I want to debug the code to understand how the reduce the values of block passing to the hash length #78

sadmanahmed · 2020-06-15T20:21:56Z

states = ["Kansas","Nebraska", "North Dakota", "South Dakota"]

# lengths: Functional version
def functional_lengths(states)
  states.reduce({}) do |lengths, state|
    lengths[state] = state.length
    lengths
  end
end
puts functional_lengths(states)
#answer : {"Kansas"=>6, "Nebraska"=>8, "North Dakota"=>12, "South Dakota"=>12}

The text was updated successfully, but these errors were encountered:

wasifhossain · 2020-06-16T01:19:23Z

just put binding.pry in the 1st line of the reduce block

sadmanahmed · 2020-06-16T19:14:46Z

may I know Exactly where because I tried 3 different place and get this error

functional.rb:113:in `<main>': undefined method `pry' for #<Binding:0x000055718ec50e18> (NoMethodError)

sadmanahmed · 2020-06-16T19:16:01Z

the line mentioning would be more helpful

sadmanahmed · 2020-06-16T19:20:49Z

Do I need to add require "pry"?

sadmanahmed · 2020-06-16T19:39:42Z

def functional_lenghts(states)
  binding.pry
  states.reduce({}) do |lengths,state|

    lengths[state]=state.length
    lengths
  end
end
puts functional_lenghts(states)

error

Traceback (most recent call last):
	1: from functional.rb:122:in `<main>'
functional.rb:115:in `functional_lenghts': undefined method `pry' for #<Binding:0x0000561b91bf0dd0> (NoMethodError)

wasifhossain · 2020-06-16T22:00:49Z

def functional_lenghts(states)
  binding.pry
  states.reduce({}) do |lengths,state|

👆 thats the 1st line of the functional_lengths method

So

just put binding.pry in the 1st line of the reduce block

would be

def functional_lenghts(states)
  states.reduce({}) do |lengths,state|
    binding.pry

wasifhossain · 2020-06-16T22:02:44Z

the error points you to require 'pry' before using it. make sure that you have the gem installed

Traceback (most recent call last):
	1: from functional.rb:122:in `<main>'
functional.rb:115:in `functional_lenghts': undefined method `pry' for #<Binding:0x0000561b91bf0dd0> (NoMethodError)

sadmanahmed · 2020-06-16T22:03:48Z

But I have used pry in my previous project

wasifhossain · 2020-06-16T22:05:03Z

how are you running the file? is it part of a rails project or just a standalone file running from the command line

sadmanahmed · 2020-06-16T22:06:29Z

Understood .. It is a part of project. I have installed it .

sadmanahmed · 2020-06-16T22:25:59Z

I am using a sinatra based project for learning . So I first type this : gem install pry but what should the next command? bundle update/bundle install as typing pry is not working

ruby_totorial git:(master) ✗ pry
bundler: failed to load command: pry (/home/abir/.rvm/gems/ruby-2.6.5/bin/pry)
Gem::Exception: can't find executable pry for gem pry. pry is not currently included in the bundle, perhaps you meant to add it to your Gemfile?
  /home/abir/.rvm/gems/ruby-2.6.5/gems/bundler-2.1.4/lib/bundler/rubygems_integration.rb:374:in `block in replace_bin_path'
  /home/abir/.rvm/gems/ruby-2.6.5/gems/bundler-2.1.4/lib/bundler/rubygems_integration.rb:402:in `block in replace_bin_path'
  /home/abir/.rvm/gems/ruby-2.6.5/bin/pry:23:in `<top (required)>'

wasifhossain · 2020-06-16T22:28:16Z

there is a Gemfile in the project, isn't it? if yes, then you should add pry to that and run bundle install instead of gem install pry

sadmanahmed · 2020-06-16T22:30:35Z

bundle install was taking too much time actually that is why I tried to install manually.

wasifhossain · 2020-06-16T22:32:06Z

ruby projects has own style of running stuffs. we just need to adhere to the rules

sadmanahmed · 2020-06-16T22:33:39Z

bundle install taking too much time, is it normal?

wasifhossain · 2020-06-16T22:34:52Z

around 5 min?

sadmanahmed · 2020-06-16T22:36:00Z

still in same place after bundle install started

wasifhossain · 2020-06-16T22:47:08Z

you can tell bundle install to download in parallel

e.g.

