mirror of
https://github.com/ruby/ruby.git
synced 2022-11-09 12:17:21 -05:00
[ruby/csv] More on Recipes headers (#183)
https://github.com/ruby/csv/commit/d7ae3df801
This commit is contained in:
Burdette Lamar
Sutou Kouhei
parent
15e457d6a3
commit
3cfb63fcd8
Notes:
git
2020-11-24 09:34:28 +09:00
1 changed files with 86 additions and 86 deletions
|
|
@ -6,62 +6,62 @@ All code snippets on this page assume that the following has been executed:
|
|||
=== Contents
|
||||
|
||||
- {Parsing: Source Formats}[#label-Parsing-3A+Source+Formats]
|
||||
- {Parse from String}[#label-Parse+from+String]
|
||||
- {Parse from String with Headers}[#label-Parse+from+String+with+Headers]
|
||||
- {Parse from String Without Headers}[#label-Parse+from+String+Without+Headers]
|
||||
- {Parse from File}[#label-Parse+from+File]
|
||||
- {Parse from File with Headers}[#label-Parse+from+File+with+Headers]
|
||||
- {Parse from File Without Headers}[#label-Parse+from+File+Without+Headers]
|
||||
- {Parse from IO Stream}[#label-Parse+from+IO+Stream]
|
||||
- {Parse from IO Stream with Headers}[#label-Parse+from+IO+Stream+with+Headers]
|
||||
- {Parse from IO Stream Without Headers}[#label-Parse+from+IO+Stream+Without+Headers]
|
||||
- {Parsing from a String}[#label-Parsing+from+a+String]
|
||||
- {Recipe: Parse from String with Headers}[#label-Recipe-3A+Parse+from+String+with+Headers]
|
||||
- {Recipe: Parse from String Without Headers}[#label-Recipe-3A+Parse+from+String+Without+Headers]
|
||||
- {Parsing from a File}[#label-Parsing+from+a+File]
|
||||
- {Recipe: Parse from File with Headers}[#label-Recipe-3A+Parse+from+File+with+Headers]
|
||||
- {Recipe: Parse from File Without Headers}[#label-Recipe-3A+Parse+from+File+Without+Headers]
|
||||
- {Parsing from an IO Stream}[#label-Parsing+from+an+IO+Stream]
|
||||
- {Recipe: Parse from IO Stream with Headers}[#label-Recipe-3A+Parse+from+IO+Stream+with+Headers]
|
||||
- {Recipe: Parse from IO Stream Without Headers}[#label-Recipe-3A+Parse+from+IO+Stream+Without+Headers]
|
||||
- {Parsing: Field Converters}[#label-Parsing-3A+Field+Converters]
|
||||
- {Convert Fields to Objects}[#label-Convert+Fields+to+Objects]
|
||||
- {Convert Fields to Integers}[#label-Convert+Fields+to+Integers]
|
||||
- {Convert Fields to Floats}[#label-Convert+Fields+to+Floats]
|
||||
- {Convert Fields to Numerics}[#label-Convert+Fields+to+Numerics]
|
||||
- {Convert Fields to Dates}[#label-Convert+Fields+to+Dates]
|
||||
- {Convert Fields to DateTimes}[#label-Convert+Fields+to+DateTimes]
|
||||
- {Convert Assorted Fields to Objects}[#label-Convert+Assorted+Fields+to+Objects]
|
||||
- {Convert Fields to Other Objects}[#label-Convert+Fields+to+Other+Objects]
|
||||
- {Filter Field Strings}[#label-Filter+Field+Strings]
|
||||
- {Register Field Converters}[#label-Register+Field+Converters]
|
||||
- {Use Multiple Field Converters}[#label-Use+Multiple+Field+Converters]
|
||||
- {Specify Multiple Field Converters in Option :converters}[#label-Specify+Multiple+Field+Converters+in+Option+-3Aconverters]
|
||||
- {Specify Multiple Field Converters in a Custom Converter List}[#label-Specify+Multiple+Field+Converters+in+a+Custom+Converter+List]
|
||||
- {Converting Fields to Objects}[#label-Converting+Fields+to+Objects]
