ruby - Array of strings to float values can correctly sort negative numbers but same values using sprintf, kernel.format, etc. sort incorrectly -

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Why can string.to_float sort a array of values ​​correctly, but those same values ​​are sorted incorrectly When '% .3f'%

I am currently working on a challenge that provides you a text file. The rows filled with numbers (example) are:

1.123 -3.010 3.999 -2.199 -1.212 2.190 4.121 0.000

My goal is to sort these numbers And print them to console them properly

Try it for the first time, divide these lines into their respective string numbers, then change them to Floating Point Value with .to_f Give, and lastly, sort them and give them one Date back to us (space delimited).

It looked something like this: 

  line.chomp.split ("") .map {| e E.to_f} .sort! .join ("")   
 By the time I did not realize that any number in the exact three decimal places like 68.060 has ended, then the last zero will be lost. And thus, instead of 68.060, shows as 68.060 which invalidates the solution.  
 I went around and found a lot of references:  
  kernel.format ('% .3f', digits)   
 and  
  sprintf '% .3f'% num   
 These were correct, they solved the problem I applied them to them like this (Tried differentiation but they used to do the same work):  
  line.chomp.split ("") .map {| e sprintf '% .3f', e} .sort! .join ("")   
 Then I found myself looking for another problem, though. Each row put in the console arranged the negative numbers as they were positive numbers, so instead:  
 
 -3.010 -2.199 -1.212 0.000 1.123 2.190 3.999 4.121   
 On the console, I was looking at:  
 
 -1.212 -2.199 -3.010 0.000 1.123 2.1 9 3.99 9 4.121   
 This is an I Could not find it too much It could be my fault that I do not know exactly at Google, but none of my searches was able to hit anything on the relevant.   p> You are sorting the array  after that  you have formatted it in an array of stars, this means that your array is classifying elements, Not numerically.  
 You should first map your array to float values, and then sort it:  
  line.chomp.split ("") .map (& amp; ;: To_f) .sort   
 You can now properly format the number:  
  line.chomp.split ("") .map (And: to_f) .sort.map {| e sprintf '% .3f', e}. Include ("")

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