bundle install --jobs=4

would download 4 gems in parallel and hence save some time

sadmanahmed · 2020-06-17T12:13:06Z

What is the error as just added pry

 ruby_totorial git:(master) ✗ bundle install
Fetching gem metadata from https://rubygems.org/.......
Resolving dependencies...
Using bundler 2.1.4
Using ruby2_keywords 0.0.2
Using method_source 0.9.2
Fetching coderay 1.1.3
Using rack 2.2.2
Using mustermann 1.1.1
Using tilt 2.0.10
Using rack-protection 2.0.8.1
Using sinatra 2.0.8.1
Installing coderay 1.1.3
Using pry 0.12.2
Bundle complete! 2 Gemfile dependencies, 10 gems now installed.
Use `bundle info [gemname]` to see where a bundled gem is installed.

error

ruby_totorial git:(master) ✗ ruby test.rb
Traceback (most recent call last):
	4: from test.rb:13:in `<main>'
	3: from test.rb:6:in `functional_lenghts'
	2: from test.rb:6:in `reduce'
	1: from test.rb:6:in `each'
test.rb:7:in `block in functional_lenghts': undefined method `pry' for #<Binding:0x0000557a527a4cf8> (NoMethodError)

wasifhossain · 2020-06-17T17:46:36Z

can you retry after uncommenting line 1 (require 'pry')

sadmanahmed · 2020-06-17T17:48:29Z

ruby_totorial git:(master) ✗ ruby test.rb
Traceback (most recent call last):
	4: from test.rb:13:in `<main>'
	3: from test.rb:6:in `functional_lenghts'
	2: from test.rb:6:in `reduce'
	1: from test.rb:6:in `each'
test.rb:7:in `block in functional_lenghts': undefined method `pry' for #<Binding:0x000055c2a74dc8c0> (NoMethodError)
➜  ruby_totorial git:(master) ✗ ruby test.rb
Traceback (most recent call last):
	2: from test.rb:1:in `<main>'
	1: from /home/abir/.rvm/rubies/ruby-2.6.5/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
/home/abir/.rvm/rubies/ruby-2.6.5/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require': cannot load such file -- pry (LoadError)
	20: from test.rb:1:in `<main>'
	19: from /home/abir/.rvm/rubies/ruby-2.6.5/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:34:in `require'
	18: from /home/abir/.rvm/rubies/ruby-2.6.5/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:130:in `rescue in require'
	17: from /home/abir/.rvm/rubies/ruby-2.6.5/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:130:in `require'
	16: from /home/abir/.rvm/gems/ruby-2.6.5/gems/pry-0.13.1/lib/pry.rb:78:in `<top (required)>'
	15: from /home/abir/.rvm/rubies/ruby-2.6.5/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	14: from /home/abir/.rvm/rubies/ruby-2.6.5/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	13: from /home/abir/.rvm/gems/ruby-2.6.5/gems/pry-0.13.1/lib/pry/cli.rb:134:in `<top (required)>'
	12: from /home/abir/.rvm/gems/ruby-2.6.5/gems/pry-0.13.1/lib/pry/cli.rb:40:in `add_plugin_options'
	11: from /home/abir/.rvm/gems/ruby-2.6.5/gems/pry-0.13.1/lib/pry/cli.rb:40:in `each'
	10: from /home/abir/.rvm/gems/ruby-2.6.5/gems/pry-0.13.1/lib/pry/plugins.rb:55:in `load_cli_options'
	 9: from /home/abir/.rvm/rubies/ruby-2.6.5/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	 8: from /home/abir/.rvm/rubies/ruby-2.6.5/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	 7: from /home/abir/.rvm/gems/ruby-2.6.5/gems/pry-byebug-3.7.0/lib/pry-byebug/cli.rb:5:in `<top (required)>'
	 6: from /home/abir/.rvm/rubies/ruby-2.6.5/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	 5: from /home/abir/.rvm/rubies/ruby-2.6.5/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	 4: from /home/abir/.rvm/gems/ruby-2.6.5/gems/pry-byebug-3.7.0/lib/pry-byebug/commands.rb:12:in `<top (required)>'
	 3: from /home/abir/.rvm/rubies/ruby-2.6.5/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	 2: from /home/abir/.rvm/rubies/ruby-2.6.5/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	 1: from /home/abir/.rvm/gems/ruby-2.6.5/gems/pry-byebug-3.7.0/lib/pry-byebug/commands/exit_all.rb:3:in `<top (required)>'
/home/abir/.rvm/gems/ruby-2.6.5/gems/pry-byebug-3.7.0/lib/pry-byebug/commands/exit_all.rb:7:in `<module:PryByebug>': uninitialized constant Pry::Command::ExitAll (NameError)
➜  ruby_totorial git:(master) ✗

