Research suggests there are seven JavaScript language elements developers lookup more than any other. While you might not be able to write a complete JavaScript program using only these features, you most certainly won't get far without them. Beginners need to learn them, but they're also great brain refreshers for JavaScript veterans. Let’s take a look at the JavaScript language features every developer needs.

Collections of values are an essential aspect of all programming languages. In JavaScript, we use arrays to store collections. JavaScript arrays are incredibly flexible, which is largely due to JavaScript’s dynamic typing system. You can declare an empty array or one that already holds values:

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