Ruby newbie. What's wrong with this code?
city_details['longitude'] + "," + city_details['latitude']
I get this error:
./player_location.rb:6:in `+': String can't be coerced into Float (TypeError)
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2 Answers
It looks like city_details['longitude'] and city_details['latitude'] are Float values.
You cannot add Float to a String in Ruby like this. You can either convert everything to String, and then + them, or use String interpolation.
city_details['longitude'].to_s + "," + city_details['latitude'].to_s
"#{city_details['longitude']},#{city_details['latitude']}"
Most Rubyists tend to use String interpolation.
1 Comment
Andrea Pavoni
interpolation is faster because ruby creates a unique String object, while using '+' creates a String for each operand. that's why most rubysts use interpolation.
It complains about the fact that you are trying to concatenate a float with a string.
The better way of doing this is by doing String interpolation:
"#{city_details['longitude']}, #{city_details['latitude']}"
Other possible solutions:
You could convert each float to string, by calling the
to_smethod like this:city_details['longitude'].to_s + "," + city_details['latitude'].to_sOr you could use the
joinmethod:[city_details['longitude'], city_details['latitude']].join(",")
answered Jun 18, 2011 at 16:07
Amokrane Chentir
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2 Comments
Andrea Pavoni
the first approach is 2x slower than interpolation, the second maybe worst.
Amokrane Chentir
Yes, it's correct. I edited my answer to point the best approach. However, it is good to know all the possible ways for doing this, because they might be useful in other cases.