Arrays Arrays are the main tool in JavaScript. They use contiguous memory. This allows you to access any element by its index instantly. - push: Adds an element to the end. - unshift: Adds an element ...

𝗢𝗯𝗷𝗲𝗰𝘁𝘀 𝗶𝗻 𝗝𝗮𝘃𝗮𝗦𝗰𝗿𝗶𝗽𝘁 JavaScript objects store data in key-value pairs. Each pair is a property. The key is a string. The value is any data type like a number, string, or function.

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