What is the difference between map and reduce in JavaScript?

What is the difference between map and reduce in JavaScript?

The map method creates a new array by applying a function to each element of the original array, while reduce executes a reducer function on each element, resulting in a single output value.

Can you give me an example of how to use both methods?

Sure! For map, you can do something like const doubled = arr.map(num => num * 2); and for reduce, const sum = arr.reduce((acc, num) => acc + num, 0);.

When should I use map instead of reduce?

Use map when you want to transform each element of an array into a new array. Use reduce when you want to combine all elements into a single value.

Are there any performance differences between them?

Generally, map and reduce have similar performance, but reduce can be more complex and may require more processing if you're combining elements.