What are immutable arrays in functional programming?

What are immutable arrays in functional programming?

Immutable arrays are data structures that cannot be modified after they are created. Instead of changing the original array, any operation that would modify it returns a new array.

Why are immutable arrays important?

They help prevent side effects, making code easier to understand and debug. They also enable safer concurrent programming.

Can you give me an example of using immutable arrays in JavaScript?

Sure! In JavaScript, you can use methods like map, filter, and reduce to work with arrays immutably. For example, const newArray = oldArray.map(x => x * 2); creates a new array without modifying oldArray.

What are the performance implications of using immutable arrays?

While immutable arrays can lead to increased memory usage due to the creation of new arrays, they can also improve performance in certain scenarios by enabling optimizations in functional programming.