Difference between revisions of "Text File Writer Assignment"

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==Yield==
 
==Yield==
 
[https://www.rubyguides.com/2019/12/yield-keyword/ yield]
 
[https://www.rubyguides.com/2019/12/yield-keyword/ yield]
 +
 +
[https://apidock.com/ruby/Kernel/block_given%3F block_given?]
 +
 +
==File==
 +
[https://apidock.com/ruby/v2_5_5/File/new/class File.new(path, mode)]
 +
 +
file.close()
  
 
=Code To Implement=
 
=Code To Implement=

Revision as of 05:21, 25 November 2022

Background

Ensure

Ruby provides begin/rescue/ensure which is rather analogous to try/catch/finally in Java.

note: although coincidental, it is rather fitting that this reference covers begin/rescue/ensure with ensuring to close an opened file as its example. Ensuring to close an opened file is the canonical example for this sort of feature.

Yield

yield

block_given?

File

File.new(path, mode)

file.close()

Code To Implement

TextFileUtils

file: src/main/ruby/text_file_utils/text_file_utils.rb Ruby logo.svg
class: TextFileUtils
superclass: Object
methods: write_text(path)

write_text(path)

Create a new File for the specified path in write mode.

If a block is given, yield the file to that block and ensure that you close the file. Return the closed file.

If no block is given, return the opened file.

Client

file to run: src/main/ruby/text_file_utils/text_file_utils.rb Ruby logo.svg

In the same file you edit class TextFileUtils, you will find a simple client:

TextFileUtils.write_text(path) do |file|
  file.write("<html><body><h1>#{Time.now}</h1></body></html>")
end

Testing Your Solution

file: src/test/ruby/text_file_utils/text_file_utils.rb Ruby logo.svg UnitTest

note: ensure that you have removed all printing to receive credit for any assignment.