Check if all values of array match condition

Question

I know that an empty string would be consider truthy, since only nil and false are considered falsey. But I have an array of empty strings like this:

["", "", ""].any?
 => true 

And I want it to return false if all the strings in the array are empty. One option is to do this:

["", "", ""].select {|item| item.present? }.any?
 => false 

But now I am using two iterators in this example. Is this the only way? Or is there another iterator in the arsenal of tools that suites the job?

Answer 1

any should take a block, so you should be able to do something like:

["", "", ""].any? {|item| item.present?}

---

This can be shortened using a to_proc method on the present? symbol (credit: @mu is too short, 2018):

['','',''].any?(&:present?)

Answer 2

In my head the logic would be like, "they're not all empty" so I would put

arr = ["","",""]

!arr.all?(&:empty?)

=> false

Using .present? on a string doesn't work in my testing environment.

Answer 3

You could write

arr.join != ''