How can I use the map method in Ruby?

How can I use the map method in Ruby?

The map method in Ruby is used to transform elements in an array. It returns a new array with the results.

Can you give me an example of using map?

Sure! If you have an array like numbers = [1, 2, 3], you can use numbers.map { |n| n * 2 } to get [2, 4, 6].

What if I want to use a method instead of a block?

You can pass a method name to map. For example, if you have a method double(n), you can use numbers.map(&method(:double)).

Are there any performance considerations with using map?

Yes, using map creates a new array, which can be memory-intensive for large datasets. Consider using each if you don't need a new array.