wasifhossain · 2020-06-17T19:35:15Z

can we see the Gemfile

sadmanahmed · 2020-06-17T19:40:58Z

source 'https://rubygems.org'
gem 'sinatra'
gem 'pry', '~> 0.12.2'

wasifhossain · 2020-06-17T20:01:58Z

can you share the output of gem list pry

sadmanahmed · 2020-06-17T20:36:34Z

ruby_totorial git:(master) ✗ gem list pry  

*** LOCAL GEMS ***

pry (0.13.1, 0.13.0, 0.12.2)
pry-byebug (3.7.0)
pry-rails (0.3.9)

wasifhossain · 2020-06-18T06:10:19Z

and Gemfile.lock

sadmanahmed · 2020-06-18T09:45:48Z

GEM
  remote: https://rubygems.org/
  specs:
    coderay (1.1.3)
    method_source (0.9.2)
    mustermann (1.1.1)
      ruby2_keywords (~> 0.0.1)
    pry (0.12.2)
      coderay (~> 1.1.0)
      method_source (~> 0.9.0)
    rack (2.2.2)
    rack-protection (2.0.8.1)
      rack
    ruby2_keywords (0.0.2)
    sinatra (2.0.8.1)
      mustermann (~> 1.0)
      rack (~> 2.0)
      rack-protection (= 2.0.8.1)
      tilt (~> 2.0)
    tilt (2.0.10)

PLATFORMS
  ruby

DEPENDENCIES
  pry (~> 0.12.2)
  sinatra

BUNDLED WITH
   2.1.4

wasifhossain · 2020-06-18T17:49:17Z

could you add pry-byebug too in the Gemfile, run bundle install and retry test.rb if you can overcome the error

sadmanahmed · 2020-06-18T18:31:50Z

 ruby_totorial git:(master) ✗ bundle install
Fetching source index from https://rubygems.org/
Resolving dependencies....
Using bundler 2.1.4
Using method_source 0.9.2
Using coderay 1.1.3
Using ruby2_keywords 0.0.2
Using tilt 2.0.10
Using pry 0.12.2
Using mustermann 1.1.1
Fetching byebug 11.1.3
Using rack 2.2.2
Using rack-protection 2.0.8.1
Using sinatra 2.0.8.1
Installing byebug 11.1.3 with native extensions
Fetching pry-byebug 3.8.0
Installing pry-byebug 3.8.0
Bundle complete! 3 Gemfile dependencies, 12 gems now installed.
Use `bundle info [gemname]` to see where a bundled gem is installed.
➜  ruby_totorial git:(master) ✗ ruby test.rb  
Traceback (most recent call last):
	2: from test.rb:1:in `<main>'
	1: from /home/abir/.rvm/rubies/ruby-2.6.5/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
/home/abir/.rvm/rubies/ruby-2.6.5/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require': cannot load such file -- pry (LoadError)
	20: from test.rb:1:in `<main>'
	19: from /home/abir/.rvm/rubies/ruby-2.6.5/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:34:in `require'
	18: from /home/abir/.rvm/rubies/ruby-2.6.5/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:130:in `rescue in require'
	17: from /home/abir/.rvm/rubies/ruby-2.6.5/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:130:in `require'
	16: from /home/abir/.rvm/gems/ruby-2.6.5/gems/pry-0.13.1/lib/pry.rb:78:in `<top (required)>'
	15: from /home/abir/.rvm/rubies/ruby-2.6.5/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	14: from /home/abir/.rvm/rubies/ruby-2.6.5/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	13: from /home/abir/.rvm/gems/ruby-2.6.5/gems/pry-0.13.1/lib/pry/cli.rb:134:in `<top (required)>'
	12: from /home/abir/.rvm/gems/ruby-2.6.5/gems/pry-0.13.1/lib/pry/cli.rb:40:in `add_plugin_options'
	11: from /home/abir/.rvm/gems/ruby-2.6.5/gems/pry-0.13.1/lib/pry/cli.rb:40:in `each'
	10: from /home/abir/.rvm/gems/ruby-2.6.5/gems/pry-0.13.1/lib/pry/plugins.rb:55:in `load_cli_options'
	 9: from /home/abir/.rvm/rubies/ruby-2.6.5/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	 8: from /home/abir/.rvm/rubies/ruby-2.6.5/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	 7: from /home/abir/.rvm/gems/ruby-2.6.5/gems/pry-byebug-3.8.0/lib/pry-byebug/cli.rb:5:in `<top (required)>'
	 6: from /home/abir/.rvm/rubies/ruby-2.6.5/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	 5: from /home/abir/.rvm/rubies/ruby-2.6.5/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	 4: from /home/abir/.rvm/gems/ruby-2.6.5/gems/pry-byebug-3.8.0/lib/pry-byebug/commands.rb:12:in `<top (required)>'
	 3: from /home/abir/.rvm/rubies/ruby-2.6.5/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	 2: from /home/abir/.rvm/rubies/ruby-2.6.5/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
	 1: from /home/abir/.rvm/gems/ruby-2.6.5/gems/pry-byebug-3.8.0/lib/pry-byebug/commands/exit_all.rb:3:in `<top (required)>'
/home/abir/.rvm/gems/ruby-2.6.5/gems/pry-byebug-3.8.0/lib/pry-byebug/commands/exit_all.rb:7:in `<module:PryByebug>': uninitialized constant Pry::Command::ExitAll (NameError)

