Ruby - conversion string to float return 0.0

Question

In a variable is stored this value: $10.00 And I need to get this 10.00

I've tried to convert this value to float:

new_price = '%.2f' % (price.to_f)

but I get just 0.0.

What's wrong with that? I've tried also

price = price.strip
price[0]=""
new_price = '%.2f' % (price.to_f)

But even this didn't help me... where is a problem?

Thanks

Solution

You need to remove the $ first. The whole thing like this:

'%.2f' % '$10.00'.delete( "$" ).to_f

or

'%.2f' % '$10.00'[1..-1].to_f

if you like density and may encounter non dollars.

Comments

[user984621]

thanks for your answer, but the output is still just 10.0 instead of 10.00.

[froderik]

not for me 1.9.3-p392 :006 > '%.2f' % '$10.00'.delete( "$" ).to_f => "10.00"

[user984621]

In totally the same way as you do, the only difference is that the value is stored in database

[froderik]

ok - that is weird. You probably have to post a bit more code for me to have an idea. What ruby are you on?

[user984621]

I am running on ruby 1.9.3p385.