1978 != 1978


#1

I have these years that I am trying to compare to see if they are equal
and when my code get to the right year in question where it is supposed
to equate to true, it doesn’t. Here is my code:

<% 1900.upto(year) do |i| %>
<%= option_tag(i, i, @user.dobyear.to_s == i.to_s ? true : false) %>
<% end %>

When I do some ‘puts’ I get a condition where ‘1978’ == ‘1978’ and that
results in a false value and I can’t figure out why. Why in Ruby does
this happen? Thansk,

-S


#2

Hi –

On Sat, 20 Dec 2008, Shandy N. wrote:

I have these years that I am trying to compare to see if they are equal
and when my code get to the right year in question where it is supposed
to equate to true, it doesn’t. Here is my code:

<% 1900.upto(year) do |i| %>
<%= option_tag(i, i, @user.dobyear.to_s == i.to_s ? true : false) %>
<% end %>

An aside: == returns true or false, so you don’t have to do the whole
? true : false thing.

When I do some ‘puts’ I get a condition where ‘1978’ == ‘1978’ and that
results in a false value and I can’t figure out why. Why in Ruby does
this happen? Thansk,

Are there spaces around @user.dobyear? I’m not sure what you mean
about puts, except that puts returns nil, but I’m not sure how that
fits in with your question.

David


#3
  • Shandy N., 2008-12-20, 07:27:

does this happen?
It does not (checked). I suppose that the value of @user.dobyear only
looks as if it were ‘1978’ while in fact it contains some non-print
character. Try ‘p’ to verify.

And consider removing the ternary operator abuse. It makes not too much
sense to have it results in true (false) if @user.dobyear.to_s ==
i.to_s is true (false); I think using the truth value proper is the
variant one should prefer.

Josef ‘Jupp’ Schugt


#4

David A. Black wrote:

Hi –

On Sat, 20 Dec 2008, Shandy N. wrote:

An aside: == returns true or false, so you don’t have to do the whole
? true : false thing.

When I do some ‘puts’ I get a condition where ‘1978’ == ‘1978’ and that
results in a false value and I can’t figure out why. Why in Ruby does
this happen? Thansk,

Are there spaces around @user.dobyear? I’m not sure what you mean
about puts, except that puts returns nil, but I’m not sure how that
fits in with your question.

David

With ‘puts’ I just meant that I did some output statements to see if in
fact the values I was comparing were equal or not. As for the comparison
when I took out the true and false parts it worked, thanks,

-S