|
||||
- {Recipe: Convert Fields to Integers}[#label-Recipe-3A+Convert+Fields+to+Integers]
|
||||
- {Recipe: Convert Fields to Floats}[#label-Recipe-3A+Convert+Fields+to+Floats]
|
||||
- {Recipe: Convert Fields to Numerics}[#label-Recipe-3A+Convert+Fields+to+Numerics]
|
||||
- {Recipe: Convert Fields to Dates}[#label-Recipe-3A+Convert+Fields+to+Dates]
|
||||
- {Recipe: Convert Fields to DateTimes}[#label-Recipe-3A+Convert+Fields+to+DateTimes]
|
||||
- {Recipe: Convert Assorted Fields to Objects}[#label-Recipe-3A+Convert+Assorted+Fields+to+Objects]
|
||||
- {Recipe: Convert Fields to Other Objects}[#label-Recipe-3A+Convert+Fields+to+Other+Objects]
|
||||
- {Recipe: Filter Field Strings}[#label-Recipe-3A+Filter+Field+Strings]
|
||||
- {Recipe: Register Field Converters}[#label-Recipe-3A+Register+Field+Converters]
|
||||
- {Using Multiple Field Converters}[#label-Using+Multiple+Field+Converters]
|
||||
- {Recipe: Specify Multiple Field Converters in Option :converters}[#label-Recipe-3A+Specify+Multiple+Field+Converters+in+Option+-3Aconverters]
|
||||
- {Recipe: Specify Multiple Field Converters in a Custom Converter List}[#label-Recipe-3A+Specify+Multiple+Field+Converters+in+a+Custom+Converter+List]
|
||||
- {Generating: Output Formats}[#label-Generating-3A+Output+Formats]
|
||||
- {Generate to String}[#label-Generate+to+String]
|
||||
- {Generate to String with Headers}[#label-Generate+to+String+with+Headers]
|
||||
- {Generate to String Without Headers}[#label-Generate+to+String+Without+Headers]
|
||||
- {Generate to File}[#label-Generate+to+File]
|
||||
- {Generate to File with Headers}[#label-Generate+to+File+with+Headers]
|
||||
- {Generate to File Without Headers}[#label-Generate+to+File+Without+Headers]
|
||||
- {Generate to IO Stream}[#label-Generate+to+IO+Stream]
|
||||
- {Generate to IO Stream with Headers}[#label-Generate+to+IO+Stream+with+Headers]
|
||||
- {Generate to IO Stream Without Headers}[#label-Generate+to+IO+Stream+Without+Headers]
|
||||
- {Generating to a String}[#label-Generating+to+a+String]
|
||||
- {Recipe: Generate to String with Headers}[#label-Recipe-3A+Generate+to+String+with+Headers]
|
||||
- {Recipe: Generate to String Without Headers}[#label-Recipe-3A+Generate+to+String+Without+Headers]
|
||||
- {Generating to a File}[#label-Generating+to+a+File]
|
||||
- {Recipe: Generate to File with Headers}[#label-Recipe-3A+Generate+to+File+with+Headers]
|
||||
- {Recipe: Generate to File Without Headers}[#label-Recipe-3A+Generate+to+File+Without+Headers]
|
||||
- {Generating to IO an Stream}[#label-Generating+to+an+IO+Stream]
|
||||
- {Recipe: Generate to IO Stream with Headers}[#label-Recipe-3A+Generate+to+IO+Stream+with+Headers]
|
||||
- {Recipe: Generate to IO Stream Without Headers}[#label-Recipe-3A+Generate+to+IO+Stream+Without+Headers]
|
||||
- {Filtering: Source and Output Formats}[#label-Filtering-3A+Source+and+Output+Formats]
|
||||
- {Filter String to String}[#label-Filter+String+to+String]
|
||||
- {Filter String to String with Headers}[#label-Filter+String+to+String+with+Headers]
|
||||
- {Filter String to String Without Headers}[#label-Filter+String+to+String+Without+Headers]
|
||||
- {Filter String to IO Stream}[#label-Filter+String+to+IO+Stream]
