# Invalid value for

**URL:** <https://www.ruby-forum.com/t/invalid-value-for/156465>\
**Category:** Development\
**Created:** [December 28, 2008, 1:57pm UTC](https://www.ruby-forum.com/t/invalid-value-for/156465 "2008-12-28T13:57:36Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![Tadayoshi\_F](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/2bfe46/32.png) [@Tadayoshi\_F](https://www.ruby-forum.com/u/Tadayoshi_F)\
**Post date:** [December 28, 2008, 1:57pm UTC](https://www.ruby-forum.com/t/invalid-value-for/156465/1 "2008-12-28T13:57:36Z")

</div>

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main@191-20081228\> Integer(‘foo’)  
ArgumentError: invalid value for Integer: “foo”

main@191-20081228\> Float(‘foo’)  
ArgumentError: invalid value for Float(): “foo”

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<div class="post-metadata">

**Author:** ![Tadayoshi\_F](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/2bfe46/32.png) [@Tadayoshi\_F](https://www.ruby-forum.com/u/Tadayoshi_F)\
**Post date:** [December 28, 2008, 11:09pm UTC](https://www.ruby-forum.com/t/invalid-value-for/156465/2 "2008-12-28T23:09:21Z")

</div>

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In message “Re: [ruby-dev:37632] invalid value for”  
on Sun, 28 Dec 2008 21:56:19 +0900, Tadayoshi F.  
[removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) writes:

|e$B0J2\<$N$h$&$Ke(B Integer() e$B$He(B Float() e$B$G%(%i!\<$N%a%C%;!\<%8$,HyL/$K0c$$$^$9e(B  
|e$B$,e(B (e$B3g8L$,$“$k$+$I$&$+e(B)e$B!”$G$-$l$PB7$($?$$$H;W$$$^$9$,!"$I$C$A$,$$$$$G$7$ge(B  
|e$B$&$+e(B?  
|  
|main@191-20081228\> Integer(‘foo’)  
|ArgumentError: invalid value for Integer: “foo”  
|  
|main@191-20081228\> Float(‘foo’)  
|ArgumentError: invalid value for Float(): “foo”

e$B3g8L$,$"$kJ}$K0lI\<!#e(B

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<div class="post-metadata">

**Author:** ![Tadayoshi\_F](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/2bfe46/32.png) [@Tadayoshi\_F](https://www.ruby-forum.com/u/Tadayoshi_F)\
**Post date:** [December 29, 2008, 4:03am UTC](https://www.ruby-forum.com/t/invalid-value-for/156465/3 "2008-12-29T04:03:47Z")

</div>

e$B9bHx9(\<#$G$9!#e(B

On 2008/12/28, at 21:56, Tadayoshi F. wrote:

> e$B0J2\<$N$h$&$Ke(B Integer() e$B$He(B Float() e$B$G%(%i!\<$N%a%C%;!\<%8$,HyL/$K0c$$$^$9e(B  
> e$B$,e(B (e$B3g8L$,$"$k$+$I$&$+e(B)e$B!"$G$-$l$PB7$($?$$$H;W$$$^$9$,!"$I$C$A$,$$$$$G$7$ge(B  
> e$B$&$+e(B?
> 
> main@191-20081228\> Integer(‘foo’)  
> ArgumentError: invalid value for Integer: “foo”
> 
> main@191-20081228\> Float(‘foo’)  
> ArgumentError: invalid value for Float(): “foo”

e$B%P%C%/%H%l!\<%9$Ke(B Integer() e$B$de(B Float()  
e$B$N%a%=%C%IL\>$,4^$^$l$k;v$+$i!“e(B  
e$B%a%=%C%IL\>$r\>J$-!”!Ve(Binvalid value:  
"foo"e$B!W$H$$$&$N$O$$$+$,$G$7$g$&$+!#e(B

---

<div class="post-metadata">

**Author:** ![Tadayoshi\_F](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/2bfe46/32.png) [@Tadayoshi\_F](https://www.ruby-forum.com/u/Tadayoshi_F)\
**Post date:** [December 29, 2008, 5:08am UTC](https://www.ruby-forum.com/t/invalid-value-for/156465/4 "2008-12-29T05:08:04Z")

</div>

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In [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
“[ruby-dev:37638] Re: invalid value for” on Mon, 29 Dec 2008 12:03:04  
+0900,  
Takao K. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:

> e$B%P%C%/%H%l!\<%9$Ke(B Integer() e$B$de(B Float() e$B$N%a%=%C%IL\>$,4^$^$l$k;v$+$i!“e(B  
> e$B%a%=%C%IL\>$r\>J$-!”!Ve(Binvalid value: "foo"e$B!W$H$$$&$N$O$$$+$,$G$7$g$&$+!#e(B

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- ArgumentError: invalid integer value: “foo”
- ArgumentError: invalid float value: “foo”  
e$B$H$+!"e(B
- InvalidIntegerError: invalid value: “foo”
- InvalidFloatError: invalid value: “foo”  
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aliase$B$r$7$F$$$k$He(BIntegere$B$H$+$,%P%C%/%H%l!\<%9$+$i8+$($J$/$J$je(B  
e$B$^$9!#e(B  
alias convert\_to\_integer\_with\_validation Integer

---

<div class="post-metadata">

**Author:** ![Tadayoshi\_F](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/2bfe46/32.png) [@Tadayoshi\_F](https://www.ruby-forum.com/u/Tadayoshi_F)\
**Post date:** [December 29, 2008, 11:50am UTC](https://www.ruby-forum.com/t/invalid-value-for/156465/5 "2008-12-29T11:50:13Z")

</div>

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