How to do a try method in ruby

Question

I can convert an object to an integer with to_i . How can I get it to not convert if the input is not a number?

In python I would do this:

h=input("Number: ")
try:
    h=int(h)
except ValueError:
    print("Please enter numbers!")

So I tried this in ruby:

print "Number: "
h=gets.chomp
try(h.to_i)
    print(h)
end

but it prints the input even if I enter letters, so this means I am doing it wrong. What is the correct Ruby way of doing this?

Answer 1

Reading ruby docs for to_i

Returns the result of interpreting leading characters in str as an integer base base (between 2 and 36). Extraneous characters past the end of a valid number are ignored. If there is not a valid number at the start of str, 0 is returned. This method never raises an exception when base is valid.

What you want in your case (to map the Python behavior) is:

begin
    Integer(gets)
rescue ArgumentError
    puts "Please enter numbers!"
end