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Wow Code, Such Read! (RubyConf Colombia)

Katherine Wu
September 03, 2016

Wow Code, Such Read! (RubyConf Colombia)

Abstract:
When we learn to code, that usually means learning how to *write* code. However in practice, we spend a lot of time *reading* code instead! It’s the way we find answers to questions about how things work. Reading code efficiently is therefore a very valuable skill. This talk will cover how Ruby developers can improve this skill, with tips for comprehending and debugging code faster. We'll also take a look at how you’d go one level deeper and read Ruby’s own source code, even if you don’t know much about C!

This talk was presented at RubyConf Colombia 2016 in Medellín, ~32 minutes: https://youtu.be/u2VrYZDh-4g
Blog post: http://kwugirl.blogspot.com/2016/05/wow-code-such-read.html

Katherine Wu

September 03, 2016
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Transcript

  1. @kwugirl { :sql=>
 "SELECT \"blogs\".* FROM \"blogs\" WHERE \"blogs\".\"id \"

    = $1 LIMIT 1", … :binds=> [[#<ActiveRecord::ConnectionAdapters::PostgreSQLColumn: 0x007fd13a879e58 @array=false, @cast_type=#<ActiveRecord::ConnectionAdapters::PostgreS QL::OID::Integer:0x007fd13a87afd8 @limit=nil, @precision=nil, @range=-2147483648...2147483648, @scale=nil>,…,42]] } ActiveSupport::Notifications.subscribe 'sql.active_record'
  2. @kwugirl { :sql=>
 "SELECT \"blogs\".* FROM \"blogs\" WHERE \"blogs\".\"id \"

    = $1 LIMIT 1", … :binds=> [[#<ActiveRecord::ConnectionAdapters::PostgreSQLColumn: 0x007fd13a879e58 @array=false, @cast_type=#<ActiveRecord::ConnectionAdapters::PostgreS QL::OID::Integer:0x007fd13a87afd8 @limit=nil, @precision=nil, @range=-2147483648...2147483648, @scale=nil>,…,42]] } ActiveSupport::Notifications.subscribe 'sql.active_record'
  3. @kwugirl @instrumenter.instrument( "sql.active_record", :sql => sql, :name => name, :connection_id

    => object_id, :statement_name => statement_name, :binds => binds) { yield } def log(sql, name = "SQL", binds = [], statement_name = nil) # active_record/connection_adapters/abstract_adapter.rb
  4. @kwugirl @instrumenter.instrument( "sql.active_record", :sql => sql, :name => name, :connection_id

    => object_id, :statement_name => statement_name, :binds => binds) { yield } def log(sql, name = "SQL", binds = [], statement_name = nil) # active_record/connection_adapters/abstract_adapter.rb
  5. @kwugirl @instrumenter.instrument( "sql.active_record", :sql => sql, :name => name, :connection_id

    => object_id, :statement_name => statement_name, :binds => binds) { yield } def log(sql, name = "SQL", binds = [], statement_name = nil) # active_record/connection_adapters/abstract_adapter.rb
  6. @kwugirl def log(sql, name = "SQL", binds = [], statement_name

    = nil) @instrumenter.instrument( "sql.active_record", :sql => sql, :name => name, :connection_id => object_id, :statement_name => statement_name, :binds => binds) { yield } puts "====== HELLO IS IT ME YOU'RE LOOKING FOR?!!?? ======" # active_record/connection_adapters/abstract_adapter.rb
  7. @kwugirl active_record/connection_adapters/postgresql_adapter.rb:601:in `exec_cache' active_record/connection_adapters/postgresql_adapter.rb:585:in `execute_and_clear' active_record/connection_adapters/postgresql/database_statements.rb:161:in `exec_query' active_record/connection_adapters/abstract/database_statements.rb:341:in `select' active_record/connection_adapters/abstract/database_statements.rb:37:in

    `select_all' active_record/connection_adapters/abstract/query_cache.rb:70:in `select_all' active_record/querying.rb:39:in `find_by_sql' active_record/relation.rb:639:in `exec_queries' active_record/relation.rb:514:in `load' active_record/relation.rb:243:in `to_a' active_record/relation.rb:617:in `pretty_print' Kernel#caller
  8. @kwugirl resources Jason Clark’s talk “GDB: A Gentle Intro” Hsing-Hui

    Hsu’s talk “Time flies like an arrow, fruit flies like a banana”
  9. @kwugirl resources Jason Clark’s talk “GDB: A Gentle Intro” Hsing-Hui

    Hsu’s talk “Time flies like an arrow, fruit flies like a banana” Ruby Under A Microscope
  10. @kwugirl resources Jason Clark’s talk “GDB: A Gentle Intro” Hsing-Hui

    Hsu’s talk “Time flies like an arrow, fruit flies like a banana” Ruby Under A Microscope Definitive Guide to Ruby’s C API: 
 https://silverhammermba.github.io/emberb/c/
  11. @kwugirl Net::HTTP is maybe 2000 lines of code, not including

    comments. It has ~1000 lines of comments… Julia Evans jvns.ca
  12. @kwugirl Net::HTTP is maybe 2000 lines of code, not including

    comments. It has ~1000 lines of comments… I can read 2000 lines of code, Julia Evans jvns.ca
  13. @kwugirl Net::HTTP is maybe 2000 lines of code, not including

    comments. It has ~1000 lines of comments… I can read 2000 lines of code, mostly! Julia Evans jvns.ca
  14. @kwugirl doge The White Rabbit, Alice in Wonderland sad Keanu

    pear/pair programming Lionel Richie + Where’s Waldo !!1!one!! the “!1” phenomenon breadfish Slurms MacKenzie, Futurama
  15. @kwugirl This document and the information herein (including any information

    that may be incorporated by reference) is provided for informational purposes only and should not be construed as an offer, commitment, promise or obligation on behalf of New Relic, Inc. (“New Relic”) to sell securities or deliver any product, material, code, functionality, or other feature. Any information provided hereby is proprietary to New Relic and may not be replicated or disclosed without New Relic’s express written permission. Such information may contain forward-looking statements within the meaning of federal securities laws. Any statement that is not a historical fact or refers to expectations, projections, future plans, objectives, estimates, goals, or other characterizations of future events is a forward-looking statement. These forward-looking statements can often be identified as such because the context of the statement will include words such as “believes,” “anticipates,” “expects” or words of similar import. Actual results may differ materially from those expressed in these forward-looking statements, which speak only as of the date hereof, and are subject to change at any time without notice. Existing and prospective investors, customers and other third parties transacting business with New Relic are cautioned not to place undue reliance on this forward-looking information. The achievement or success of the matters covered by such forward-looking statements are based on New Relic’s current assumptions, expectations, and beliefs and are subject to substantial risks, uncertainties, assumptions, and changes in circumstances that may cause the actual results, performance, or achievements to differ materially from those expressed or implied in any forward-looking statement. Further information on factors that could affect such forward-looking statements is included in the filings we make with the SEC from time to time. Copies of these documents may be obtained by visiting New Relic’s Investor Relations website at ir.newrelic.com or the SEC’s website at www.sec.gov. New Relic assumes no obligation and does not intend to update these forward-looking statements, except as required by law. New Relic makes no warranties, expressed or implied, in this document or otherwise, with respect to the information provided.