How to pass &:read as argument to File.open as indicated by Rubocop

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I have this code

File.open(file_name, 'r') { |file| file.read }

but Rubocop is warning:

Offenses:

Style/SymbolProc: Pass &:read as argument to open instead of a
block.

How do you do this?

edited Jan 3 at 12:36

Stefan

77.5k895148

asked Jan 3 at 3:24

Obromios

4,63233368

2

You would like to read stackoverflow.com/a/9429972/10522579

– ray
Jan 3 at 7:07

1

You could just do File.read(file_name).

– Kimmo Lehto
Jan 3 at 9:27

add a comment |

I have this code

File.open(file_name, 'r') { |file| file.read }

but Rubocop is warning:

Offenses:

Style/SymbolProc: Pass &:read as argument to open instead of a
block.

How do you do this?

edited Jan 3 at 12:36

Stefan

77.5k895148

asked Jan 3 at 3:24

Obromios

4,63233368

2

You would like to read stackoverflow.com/a/9429972/10522579

– ray
Jan 3 at 7:07

1

You could just do File.read(file_name).

– Kimmo Lehto
Jan 3 at 9:27

add a comment |

I have this code

File.open(file_name, 'r') { |file| file.read }

but Rubocop is warning:

Offenses:

Style/SymbolProc: Pass &:read as argument to open instead of a
block.

How do you do this?

edited Jan 3 at 12:36

Stefan

77.5k895148

asked Jan 3 at 3:24

Obromios

4,63233368

I have this code

File.open(file_name, 'r') { |file| file.read }

but Rubocop is warning:

Offenses:

Style/SymbolProc: Pass &:read as argument to open instead of a
block.

How do you do this?

ruby rubocop

edited Jan 3 at 12:36

Stefan

77.5k895148

asked Jan 3 at 3:24

Obromios

4,63233368

edited Jan 3 at 12:36

Stefan

77.5k895148

asked Jan 3 at 3:24

Obromios

4,63233368

edited Jan 3 at 12:36

Stefan

77.5k895148

edited Jan 3 at 12:36

Stefan

77.5k895148

edited Jan 3 at 12:36

Stefan

77.5k895148

asked Jan 3 at 3:24

Obromios

4,63233368

asked Jan 3 at 3:24

Obromios

4,63233368

asked Jan 3 at 3:24

Obromios

4,63233368

2

You would like to read stackoverflow.com/a/9429972/10522579

– ray
Jan 3 at 7:07

1

You could just do File.read(file_name).

– Kimmo Lehto
Jan 3 at 9:27

add a comment |

2

You would like to read stackoverflow.com/a/9429972/10522579

– ray
Jan 3 at 7:07

1

You could just do File.read(file_name).

– Kimmo Lehto
Jan 3 at 9:27

You would like to read stackoverflow.com/a/9429972/10522579

– ray
Jan 3 at 7:07

You could just do File.read(file_name).

– Kimmo Lehto
Jan 3 at 9:27

add a comment |

3 Answers
3

active

oldest

votes

I just created a file named "t.txt" that contains "Hello, Worldn". We can read that as follows.

File.open('t.txt', 'r', &:read)

  #=> "Hello, Worldn"

Incidentally, as the default of the second argument is 'r', it suffices to write:

File.open('t.txt', &:read)

Here's another example:

"This is A Test".gsub('i', &:upcase)

  #=> "ThIs Is A Test"

In other words, include the proc (e.g., &:read) as the last argument.

edited Jan 3 at 12:02

Stefan

77.5k895148

answered Jan 3 at 3:41

Cary Swoveland

71k54167

add a comment |

File.open(file_name, 'r', &:read)

Rubocop wants you to use the 'symbol to proc' feature in Ruby instead of defining a complete block. This is purely stylistic, and doesn't affect the code execution. You can find it in the Rubocop style guide.

answered Jan 3 at 3:43

Tom

1,192718

1

Learned new things from you, thank you very much :)

– Tiw
Jan 3 at 16:38

add a comment |

You can look up the offense in RuboCop's docs, e.g. Style/SymbolProc – it usually shows a "bad" and a "good" example:

# bad

something.map { |s| s.upcase }



# good

something.map(&:upcase)

If this doesn't help, you can have RuboCop auto-correct the offense (for cops supporting auto-correction like this one).

