F# How to Write/Read to a CSV File
I am working on an assignment using F# where I have to add in a specific student and his information to a large Students.txt file
The Student.txt file contains their lastname, firstname, middle intial, phone number, email, and their gpa
A snippet of the Students.txt file
If I am trying to add in this information and then read from the file:
type Phone =
type Email =
type StudentInfo =
{ firstName : string;
middleInitial : char option;
lastName : string;
phone : Phone;
email : Email option;
gpa : float }
let addPhone input =
let addEmail input =
let readStudentsFromCSV filename =
let students = readStudentsFromCSV "Students.txt"
I need insight on how to write these functions.
Note: This is only a snippet of my code.
csv f#
asked Nov 12 '18 at 0:01
policy_wizard
153
add a comment |
I am working on an assignment using F# where I have to add in a specific student and his information to a large Students.txt file
The Student.txt file contains their lastname, firstname, middle intial, phone number, email, and their gpa
A snippet of the Students.txt file
If I am trying to add in this information and then read from the file:
type Phone =
type Email =
type StudentInfo =
{ firstName : string;
middleInitial : char option;
lastName : string;
phone : Phone;
email : Email option;
gpa : float }
let addPhone input =
let addEmail input =
let readStudentsFromCSV filename =
let students = readStudentsFromCSV "Students.txt"
I need insight on how to write these functions.
Note: This is only a snippet of my code.
csv f#
asked Nov 12 '18 at 0:01
policy_wizard
153
Given that this a homework... Take a look at the Type Providers! They are gorgeous, just what you need. Here's the CSV Type Provider.
– psfinaki
Nov 12 '18 at 1:01
add a comment |
I am working on an assignment using F# where I have to add in a specific student and his information to a large Students.txt file
The Student.txt file contains their lastname, firstname, middle intial, phone number, email, and their gpa
A snippet of the Students.txt file
If I am trying to add in this information and then read from the file:
type Phone =
type Email =
type StudentInfo =
{ firstName : string;
middleInitial : char option;
lastName : string;
phone : Phone;
email : Email option;
gpa : float }
let addPhone input =
let addEmail input =
let readStudentsFromCSV filename =
let students = readStudentsFromCSV "Students.txt"
I need insight on how to write these functions.
Note: This is only a snippet of my code.
csv f#
asked Nov 12 '18 at 0:01
policy_wizard
153
I am working on an assignment using F# where I have to add in a specific student and his information to a large Students.txt file
The Student.txt file contains their lastname, firstname, middle intial, phone number, email, and their gpa
A snippet of the Students.txt file
If I am trying to add in this information and then read from the file:
type Phone =
type Email =
type StudentInfo =
{ firstName : string;
middleInitial : char option;
lastName : string;
phone : Phone;
email : Email option;
gpa : float }
let addPhone input =
let addEmail input =
let readStudentsFromCSV filename =
let students = readStudentsFromCSV "Students.txt"
I need insight on how to write these functions.
Note: This is only a snippet of my code.
csv f#
csv f#
asked Nov 12 '18 at 0:01
policy_wizard
153
asked Nov 12 '18 at 0:01
policy_wizard
153
edited Nov 12 '18 at 1:00
asked Nov 12 '18 at 0:01
policy_wizard
153
asked Nov 12 '18 at 0:01
policy_wizard
153
asked Nov 12 '18 at 0:01
policy_wizard
153
153
Given that this a homework... Take a look at the Type Providers! They are gorgeous, just what you need. Here's the CSV Type Provider.
– psfinaki
Nov 12 '18 at 1:01
add a comment |
Given that this a homework... Take a look at the Type Providers! They are gorgeous, just what you need. Here's the CSV Type Provider.
– psfinaki
Nov 12 '18 at 1:01
Given that this a homework... Take a look at the Type Providers! They are gorgeous, just what you need. Here's the CSV Type Provider.
– psfinaki
Nov 12 '18 at 1:01
Given that this a homework... Take a look at the Type Providers! They are gorgeous, just what you need. Here's the CSV Type Provider.
– psfinaki
Nov 12 '18 at 1:01
add a comment |
1 Answer
1
active
oldest
votes
There are a number of options. The main question is whether you want to write your own CSV parsing, or whether you want to use an existing library.
If this is an assignment, it might require you to write your own parser (doing that would probably be a bad idea in the real world, because real world CSV files can be very messy, but it might be fine if your input is very regular). If you were to use a library, the F# Data library is what most people in the F# community would use.
F# Data comes with a type provider called
CsvProviderwhich infers the type of rows in a CSV file for you, so you do not have to write explicit type definitions. (Or you can still do that, but then load data into your structures using a simple transformation.)F# Data also has
CsvFiletype, which just does the parsing, but then returns data as a sequence of rows (which are themselves arrays of string values). This might be nice if you just need something to take care of splitting the lines, but want to do the rest of the work.If you wanted to write CSV parsing on your own, you can use
File.ReadAllLinesto read individual rows and thenrow.Split(',')to turn each row into an array of strings using,as the separator. This could work on your file - but it will break if there is any escaping in your file (for exampleFoo, "a, b", Baris just three columns!
answered Nov 12 '18 at 11:39
Tomas Petricek
198k13288461
add a comment |
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1 Answer
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active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
There are a number of options. The main question is whether you want to write your own CSV parsing, or whether you want to use an existing library.
