CSV::Table#by_col

table.by_col → table_dup

# File tmp/rubies/ruby-3.3.0/lib/csv/table.rb, line 242
def by_col
  self.class.new(@table.dup).by_col!
end

Returns a duplicate of self, in column mode (see Column Mode):

Example

source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
table = CSV.parse(source, headers: true)
table.mode # => :col_or_row
dup_table = table.by_col
dup_table.mode # => :col
dup_table.equal?(table) # => false # It's a dup

This may be used to chain method calls without changing the mode (but also will affect performance and memory usage):

Example

dup_table.by_col['Name']

Also note that changes to the duplicate table will not affect the original.

See also #by_col! #[]= #[] #by_col_or_row also in 3.2 · 3.1 · 3.0

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