quoi de ruby utilisé pour
Its mainly used for web apps but since it has similiar sntax to python you can also use it for data analysis and prototyping.
ruby pour les programmeurs
irb(main):007:0> a = 3 ** 2
=> 9
irb(main):008:0> b = 4 ** 2
=> 16
irb(main):009:0> Math.sqrt(a+b)
=> 5.0