Given a file test.rb:

# frozen_string_literal: true



File.open(file_name, 'r') { |file| file.read }

Run rubocop -a: (the actual output depends on your config)

$ rubocop -a test.rb

Inspecting 1 file

C



Offenses:



test.rb:3:27: C: [Corrected] Style/SymbolProc: Pass &:read as an argument to open instead of a block.

File.open(file_name, 'r') { |file| file.read }

                          ^^^^^^^^^^^^^^^^^^^^



1 file inspected, 1 offense detected, 1 offense corrected

And test.rb will become:

# frozen_string_literal: true



File.open(file_name, 'r', &:read)

edited Jan 3 at 12:42

answered Jan 3 at 12:33

Stefan

77.5k895148

add a comment |

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3 Answers
3

active

oldest

votes

3 Answers
3

active

oldest

votes

I just created a file named "t.txt" that contains "Hello, Worldn". We can read that as follows.

File.open('t.txt', 'r', &:read)

  #=> "Hello, Worldn"

Incidentally, as the default of the second argument is 'r', it suffices to write:

File.open('t.txt', &:read)

Here's another example:

"This is A Test".gsub('i', &:upcase)

  #=> "ThIs Is A Test"

In other words, include the proc (e.g., &:read) as the last argument.

edited Jan 3 at 12:02

Stefan

77.5k895148

answered Jan 3 at 3:41

Cary Swoveland

71k54167

add a comment |

I just created a file named "t.txt" that contains "Hello, Worldn". We can read that as follows.

File.open('t.txt', 'r', &:read)

  #=> "Hello, Worldn"

Incidentally, as the default of the second argument is 'r', it suffices to write:

File.open('t.txt', &:read)

Here's another example:

"This is A Test".gsub('i', &:upcase)

  #=> "ThIs Is A Test"

In other words, include the proc (e.g., &:read) as the last argument.

edited Jan 3 at 12:02

Stefan

77.5k895148

answered Jan 3 at 3:41

Cary Swoveland

71k54167

add a comment |

I just created a file named "t.txt" that contains "Hello, Worldn". We can read that as follows.

File.open('t.txt', 'r', &:read)

  #=> "Hello, Worldn"

Incidentally, as the default of the second argument is 'r', it suffices to write:

File.open('t.txt', &:read)

Here's another example:

"This is A Test".gsub('i', &:upcase)

  #=> "ThIs Is A Test"

In other words, include the proc (e.g., &:read) as the last argument.

edited Jan 3 at 12:02

Stefan

77.5k895148

answered Jan 3 at 3:41

Cary Swoveland

71k54167

I just created a file named "t.txt" that contains "Hello, Worldn". We can read that as follows.

File.open('t.txt', 'r', &:read)

  #=> "Hello, Worldn"

Incidentally, as the default of the second argument is 'r', it suffices to write:

File.open('t.txt', &:read)

Here's another example:

"This is A Test".gsub('i', &:upcase)

  #=> "ThIs Is A Test"

In other words, include the proc (e.g., &:read) as the last argument.

edited Jan 3 at 12:02

Stefan

77.5k895148

answered Jan 3 at 3:41

Cary Swoveland

71k54167

edited Jan 3 at 12:02

Stefan

77.5k895148

edited Jan 3 at 12:02

Stefan

77.5k895148

edited Jan 3 at 12:02

Stefan

77.5k895148

answered Jan 3 at 3:41

Cary Swoveland

71k54167

answered Jan 3 at 3:41

Cary Swoveland

71k54167

answered Jan 3 at 3:41

Cary Swoveland

71k54167

add a comment |

File.open(file_name, 'r', &:read)

answered Jan 3 at 3:43

Tom

1,192718

1

Learned new things from you, thank you very much :)

– Tiw
Jan 3 at 16:38

add a comment |

File.open(file_name, 'r', &:read)

answered Jan 3 at 3:43

Tom

1,192718

1

Learned new things from you, thank you very much :)

– Tiw
Jan 3 at 16:38

add a comment |

File.open(file_name, 'r', &:read)

answered Jan 3 at 3:43

Tom

1,192718

File.open(file_name, 'r', &:read)

answered Jan 3 at 3:43

Tom

1,192718

answered Jan 3 at 3:43

Tom

1,192718

answered Jan 3 at 3:43

Tom

1,192718

answered Jan 3 at 3:43

Tom

1,192718

1

Learned new things from you, thank you very much :)

– Tiw
Jan 3 at 16:38

add a comment |

1

Learned new things from you, thank you very much :)

– Tiw
Jan 3 at 16:38

Learned new things from you, thank you very much :)

– Tiw
Jan 3 at 16:38

add a comment |

You can look up the offense in RuboCop's docs, e.g. Style/SymbolProc – it usually shows a "bad" and a "good" example:

# bad

something.map { |s| s.upcase }



# good

something.map(&:upcase)

If this doesn't help, you can have RuboCop auto-correct the offense (for cops supporting auto-correction like this one).

