CSV::Row#has_key?

row.has_key?(header) → true or false

# File tmp/rubies/ruby-3.3.0/lib/csv/row.rb, line 279
def has_key?(header)
  !!@row.assoc(header)
end

Returns true if there is a field with the given header, false otherwise.

See also #fields #header? #field_row? #header_row? also in 3.2 · 3.1 · 3.0