fields = CSV.parse(File.open(filename).first)[0]
fields.each_with_index do |field, i|
fields[i] = field.downcase
end
我想从一线走到第一线,把它归为CSV,使每个要素降低。
这对我来说似乎太多余。 任何建议?
fields = CSV.parse(File.open(filename).first)[0]
fields.each_with_index do |field, i|
fields[i] = field.downcase
end
我想从一线走到第一线,把它归为CSV,使每个要素降低。
这对我来说似乎太多余。 任何建议?
如果希望:
fields.map!(&:downcase)
甚至:
fields = CSV.parse(File.open(filename).first)[0].map(&:downcase)
我认为,你再留下一个档案处理 there死问题,这样你可能想尝试像:
fields = []
File.open(filename) do |f|
fields = CSV.parse(f.readline)[0].map(&:downcase)
end
我不认为你有什么错误,但可以说:
fields = CSV.parse(File.open(filename, r ).first).first.map(&:downcase)
或者,你可以比较容易阅读某些方法:
def first_line_of(filename)
File.open(filename, r ).first
end
def csv_to_array(string)
CSV.parse(string).first
end
def downcase(a)
a.map(&:downcase)
end
fields = downcase csv_to_array first_line_of filename
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