One Pager Cheat Sheet

• We will learn about the data structure objects and work with key-value pairs in JavaScript to store data easily and efficiently.
• Objects allow for the storage of key-value pairs to access data using keys (or properties) for indices, and can also store multiple values for a single key in an array.
• Objects cannot have duplicate keys, and JavaScript only allows strings to be keys in an object.
• No two keys in the same object can have the same name, even if the assigned values are the same, as JavaScript does not allow an object to have two same keys.
• Attempting to access the first element in a JavaScript object using an index (like an array or string) will return undefined since objects consist of only key-value pairs.
• Dictionaries have several built-in functions and properties for insertion, deletion, and other operations, as well as Object methods for obtaining length, keys, and values.
• The Object.entries() method returns an array of key-value pairs from an object, which can be accessed using an index starting at zero, e.g. pairs[1].
• We learned about different data storage elements, such as variables, lists, and objects , which are used to store and manipulate data depending on the situation.