|
||||
- {Filter String to IO Stream with Headers}[#label-Filter+String+to+IO+Stream+with+Headers]
|
||||
- {Filter String to IO Stream Without Headers}[#label-Filter+String+to+IO+Stream+Without+Headers]
|
||||
- {Filter IO Stream to String}[#label-Filter+IO+Stream+to+String]
|
||||
- {Filter IO Stream to String with Headers}[#label-Filter+IO+Stream+to+String+with+Headers]
|
||||
- {Filter IO Stream to String Without Headers}[#label-Filter+IO+Stream+to+String+Without+Headers]
|
||||
- {Filter IO Stream to IO Stream}[#label-Filter+IO+Stream+to+IO+Stream]
|
||||
- {Filter IO Stream to IO Stream with Headers}[#label-Filter+IO+Stream+to+IO+Stream+with+Headers]
|
||||
- {Filter IO Stream to IO Stream Without Headers}[#label-Filter+IO+Stream+to+IO+Stream+Without+Headers]
|
||||
- {Filtering String to String}[#label-Filtering+String+to+String]
|
||||
- {Recipe: Filter String to String with Headers}[#label-Recipe-3A+Filter+String+to+String+with+Headers]
|
||||
- {Recipe: Filter String to String Without Headers}[#label-Recipe-3A+Filter+String+to+String+Without+Headers]
|
||||
- {Filtering String to IO Stream}[#label-Filtering+String+to+IO+Stream]
|
||||
- {Recipe: Filter String to IO Stream with Headers}[#label-Recipe-3A+Filter+String+to+IO+Stream+with+Headers]
|
||||
- {Recipe: Filter String to IO Stream Without Headers}[#label-Recipe-3A+Filter+String+to+IO+Stream+Without+Headers]
|
||||
- {Filtering IO Stream to String}[#label-Filtering+IO+Stream+to+String]
|
||||
- {Recipe: Filter IO Stream to String with Headers}[#label-Recipe-3A+Filter+IO+Stream+to+String+with+Headers]
|
||||
- {Recipe: Filter IO Stream to String Without Headers}[#label-Recipe-3A+Filter+IO+Stream+to+String+Without+Headers]
|
||||
- {Filtering IO Stream to IO Stream}[#label-Filtering+IO+Stream+to+IO+Stream]
|
||||
- {Recipe: Filter IO Stream to IO Stream with Headers}[#label-Recipe-3A+Filter+IO+Stream+to+IO+Stream+with+Headers]
|
||||
- {Recipe: Filter IO Stream to IO Stream Without Headers}[#label-Recipe-3A+Filter+IO+Stream+to+IO+Stream+Without+Headers]
|
||||
|
||||
=== Parsing: Source Formats
|
||||
|
||||
You can parse \CSV data from a \String, from a \File (via its path), or from an \IO stream.
|
||||
|
||||
==== Parse from \String
|
||||
==== Parsing from a \String
|
||||
|
||||
You can parse \CSV data from a \String, with or without headers.
|
||||
|
||||
===== Parse from \String with Headers
|
||||
===== Recipe: Parse from \String with Headers
|
||||
|
||||
Use class method CSV.parse with option +headers+ to read a source \String all at once
|
||||
(may have memory resource implications):
|
||||
|
|
@ -77,7 +77,7 @@ Ouput:
|
|||
#<CSV::Row "Name":"bar" "Value":"1">
|
||||
#<CSV::Row "Name":"baz" "Value":"2">
|
||||
|
||||
===== Parse from \String Without Headers
|
||||
===== Recipe: Parse from \String Without Headers
|
||||
|
||||
Use class method CSV.parse without option +headers+ to read a source \String all at once
|
||||
(may have memory resource implications):
|
||||
|
|
@ -93,11 +93,11 @@ Output:
|
|||
["bar", "1"]
|
||||
["baz", "2"]
|
||||
|
||||
==== Parse from \File
|
||||
==== Parsing from a \File
|
||||
|
||||
You can parse \CSV data from a \File, with or without headers.
