, please comment below. I hope that you have learned something new from this blog post. There you have it, you have successfully mapped an array inside an array of object. We pass this array to the constant called showComments.ĭisplaying the result in the console would be What you probably are trying is to inject a fatarrow function into foreach, that should look like this cards.forEach (card > / do something with card /). The line cards.forEach (card) is looking for a function named card. Its the same principle that you use for your own method chaining. filter method because map returns an array. Because you return a reference pointing to an Array, youll have access to all the properties of Array. The result of the expression above will be another array. In the above example, the array method map returns an Array, which has a formidable number of methods. Since the comment object is an array as well, we can run the map function on it too, like below. In this example, I pass the callback function the data parameter and we use that parameter to get to the comment object which contains the array we are looking for. ![]() On the other hand, forEach is a method that eases traversing a collection by not using usual for loop syntax for collections, and mutating (or changing) each item if desired. It returns a new array containing the resulting values of running the operation on each element with the parameter it accepts. With map, it is expected to create a new collection that is created by some mapping from initial collection. The map() method takes a callback method that performs an operation on the elements in the array. The first map runs on the outermost and the second map for the inner array. In other to make this work, you would need to use two map methods. I realized I was doing the wrong thing by using just one map method. I actually search through google trying to find a quick solution to it and I actually didn't see what I like which is what prompted me writing this article. I spent a good twenty minutes wondering how to return the contents of the comment array. Going through the data content, you can see it's an array of objects with an array nested inside it. I was given a folder to get started with, inside the folder was a data.json file and other assets I would need. ![]() Let is also used to declare variables(new way)Ĭonst is used to declare const values.Late into the year 2021, I was practicing my frontend skills with a task from frontend mentors. Var is used to declare variables(old way of declaring variables)
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