How to format float64 to_s?

[ray-delossantos]

Hello:

In the next code

test = 9525365.25
puts test.to_s => 9.52537e+06

I would like to have a string with this format => "9525365.25"

[jhass]

Just use String#%:

test = 9525365.25
puts "%.2f" % test

https://carc.in/#/r/sz5

Please consider using StackOverflow for such questions, thanks!

[ray-delossantos]

Sorry for the misuse of the crystal github issues module. Thanks for your help.

[ysbaddaden]

I find the default Float#to_s to be rather annoying and I would love if it returned nice numbers when it can. Ruby does a better job here.

[asterite]

@ysbaddaden Me too. We just need to port this from C to Crystal ;-)

[asterite]

Or we could just use it and have a wrapper for it.

[ysbaddaden]

I found an alternative to Dragon4: Grisu3 by Florian Loitsch which is expected to be faster yet correct in 99.5% of cases. It's apparently used in V8 and by Mozilla, and a C library is available: https://github.com/google/double-conversion