|
||||
|
||||
===== Parse from \File with Headers
|
||||
===== Recipe: Parse from \File with Headers
|
||||
|
||||
Use instance method CSV#read with option +headers+ to read a file all at once:
|
||||
string = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
|
||||
|
|
@ -114,7 +114,7 @@ Output:
|
|||
#<CSV::Row "Name":"bar" "Value":"1">
|
||||
#<CSV::Row "Name":"baz" "Value":"2">
|
||||
|
||||
===== Parse from \File Without Headers
|
||||
===== Recipe: Parse from \File Without Headers
|
||||
|
||||
Use class method CSV.read without option +headers+ to read a file all at once:
|
||||
string = "foo,0\nbar,1\nbaz,2\n"
|
||||
|
|
@ -131,11 +131,11 @@ Output:
|
|||
["bar", "1"]
|
||||
["baz", "2"]
|
||||
|
||||
==== Parse from \IO Stream
|
||||
==== Parsing from an \IO Stream
|
||||
|
||||
You can parse \CSV data from an \IO stream, with or without headers.
|
||||
|
||||
===== Parse from \IO Stream with Headers
|
||||
===== Recipe: Parse from \IO Stream with Headers
|
||||
|
||||
Use class method CSV.parse with option +headers+ to read an \IO stream all at once:
|
||||
string = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
|
||||
|
|
@ -156,7 +156,7 @@ Output:
|
|||
#<CSV::Row "Name":"bar" "Value":"1">
|
||||
#<CSV::Row "Name":"baz" "Value":"2">
|
||||
|
||||
===== Parse from \IO Stream Without Headers
|
||||
===== Recipe: Parse from \IO Stream Without Headers
|
||||
|
||||
Use class method CSV.parse without option +headers+ to read an \IO stream all at once:
|
||||
string = "foo,0\nbar,1\nbaz,2\n"
|
||||
|
|
@ -182,7 +182,7 @@ Output:
|
|||
You can use field converters to change parsed \String fields into other objects,
|
||||
or to otherwise modify the \String fields.
|
||||
|
||||
==== Convert Fields to Objects
|
||||
==== Converting Fields to Objects
|
||||
|
||||
Use field converters to change parsed \String objects into other, more specific, objects.
|
||||
|
||||
|
|
@ -198,49 +198,49 @@ Other built-in field converters include:
|
|||
|
||||
You can also define field converters to convert to objects of other classes.
|
||||
|
||||
===== Convert Fields to Integers
|
||||
===== Recipe: Convert Fields to Integers
|
||||
|
||||
Convert fields to \Integer objects using built-in converter <tt>:integer</tt>:
|
||||
source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
|
||||
parsed = CSV.parse(source, headers: true, converters: :integer)
|
||||
parsed.map {|row| row['Value'].class} # => [Integer, Integer, Integer]
|
||||
|
||||
===== Convert Fields to Floats
|
||||
===== Recipe: Convert Fields to Floats
|
||||
|
||||
Convert fields to \Float objects using built-in converter <tt>:float</tt>:
|
||||
source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
|
||||
parsed = CSV.parse(source, headers: true, converters: :float)
|
||||
parsed.map {|row| row['Value'].class} # => [Float, Float, Float]
|
||||
|
||||
===== Convert Fields to Numerics
|
||||
===== Recipe: Convert Fields to Numerics
|
||||
|
||||
Convert fields to \Integer and \Float objects using built-in converter <tt>:numeric</tt>:
|
||||
source = "Name,Value\nfoo,0\nbar,1.1\nbaz,2.2\n"
|
||||
parsed = CSV.parse(source, headers: true, converters: :numeric)
|
||||
parsed.map {|row| row['Value'].class} # => [Integer, Float, Float]
|
||||
|
||||
===== Convert Fields to Dates
|
||||
===== Recipe: Convert Fields to Dates
|
||||
|
||||
Convert fields to \Date objects using built-in converter <tt>:date</tt>:
|
||||
source = "Name,Date\nfoo,2001-02-03\nbar,2001-02-04\nbaz,2001-02-03\n"
|
||||
parsed = CSV.parse(source, headers: true, converters: :date)
|
||||
