What are the performance differences between map, filter, and forEach in JavaScript?

What are the performance differences between map, filter, and forEach in JavaScript?

The performance differences can vary based on the context, but generally, 'map' and 'filter' create new arrays, while 'forEach' does not. 'Map' is typically faster for transforming data, while 'filter' is optimized for selecting elements.

Can you provide some benchmarks or examples?

Sure! For example, if you have an array of 1,000,000 items, using 'map' to double each value might take around 10ms, while 'filter' to select even numbers could take about 12ms. 'forEach' would take similar time but doesn't return a new array.

Which one should I use in my project?

It depends on your use case. If you need to transform data, use 'map'. If you need to filter data, use 'filter'. If you just want to iterate without creating a new array, 'forEach' is suitable.

Are there any situations where one is significantly better than the others?

Yes, if you're working with large datasets and performance is critical, 'map' and 'filter' can be more efficient than 'forEach' due to their optimized implementations.