![]() ![]() If we use the length property on the new array, then it will return the number 3. In this example, we are creating an array with a length of 3 empty slots. If a number parameter is passed into the parenthesis, that will set the length for the new array. const books = Ĭonsole.log(books) How to create an array in JavaScript using the new operator and Array constructorĪnother way to create an array is to use the new keyword with the Array constructor. ![]() If we console.log the array, then it will show us all 4 elements listed in the array. The most common way to create an array in JavaScript would be to assign that array to a variable like this: const books = How to create an array in JavaScript using the assignment operator I will also show you how to create an array from a string using the split() method. In this article, I will show you 3 ways you can create an array using JavaScript. And you're equipped with a handy mnemonic, that splice compared to slice has an additional letter, 'p', which helps you remember that splice mutates and optionally adds or removes from the original array.An array is a type of data structure where you can store an ordered list of elements. ![]() You now know that slice makes a shallow copy of the original array, while splice mutates the original array and optionally adds or removes elements. ConclusionĪnd there we have it! This blog goes over the differences between slice and splice. And because splice can add and remove stuff to the original array, that means that it also mutates the original array. Because of the extra letter, I associate the additional letter to splice's use of adding or removing from the original array. splice has an extra letter, 'p', compared to slice. I remember the difference between slice and splice using a mnemonic. insert 'juliet' and 'zeke' at 3rd index // returns Ĭonsole. splice ( 3, 1, 'juliet', 'zeke' ) // remove 'harper'. ![]()
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