Difference Between JavaScript Arrays and Objects

Difference Between JavaScript Arrays and Objects

Last Updated : 12 Nov, 2024

Below are the main differences between a JavaScript Array and Object.

Feature	JavaScript Arrays	JavaScript Objects
Index Type	Numeric indexes (0, 1, 2, ...)	Named keys (strings or symbols)
Order	Ordered collection	Unordered collection
Use Case	Storing lists, sequences, ordered data	Storing data with key-value pairs, attributes
Accessing Elements	Accessed by index (e.g., arr[0])	Accessed by key (e.g., obj["key"])
Iteration	Typically iterated using loops like for or forEach	Iterated using for...in, Object.keys(), or Object.entries()
Size Flexibility	Dynamic, can grow or shrink in size	Dynamic, can add or remove key-value pairs

When to use JavaScript Arrays and Objects?

Use arrays when you need numeric indexing and order matters.
Use objects when you need named keys and the relationship between keys and values is important.

Difference Between JavaScript Arrays and Objects

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