# How To? Set a watch breakpoint on a constant or variable

**URL:** <https://www.ruby-forum.com/t/how-to-set-a-watch-breakpoint-on-a-constant-or-variable/159557>\
**Category:** Ruby\
**Created:** [February 5, 2009, 7:12pm UTC](https://www.ruby-forum.com/t/how-to-set-a-watch-breakpoint-on-a-constant-or-variable/159557 "2009-02-05T19:12:57Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![byrnejb](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/d2c977/32.png) [@byrnejb](https://www.ruby-forum.com/u/byrnejb)\
**Post date:** [February 5, 2009, 7:12pm UTC](https://www.ruby-forum.com/t/how-to-set-a-watch-breakpoint-on-a-constant-or-variable/159557/1 "2009-02-05T19:12:57Z")

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How does one watch a ruby constant or variable in rdebug so that if the  
value changes then the program interrupts?