Given a file test.rb:

# frozen_string_literal: true



File.open(file_name, 'r') { |file| file.read }

Run rubocop -a: (the actual output depends on your config)

$ rubocop -a test.rb

Inspecting 1 file

C



Offenses:



test.rb:3:27: C: [Corrected] Style/SymbolProc: Pass &:read as an argument to open instead of a block.

File.open(file_name, 'r') { |file| file.read }

                          ^^^^^^^^^^^^^^^^^^^^



1 file inspected, 1 offense detected, 1 offense corrected

And test.rb will become:

# frozen_string_literal: true



File.open(file_name, 'r', &:read)

edited Jan 3 at 12:42

answered Jan 3 at 12:33

Stefan

77.5k895148

add a comment |

You can look up the offense in RuboCop's docs, e.g. Style/SymbolProc – it usually shows a "bad" and a "good" example:

# bad

something.map { |s| s.upcase }



# good

something.map(&:upcase)

If this doesn't help, you can have RuboCop auto-correct the offense (for cops supporting auto-correction like this one).

Given a file test.rb:

# frozen_string_literal: true



File.open(file_name, 'r') { |file| file.read }

Run rubocop -a: (the actual output depends on your config)

$ rubocop -a test.rb

Inspecting 1 file

C



Offenses:



test.rb:3:27: C: [Corrected] Style/SymbolProc: Pass &:read as an argument to open instead of a block.

File.open(file_name, 'r') { |file| file.read }

                          ^^^^^^^^^^^^^^^^^^^^



1 file inspected, 1 offense detected, 1 offense corrected

And test.rb will become:

# frozen_string_literal: true



File.open(file_name, 'r', &:read)

edited Jan 3 at 12:42

answered Jan 3 at 12:33

Stefan

77.5k895148

add a comment |

You can look up the offense in RuboCop's docs, e.g. Style/SymbolProc – it usually shows a "bad" and a "good" example:

# bad

something.map { |s| s.upcase }



# good

something.map(&:upcase)

If this doesn't help, you can have RuboCop auto-correct the offense (for cops supporting auto-correction like this one).

Given a file test.rb:

# frozen_string_literal: true



File.open(file_name, 'r') { |file| file.read }

Run rubocop -a: (the actual output depends on your config)

$ rubocop -a test.rb

Inspecting 1 file

C



Offenses:



test.rb:3:27: C: [Corrected] Style/SymbolProc: Pass &:read as an argument to open instead of a block.

File.open(file_name, 'r') { |file| file.read }

                          ^^^^^^^^^^^^^^^^^^^^



1 file inspected, 1 offense detected, 1 offense corrected

And test.rb will become:

# frozen_string_literal: true



File.open(file_name, 'r', &:read)

edited Jan 3 at 12:42

answered Jan 3 at 12:33

Stefan

77.5k895148

You can look up the offense in RuboCop's docs, e.g. Style/SymbolProc – it usually shows a "bad" and a "good" example:

# bad

something.map { |s| s.upcase }



# good

something.map(&:upcase)

If this doesn't help, you can have RuboCop auto-correct the offense (for cops supporting auto-correction like this one).

Given a file test.rb:

# frozen_string_literal: true



File.open(file_name, 'r') { |file| file.read }

Run rubocop -a: (the actual output depends on your config)

$ rubocop -a test.rb

Inspecting 1 file

C



Offenses:



test.rb:3:27: C: [Corrected] Style/SymbolProc: Pass &:read as an argument to open instead of a block.

File.open(file_name, 'r') { |file| file.read }

                          ^^^^^^^^^^^^^^^^^^^^



1 file inspected, 1 offense detected, 1 offense corrected

And test.rb will become:

# frozen_string_literal: true



File.open(file_name, 'r', &:read)

edited Jan 3 at 12:42

answered Jan 3 at 12:33

Stefan

77.5k895148

edited Jan 3 at 12:42

answered Jan 3 at 12:33

Stefan

77.5k895148

answered Jan 3 at 12:33

Stefan

77.5k895148

answered Jan 3 at 12:33

Stefan

77.5k895148

add a comment |

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