Question

I am trying to remove white space of array elements, but at the same time I want this to be inline replacement. Is something like this can be done..

lines[3..lines.length-4].map!(&:strip).delete_if { |table_name| table_name == "" }

Answer 1

It does not work because lines[3..lines.length-4] returns a new array, not a partial “reference” to the old one (so your map! is then just modifying in-place this new array).

An idea:

(3..lines.length-4).each { |idx| lines[idx].strip! }