CSV::Row#header?

header?(header)

# 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 #has_key? #header_row? #fields #headers also in 3.2 · 3.1 · 3.0