What Is an Array?

An array is a way to store a collection of multiple items under a single variable name. This section introduces how to create, delete and access array elements.  Think about the following as you read the article:

  • How are array elements accessed?
  • What methods are used to access the elements of an array?
  • How would you convert a string into an array?


Finding the index of items in an array

If you don't know the index of an item, you can use the indexOf() method. The indexOf() method takes an item as an argument and will either return the item's index or -1 if the item is not in the array: 

const birds = ["Parrot", "Falcon", "Owl"];
console.log(birds.indexOf("Owl")); //  2
console.log(birds.indexOf("Rabbit")); // -1