If this is an assignment, it might require you to write your own parser (doing that would probably be a bad idea in the real world, because real world CSV files can be very messy, but it might be fine if your input is very regular). If you were to use a library, the F# Data library is what most people in the F# community would use.
F# Data comes with a type provider called
CsvProviderwhich infers the type of rows in a CSV file for you, so you do not have to write explicit type definitions. (Or you can still do that, but then load data into your structures using a simple transformation.)F# Data also has
CsvFiletype, which just does the parsing, but then returns data as a sequence of rows (which are themselves arrays of string values). This might be nice if you just need something to take care of splitting the lines, but want to do the rest of the work.If you wanted to write CSV parsing on your own, you can use
File.ReadAllLinesto read individual rows and thenrow.Split(',')to turn each row into an array of strings using,as the separator. This could work on your file - but it will break if there is any escaping in your file (for exampleFoo, "a, b", Baris just three columns!
answered Nov 12 '18 at 11:39
Tomas Petricek
198k13288461
add a comment |
There are a number of options. The main question is whether you want to write your own CSV parsing, or whether you want to use an existing library.
If this is an assignment, it might require you to write your own parser (doing that would probably be a bad idea in the real world, because real world CSV files can be very messy, but it might be fine if your input is very regular). If you were to use a library, the F# Data library is what most people in the F# community would use.
F# Data comes with a type provider called
CsvProviderwhich infers the type of rows in a CSV file for you, so you do not have to write explicit type definitions. (Or you can still do that, but then load data into your structures using a simple transformation.)F# Data also has
CsvFiletype, which just does the parsing, but then returns data as a sequence of rows (which are themselves arrays of string values). This might be nice if you just need something to take care of splitting the lines, but want to do the rest of the work.If you wanted to write CSV parsing on your own, you can use
File.ReadAllLinesto read individual rows and thenrow.Split(',')to turn each row into an array of strings using,as the separator. This could work on your file - but it will break if there is any escaping in your file (for exampleFoo, "a, b", Baris just three columns!
answered Nov 12 '18 at 11:39
Tomas Petricek
198k13288461
add a comment |
There are a number of options. The main question is whether you want to write your own CSV parsing, or whether you want to use an existing library.
If this is an assignment, it might require you to write your own parser (doing that would probably be a bad idea in the real world, because real world CSV files can be very messy, but it might be fine if your input is very regular). If you were to use a library, the F# Data library is what most people in the F# community would use.
F# Data comes with a type provider called
CsvProviderwhich infers the type of rows in a CSV file for you, so you do not have to write explicit type definitions. (Or you can still do that, but then load data into your structures using a simple transformation.)F# Data also has
CsvFiletype, which just does the parsing, but then returns data as a sequence of rows (which are themselves arrays of string values). This might be nice if you just need something to take care of splitting the lines, but want to do the rest of the work.If you wanted to write CSV parsing on your own, you can use
File.ReadAllLinesto read individual rows and thenrow.Split(',')to turn each row into an array of strings using,as the separator. This could work on your file - but it will break if there is any escaping in your file (for exampleFoo, "a, b", Baris just three columns!
answered Nov 12 '18 at 11:39
Tomas Petricek
198k13288461
There are a number of options. The main question is whether you want to write your own CSV parsing, or whether you want to use an existing library.
If this is an assignment, it might require you to write your own parser (doing that would probably be a bad idea in the real world, because real world CSV files can be very messy, but it might be fine if your input is very regular). If you were to use a library, the F# Data library is what most people in the F# community would use.
F# Data comes with a type provider called
CsvProviderwhich infers the type of rows in a CSV file for you, so you do not have to write explicit type definitions. (Or you can still do that, but then load data into your structures using a simple transformation.)F# Data also has
CsvFiletype, which just does the parsing, but then returns data as a sequence of rows (which are themselves arrays of string values). This might be nice if you just need something to take care of splitting the lines, but want to do the rest of the work.If you wanted to write CSV parsing on your own, you can use
File.ReadAllLinesto read individual rows and thenrow.Split(',')to turn each row into an array of strings using,as the separator. This could work on your file - but it will break if there is any escaping in your file (for exampleFoo, "a, b", Baris just three columns!
answered Nov 12 '18 at 11:39
Tomas Petricek
198k13288461
answered Nov 12 '18 at 11:39
Tomas Petricek
198k13288461
answered Nov 12 '18 at 11:39
Tomas Petricek
198k13288461
answered Nov 12 '18 at 11:39
Tomas Petricek
198k13288461
198k13288461
add a comment |
add a comment |
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Given that this a homework... Take a look at the Type Providers! They are gorgeous, just what you need. Here's the CSV Type Provider.
– psfinaki
Nov 12 '18 at 1:01