parsed.map {|row| row['Date'].class} # => [Date, Date, Date]
|
||||
|
||||
===== Convert Fields to DateTimes
|
||||
===== Recipe: Convert Fields to DateTimes
|
||||
|
||||
Convert fields to \DateTime objects using built-in converter <tt>:date_time</tt>:
|
||||
source = "Name,DateTime\nfoo,2001-02-03\nbar,2001-02-04\nbaz,2020-05-07T14:59:00-05:00\n"
|
||||
parsed = CSV.parse(source, headers: true, converters: :date_time)
|
||||
parsed.map {|row| row['DateTime'].class} # => [DateTime, DateTime, DateTime]
|
||||
|
||||
===== Convert Assorted Fields to Objects
|
||||
===== Recipe: Convert Assorted Fields to Objects
|
||||
|
||||
Convert assorted fields to objects using built-in converter <tt>:all</tt>:
|
||||
source = "Type,Value\nInteger,0\nFloat,1.0\nDateTime,2001-02-04\n"
|
||||
parsed = CSV.parse(source, headers: true, converters: :all)
|
||||
parsed.map {|row| row['Value'].class} # => [Integer, Float, DateTime]
|
||||
|
||||
===== Convert Fields to Other Objects
|
||||
===== Recipe: Convert Fields to Other Objects
|
||||
|
||||
Define a custom field converter to convert \String fields into other objects.
|
||||
This example defines and uses a custom field converter
|
||||
|
|
@ -252,7 +252,7 @@ that converts each column-1 value to a \Rational object:
|
|||
parsed = CSV.parse(source, headers: true, converters: rational_converter)
|
||||
parsed.map {|row| row['Value'].class} # => [Rational, Rational, Rational]
|
||||
|
||||
==== Filter Field Strings
|
||||
==== Recipe: Filter Field Strings
|
||||
|
||||
Define a custom field converter to modify \String fields.
|
||||
This example defines and uses a custom field converter
|
||||
|
|
@ -263,7 +263,7 @@ that strips whitespace from each field value:
|
|||
parsed['Name'] # => ["foo", "bar", "baz"]
|
||||
parsed['Value'] # => ["0", "1", "2"]
|
||||
|
||||
==== Register Field Converters
|
||||
==== Recipe: Register Field Converters
|
||||
|
||||
Register a custom field converter, assigning it a name;
|
||||
then refer to the converter by its name:
|
||||
|
|
@ -272,20 +272,20 @@ then refer to the converter by its name:
|
|||
parsed = CSV.parse(source, headers: true, converters: :rational)
|
||||
parsed['Value'] # => [(0/1), (1/1), (2/1)]
|
||||
|
||||
==== Use Multiple Field Converters
|
||||
==== Using Multiple Field Converters
|
||||
|
||||
You can use multiple field converters in either of these ways:
|
||||
- Specify converters in option <tt>:converters</tt>.
|
||||
- Specify converters in a custom converter list.
|
||||
|
||||
===== Specify Multiple Field Converters in Option <tt>:converters</tt>
|
||||
===== Recipe: Specify Multiple Field Converters in Option <tt>:converters</tt>
|
||||
|
||||
Apply multiple field converters by specifying them in option <tt>:conveters</tt>:
|
||||
source = "Name,Value\nfoo,0\nbar,1.0\nbaz,2.0\n"
|
||||
parsed = CSV.parse(source, headers: true, converters: [:integer, :float])
|
||||
parsed['Value'] # => [0, 1.0, 2.0]
|
||||
|
||||
===== Specify Multiple Field Converters in a Custom Converter List
|
||||
===== Recipe: Specify Multiple Field Converters in a Custom Converter List
|
||||
|
||||
Apply multiple field converters by defining and registering a custom converter list:
|
||||
strip_converter = proc {|field| field.strip }
|
||||
|
|
@ -300,11 +300,11 @@ Apply multiple field converters by defining and registering a custom converter l
|
|||
|
||||
You can generate \CSV output to a \String, to a \File (via its path), or to an \IO stream.
|
||||
|
||||
==== Generate to \String
|
||||
==== Generating to a \String
|
||||
|
||||
You can generate \CSV output to a \String, with or without headers.
