# Changing Value of a constant

**URL:** <https://www.ruby-forum.com/t/changing-value-of-a-constant/225223>\
**Category:** Rails\
**Created:** [December 21, 2012, 11:20pm UTC](https://www.ruby-forum.com/t/changing-value-of-a-constant/225223 "2012-12-21T23:20:41Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![aris](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/258eb7/32.png) [@aris](https://www.ruby-forum.com/u/aris)\
**Post date:** [December 21, 2012, 11:20pm UTC](https://www.ruby-forum.com/t/changing-value-of-a-constant/225223/1 "2012-12-21T23:20:41Z")

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I am shocked that we can change the value of constant in ruby!! is there  
any meaning if we can change the value of a constant!! I am not getting  
this,plz help!

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**Author:** ![niravbhatu](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/82dd89/32.png) [@niravbhatu](https://www.ruby-forum.com/u/niravbhatu)\
**Post date:** [December 22, 2012, 12:34am UTC](https://www.ruby-forum.com/t/changing-value-of-a-constant/225223/2 "2012-12-22T00:34:40Z")

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Nirav B. wrote in post #1089902:

> I am shocked that we can change the value of constant in ruby!!

What about this:

class Dog  
def initialize(password)  
@secret = password  
end  
end

d = Dog.new(“flower52”)  
puts d.instance\_eval(“@secret”)

–output:–  
flower52

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**Author:** ![niravbhatu](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/82dd89/32.png) [@niravbhatu](https://www.ruby-forum.com/u/niravbhatu)\
**Post date:** [December 21, 2012, 11:32pm UTC](https://www.ruby-forum.com/t/changing-value-of-a-constant/225223/3 "2012-12-21T23:32:23Z")

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On 21 Dec, 06:58, Nirav B. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:

> I am shocked that we can change the value of constant in ruby!! is there  
> any meaning if we can change the value of a constant!! I am not getting  
> this,plz help!

Ruby lets you do most things if you want to - calling private methods,  
changing constants, redefining methods on core classes - with great  
power comes great responsibility!

Fred