Question 1

How reliable are Fast Ruby benchmarks for older Ruby versions?

Accepted Answer

Fast Ruby benchmarks are typically run on recent Ruby versions, and performance can differ in older releases. The README notes that results may vary, so it's best to run your own benchmarks if using a different version to ensure accuracy.

Question 2

Fast Ruby vs fasterer: which should I use first?

Accepted Answer

Fast Ruby is a reference guide for understanding performance idioms through benchmarks, while fasterer is a static analysis tool that checks your code against these idioms. Start with Fast Ruby to learn the patterns, then use fasterer to automate checks in your codebase.

Question 3

How can I add my own benchmarks to Fast Ruby?

Accepted Answer

You can contribute by forking the GitHub repository, adding benchmark code in the appropriate category under the 'code' directory, and submitting a pull request. The project uses benchmark-ips for consistency, as outlined in the README.

Question 4

Does Fast Ruby cover all performance aspects of Ruby on Rails?

Accepted Answer

Fast Ruby focuses on core Ruby idioms, so while many optimizations apply to Rails, it doesn't specifically address Rails-specific methods or patterns. For Rails performance, you might need supplementary resources or benchmarks.

Question 5

When should I avoid using Fast Ruby's faster idioms?

Accepted Answer

Avoid using faster idioms when they reduce code clarity, introduce bugs, or when the performance gain is negligible in your context. The README warns that replacements depend on context, like with gsub versus tr, so always measure and consider trade-offs.

Question 6

How to benchmark Ruby code like Fast Ruby does?

Accepted Answer

Use the benchmark-ips gem as recommended in the README. Set up test cases similar to those in the 'code' directory, run iterations, and compare results. The README provides a template to get started with consistent benchmarking.

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