|
||||
|
||||
===== Generate to \String with Headers
|
||||
===== Recipe: Generate to \String with Headers
|
||||
|
||||
Use class method CSV.generate with option +headers+ to generate to a \String.
|
||||
|
||||
|
|
@ -317,7 +317,7 @@ that are to be generated:
|
|||
end
|
||||
output_string # => "Name,Value\nFoo,0\nBar,1\nBaz,2\n"
|
||||
|
||||
===== Generate to \String Without Headers
|
||||
===== Recipe: Generate to \String Without Headers
|
||||
|
||||
Use class method CSV.generate without option +headers+ to generate to a \String.
|
||||
|
||||
|
|
@ -330,11 +330,11 @@ that are to be generated:
|
|||
end
|
||||
output_string # => "Foo,0\nBar,1\nBaz,2\n"
|
||||
|
||||
==== Generate to \File
|
||||
==== Generating to a \File
|
||||
|
||||
You can generate /CSV data to a \File, with or without headers.
|
||||
|
||||
===== Generate to \File with Headers
|
||||
===== Recipe: Generate to \File with Headers
|
||||
|
||||
Use class method CSV.open with option +headers+ generate to a \File.
|
||||
|
||||
|
|
@ -348,7 +348,7 @@ that are to be generated:
|
|||
end
|
||||
p File.read(path) # => "Name,Value\nFoo,0\nBar,1\nBaz,2\n"
|
||||
|
||||
===== Generate to \File Without Headers
|
||||
===== Recipe: Generate to \File Without Headers
|
||||
|
||||
Use class method CSV.open without option +headers+ to generate to a \File.
|
||||
|
||||
|
|
@ -362,11 +362,11 @@ that are to be generated:
|
|||
end
|
||||
p File.read(path) # => "Foo,0\nBar,1\nBaz,2\n"
|
||||
|
||||
==== Generate to \IO Stream
|
||||
==== Generating to an \IO Stream
|
||||
|
||||
You can generate \CSV data to an \IO stream, with or without headers.
|
||||
|
||||
==== Generate to \IO Stream with Headers
|
||||
==== Recipe: Generate to \IO Stream with Headers
|
||||
|
||||
Use class method CSV.new with option +headers+ to generate \CSV data to an \IO stream:
|
||||
path = 't.csv'
|
||||
|
|
@ -378,7 +378,7 @@ Use class method CSV.new with option +headers+ to generate \CSV data to an \IO s
|
|||
end
|
||||
p File.read(path) # => "Name,Value\nFoo,0\nBar,1\nBaz,2\n"
|
||||
|
||||
===== Generate to \IO Stream Without Headers
|
||||
===== Recipe: Generate to \IO Stream Without Headers
|
||||
|
||||
Use class method CSV.new without option +headers+ to generate \CSV data to an \IO stream:
|
||||
path = 't.csv'
|
||||
|
|
@ -396,11 +396,11 @@ You can use a Unix-style "filter" for \CSV data.
|
|||
The filter reads source \CSV data and writes output \CSV data as modified by the filter.
|
||||
The input and output \CSV data may be any mixture of \Strings and \IO streams.
|
||||
|
||||
==== Filter \String to \String
|
||||
==== Filtering \String to \String
|
||||
|
||||
You can filter one \String to another, with or without headers.
|
||||
|
||||
===== Filter \String to \String with Headers
|
||||
===== Recipe: Filter \String to \String with Headers
|
||||
|
||||
Use class method CSV.filter with option +headers+ to filter a \String to another \String:
|
||||
in_string = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
|
||||
|
|
@ -411,7 +411,7 @@ Use class method CSV.filter with option +headers+ to filter a \String to another
|
|||
end
|
||||
out_string # => "Name,Value\nFOO,0000\nBAR,1111\nBAZ,2222\n"
|
||||
|
||||
===== Filter \String to \String Without Headers
|
||||
===== Recipe: Filter \String to \String Without Headers
|
||||
|
||||
Use class method CSV.filter without option +headers+ to filter a \String to another \String:
|
||||
in_string = "foo,0\nbar,1\nbaz,2\n"
|
||||
|
|
@ -422,11 +422,11 @@ Use class method CSV.filter without option +headers+ to filter a \String to anot
|
|||
end
|
||||
out_string # => "FOO,0000\nBAR,1111\nBAZ,2222\n"
|
||||
|
||||
==== Filter \String to \IO Stream
|
||||
==== Filtering \String to \IO Stream
|
||||
|
||||
You can filter a \String to an \IO stream, with or without headers.
