Map function will loop over items and return a new array of mapped Items const animals = Ĭonst animalsCopy = animals.map(a => `$'s kid`) Their non-mutating nature allows us to create new Arrays in different ways. Let’s see that in the following example: const divs = document.querySelectorAll('div') Įvent though map and reduce are used to loop over the Arrays. Here you can use the om function as well to create the array from the Array-like objects. One of such list is NodeList which you receive as an output of document.quaerySelectorAll const divs = document.querySelectorAll('div') Ĭonst divsArray = (divs) And, at that time you might wanna convert it to Array to better operability and readability on the data structure. Some Lists look like Arrays but are not arrays. const Animals = new Array('🐼', '🦁', '🐷', '🦊') Ĭonst copyOfAnimals = om(Animals) The newly created array is completely new copyrights and is not gonna mutate any changes to the old array. const moreAnimals = Īom will allow you to create the Arrays from another array. Like in the following example, we will add the new item and spread the old array to create a complete new Array. Spread operator as we saw in the different ways to create objects works similarly and helps in creating the Arrays faster. The override is that if you pass only one argument and it is an integer, the Constructor function will create an empty array for you of that specified length. Interesting thing to notice about the Constructor function is its handy override. Like in the following example for Array.of, we create array of mixed values: const Animals = Array.of('🐼', null, '🦊', undefined) You can achieve same with new Array function of. Form Objects using Object.keys and Object.valuesĪt first, the basic way to create arrays is here as follows: const animals = Īnother way to create array is by using Array Constructor function.New Array of Length and Fill with some value.We will be taking a look into some of them to create Arrays. In JavaScript as well, there are many ways to create arrays. In most of the programming languages, A collection of a certain finite number of items is an Array.
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