Ruby CSV.header_row?用法及代碼示例

header_row? → true or false

如果要讀取的下一行是標題行，則返回true； false 否則。

沒有標題：

string = "foo,0\nbar,1\nbaz,2\n"
csv = CSV.new(string)
csv.header_row? # => false

帶標題：

string = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
csv = CSV.new(string, headers: true)
csv.header_row? # => true
csv.shift # => #<CSV::Row "Name":"foo" "Value":"0">
csv.header_row? # => false

如果源未打開以供閱讀，則引發異常：

string = "foo,0\nbar,1\nbaz,2\n"
csv = CSV.new(string)
csv.close
# Raises IOError (not opened for reading)
csv.header_row?