|
||||
|
||||
===== Filter \String to \IO Stream with Headers
|
||||
===== Recipe: Filter \String to \IO Stream with Headers
|
||||
|
||||
Use class method CSV.filter with option +headers+ to filter a \String to an \IO stream:
|
||||
in_string = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
|
||||
|
|
@ -439,7 +439,7 @@ Use class method CSV.filter with option +headers+ to filter a \String to an \IO
|
|||
end
|
||||
p File.read(path) # => "Name,Value\nFOO,0000\nBAR,1111\nBAZ,2222\n"
|
||||
|
||||
===== Filter \String to \IO Stream Without Headers
|
||||
===== Recipe: Filter \String to \IO Stream Without Headers
|
||||
|
||||
Use class method CSV.filter without option +headers+ to filter a \String to an \IO stream:
|
||||
in_string = "foo,0\nbar,1\nbaz,2\n"
|
||||
|
|
@ -452,11 +452,11 @@ Use class method CSV.filter without option +headers+ to filter a \String to an \
|
|||
end
|
||||
p File.read(path) # => "FOO,0000\nBAR,1111\nBAZ,2222\n"
|
||||
|
||||
==== Filter \IO Stream to \String
|
||||
==== Filtering \IO Stream to \String
|
||||
|
||||
You can filter an \IO stream to a \String, with or without headers.
|
||||
|
||||
===== Filter \IO Stream to \String with Headers
|
||||
===== Recipe: Filter \IO Stream to \String with Headers
|
||||
|
||||
Use class method CSV.filter with option +headers+ to filter an \IO stream to a \String:
|
||||
in_string = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
|
||||
|
|
@ -471,7 +471,7 @@ Use class method CSV.filter with option +headers+ to filter an \IO stream to a \
|
|||
end
|
||||
out_string # => "Name,Value\nFOO,0000\nBAR,1111\nBAZ,2222\n"
|
||||
|
||||
===== Filter \IO Stream to \String Without Headers
|
||||
===== Recipe: Filter \IO Stream to \String Without Headers
|
||||
|
||||
Use class method CSV.filter without option +headers+ to filter an \IO stream to a \String:
|
||||
in_string = "foo,0\nbar,1\nbaz,2\n"
|
||||
|
|
@ -486,11 +486,11 @@ Use class method CSV.filter without option +headers+ to filter an \IO stream to
|
|||
end
|
||||
out_string # => "FOO,0000\nBAR,1111\nBAZ,2222\n"
|
||||
|
||||
==== Filter \IO Stream to \IO Stream
|
||||
==== Filtering \IO Stream to \IO Stream
|
||||
|
||||
You can filter an \IO stream to another \IO stream, with or without headers.
|
||||
|
||||
===== Filter \IO Stream to \IO Stream with Headers
|
||||
===== Recipe: Filter \IO Stream to \IO Stream with Headers
|
||||
|
||||
Use class method CSV.filter with option +headers+ to filter an \IO stream to another \IO stream:
|
||||
in_path = 't.csv'
|
||||
|
|
@ -507,7 +507,7 @@ Use class method CSV.filter with option +headers+ to filter an \IO stream to ano
|
|||
end
|
||||
p File.read(out_path) # => "Name,Value\nFOO,0000\nBAR,1111\nBAZ,2222\n"
|
||||
|
||||
===== Filter \IO Stream to \IO Stream Without Headers
|
||||
===== Recipe: Filter \IO Stream to \IO Stream Without Headers
|
||||
|
||||
Use class method CSV.filter without option +headers+ to filter an \IO stream to another \IO stream:
|
||||
in_path = 't.csv'
|
||||
|
|
|
|||
Loading…
Reference in a new issue