March 2019
Intermediate to advanced
584 pages
19h 5m
English
Content preview from The Well-Grounded Rubyist, Third Edition
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Chapter 15. Callbacks, hooks, and runtime introspection
This chapter covers
- Runtime callbacks: inherited, included, and more
- The respond_to? and method_missing methods
- Introspection of object and class-method lists
- Trapping unresolved constant references
- Examining in-scope variables and constants
- Parsing caller and stack trace information
In keeping with its dynamic nature and its encouragement of flexible, supple object and program design, Ruby provides a large number of ways to examine what’s going on while your program is running and to set up event-based callbacks and hooks—essentially, tripwires that are pulled at specified times and for specific reasons—in the form of methods with special, reserved names for ...
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