conditional statements to only accept integer as an input Ruby - ruby

Question

I wrote a code where it asks multiple individuals questions, and every individuals' response is put into a hash. This is in a loop and looks something like this
arr:[]
(1..n).each do |i|
hash=Hash.new()
puts "Please input a value for day # #{i}"
hash["day1"]=gets.chomp.to_f
puts "Please input a value for day # #{i}"
hash["day2"]=gets.chomp.to_f
arr << hash
end
So to avoid any incorrect input (i.e. entering string instead of an integer/number), I need to place a conditional statement.
I am super lost with how I would do that though since I am assigning the users' input into a hash at the same time I take their input.
Is it even possible to do that or should I take a different route completely.
thanks

Answer 1

You can get day values like below. When a character other than a number is entered, it asks the value of that day again.
puts 'Enter number of days'
days_hash = {}
number_of_days = gets.chomp.to_i
day = 1
while day <= number_of_days
puts "Please enter a value for day # #{day}"
input = gets.chomp
if input !~ /\D/
days_hash["day#{day}"] = input.to_i
day += 1
else
puts "Please enter only number"
next
end
end
p days_hash
#=> { "day1" => 2, "day2" => 4, "day3" => 8 }
days_hash['day2']
#=> 4

Answer 2

Maybe you can consider this general approach for validating user input, note that this example require 'date'.
So, you can check user input to be an integer or a float or a formatted date or anything you could add...
First define an array of questions containing the question text, validation method and way to convert the input, like this:
questions = [
{text: "Enter an integer:", validate: :must_be_an_integer, convert: :my_to_i},
{text: "Enter a float:", validate: :must_be_a_float, convert: :my_to_f},
{text: "Enter a data as d-m-yyyy", validate: :must_be_a_formatted_date, convert: :to_formatted_date}
]
Then define some methods to be called by :validate key, for user input validation:
def must_be_an_integer(num)
Integer(num).class == Integer rescue false
end
def must_be_a_float(num)
Float(num).class == Float && num.include?('.') rescue false
end
def must_be_a_formatted_date(date_str)
date = Date.strptime(date_str, "%d-%m-%Y") rescue false
return false unless date
date.year <= 9999 && date.year >= 1000
end
Define also the methods required by the key :convert (need to pass an argument, that's why my_to_i and my_to_f):
def my_to_i(num)
num.to_i
end
def my_to_f(num)
num.to_f
end
def to_formatted_date(date_str)
DateTime.strptime(date_str, "%d-%m-%y")
end
Finally iterate over the questions:
res = questions.map do |question|
answer = nil
3.times do
puts question[:text]
u_input = gets.chomp
if send question[:validate], u_input
answer = send question[:convert], u_input
break
end
end
if answer.nil?
puts "C'mon man! Check your keyboard!" # after three input errors!!
break
end
{ question: question[:text], answer: answer }
end
Example of a result:
#=> [
{:question=>"Enter an integer:", :answer=>1},
{:question=>"Enter a float:", :answer=>1.1},
{:question=>"Enter a data as d-m-Y", :answer=>#<DateTime: 2020-10-27T00:00:00+00:00 ((2459150j,0s,0n),+0s,2299161j)>}
]