wasifhossain · 2020-06-18T18:38:45Z

source 'https://rubygems.org'
gem 'sinatra'
gem 'pry', '~> 0.12.2'

change pry version to 0.13.1, like

gem 'pry', '~> 0.13.1'

run bundle install and bundle update pry-byebug too. then give test.rb one more try

Ref: pry/pry#2121 (comment)

sadmanahmed · 2020-06-18T18:53:20Z

vaia
It is working but now what to do to see the structure?

ruby_totorial git:(master) ✗ ruby test.rb  

From: /home/abir/repos/ruby_totorial/test.rb:9 Object#functional_lenghts:

     5: def functional_lenghts(states)
     6:   states.reduce({}) do |lengths,state|
     7:    binding.pry
     8: 
 =>  9:     lengths[state]=state.length
    10:     lengths
    11:   end
    12: end

[1] pry(main)>

I want to see how the datas are processing and holding the values again in a hash function

wasifhossain · 2020-06-18T18:56:45Z

just check the value of the variables inside the current scope, e.g lengths, state etc

in order to jump to the next iteration, use exit or ctrl+D.

sadmanahmed · 2020-06-18T18:59:53Z

ruby_totorial git:(master) ✗ ruby test.rb  

From: /home/abir/repos/ruby_totorial/test.rb:9 Object#functional_lenghts:

     5: def functional_lenghts(states)
     6:   states.reduce({}) do |lengths,state|
     7:    binding.pry
     8: 
 =>  9:     lengths[state]=state.length
    10:     lengths
    11:   end
    12: end

[1] pry(main)> state = Kansas
NameError: uninitialized constant Kansas
from (pry):1:in `block in functional_lenghts'
[2] pry(main)> state =" Kansas"
=> " Kansas"
[3] pry(main)> 
[4] pry(main)> 

From: /home/abir/repos/ruby_totorial/test.rb:9 Object#functional_lenghts:

     5: def functional_lenghts(states)
     6:   states.reduce({}) do |lengths,state|
     7:    binding.pry
     8: 
 =>  9:     lengths[state]=state.length
    10:     lengths
    11:   end
    12: end

[1] pry(main)> 

From: /home/abir/repos/ruby_totorial/test.rb:9 Object#functional_lenghts:

     5: def functional_lenghts(states)
     6:   states.reduce({}) do |lengths,state|
     7:    binding.pry
     8: 
 =>  9:     lengths[state]=state.length
    10:     lengths
    11:   end
    12: end

[1] pry(main)> 

From: /home/abir/repos/ruby_totorial/test.rb:9 Object#functional_lenghts:

     5: def functional_lenghts(states)
     6:   states.reduce({}) do |lengths,state|
     7:    binding.pry
     8: 
 =>  9:     lengths[state]=state.length
    10:     lengths
    11:   end
    12: end

[1] pry(main)> 
{" Kansas"=>7, "Nebraska"=>8, "North Dakota"=>12, "South Dakota"=>12}

Maybe I am doing something wrong .

sadmanahmed · 2020-06-18T19:04:32Z

Is this work something like this?

ruby_totorial git:(master) ✗ ruby test.rb

From: /home/abir/repos/ruby_totorial/test.rb:9 Object#functional_lenghts:

     5: def functional_lenghts(states)
     6:   states.reduce({}) do |lengths,state|
     7:    binding.pry
     8: 
 =>  9:     lengths[state]=state.length
    10:     lengths
    11:   end
    12: end

[1] pry(main)> state
=> "Kansas"
[2] pry(main)> lengths
=> {}
[3] pry(main)> state.length
=> 6
[4] pry(main)>

sadmanahmed closed this as completed Jun 19, 2020

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I want to debug the code to understand how the reduce the values of block passing to the hash length #78

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I want to debug the code to understand how the reduce the values of block passing to the hash length #78

I want to debug the code to understand how the reduce the values of block passing to the hash length #78

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