Calculate Distance

File.open(ARGV[0]).each_line do |line|
    # expression to pull positive or negative ints out of the input line
    # expects "(x, y) (a, b)"
    regex = /\((?<x>\-?\d+), (?<y>\-?\d+)\) \((?<a>\-?\d+), (?<b>\-?\d+)\)/
    input = regex.match(line.strip)
    
    # pull variables out of match data; cast them from string to int
    x,y,a,b = ["x","y","a","b"].map{|var| input[var].to_i}
    
    # print integer distance
    puts (((x-a)**2+(y-b)**2)**0.5).to_i
end

Calculate Distance 2

File.open(ARGV[0]).each_line do |line|
    line.
        scan(/-?\d+/).
        map{|n| n.to_i}.
        each_cons(4){|x,y,a,b|
            puts (((x-a)**2+(y-b)**2)**0.5).to_i
        }
end