Question

I want to map elements of an array such that all elements
of the array are floats, except the first element which
is a string.

Anyone know how I can do this?

Tried this but doesn’t work:

arr = arr.map { |e| e.to_i if e != arr.first }

Answer 1

Another solution is

[array.first] + array.drop(1).map &:to_f

This makes it clear that you want the first element separate from the rest, and you want the rest of the elements to be of type Float. Other options include

array.map { |element, index| index == 0 ? element : element.to_f }
array.map { |element| element == array.first ? element : element.to_f }