What are some common mistakes when using map and reduce?

What are some common mistakes when using map and reduce?

Some common mistakes include not returning the correct value in the callback, using reduce incorrectly, and misunderstanding the data structure.

Can you explain how to use map correctly?

Sure! The map function creates a new array by applying a function to each element of the original array. Make sure to return the value you want to include in the new array.

What about reduce? How does it work?

The reduce function executes a reducer function on each element of the array, resulting in a single output value. It's important to provide an initial value to avoid errors.

What are some examples of mistakes in code?

Common mistakes include forgetting to return a value in the map callback, or using the wrong accumulator in reduce, which can lead to unexpected results.