preval | Automatically optimizes your Ruby code

preval is a Ruby library. preval has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can download it from GitHub.

preval is a gem that hooks into the Ruby compilation process and runs optimizations before it gets loaded by the virtual machine. Certain optimizations that are common in compilers are not immediately possible with Ruby on account of Ruby's flexibility. For example, most compilers will run through a process called constant folding to eliminate the need to perform extraneous operations at runtime (e.g., 5 + 2 in the source can be replaced with 7). However, because Ruby allows you to override the Integer#+ method, it's possible that 5 + 2 would not evaluate to 7. preval assumes that most developers will not override the Integer#+ method, and performs optimizations under that assumption. Users must opt in to each of preval's optimizations, as there's no real way of telling whether or not it is 100% safe for any codebase. The more optimizations are allowed to run, the more time and memory savings later. Users can also define their own optimizations by subclassing the Preval::Visitor class and using the existing Preval::Node APIs to replace and update the Ruby AST as necessary.