Make your Rubies go faster with this command line tool highly inspired by fast-ruby and Sferik's talk at Baruco Conf.
Fasterer will suggest some speed improvements which you can check in detail at the fast-ruby repo.
Please note that you shouldn't follow the suggestions blindly. Using a while loop instead of a each_with_index probably shouldn't be considered if you're doing a regular Rails project, but maybe if you're doing something very speed dependent such as Rack or if you're building your own framework, you might consider this speed increase.
gem install fasterer
Run it from the root of your project:
fasterer
app/models/post.rb
Array#select.first is slower than Array#detect. Occured at lines: 57, 61.
db/seeds/cities.rb
Hash#keys.each is slower than Hash#each_key. Occured at lines: 15, 33.
test/options_test.rb
Hash#merge! with one argument is slower than Hash#[]. Occured at lines: 84.
test/module_test.rb
Don't rescue NoMethodError, rather check with respond_to?. Occured at lines: 272.
spec/cache/mem_cache_store_spec.rb
Use tr instead of gsub when grepping plain strings. Occured at lines: 161.
Configuration is done through the .fasterer.yml file placed in the root of your project.
Options:
- Turn off speed suggestions
- Blacklist files or complete folder paths
Example:
speedups:
rescue_vs_respond_to: true
module_eval: true
shuffle_first_vs_sample: true
for_loop_vs_each: true
each_with_index_vs_while: false
map_flatten_vs_flat_map: true
reverse_each_vs_reverse_each: true
select_first_vs_detect: true
sort_vs_sort_by: true
fetch_with_argument_vs_block: true
keys_each_vs_each_key: true
hash_merge_bang_vs_hash_brackets: true
block_vs_symbol_to_proc: true
proc_call_vs_yield: true
gsub_vs_tr: true
select_last_vs_reverse_detect: true
getter_vs_attr_reader: true
setter_vs_attr_writer: true
exclude_paths:
- 'vendor/**/*.rb'
- 'db/schema.rb'
- find vs bsearch
- Array#count vs Array#size
- Enumerable#each + push vs Enumerable#map
- Hash#merge vs Hash#merge!
- String#casecmp vs String#downcase + ==
- String concatenation
- String#match vs String#start_with?/String#end_with?
- String#gsub vs String#sub
- Fork it ( https://github.com/DamirSvrtan/fasterer/fork )
- Create your feature branch (
git checkout -b my-new-feature
) - Commit your changes (
git commit -am 'Add some feature'
) - Push to the branch (
git push origin my-new-feature
) - Create a new Pull Request