Picking up Ruby, as a Python Dev & a mini fish app
Vicki Langer
Posted on November 19, 2020
This is a continuation of Picking up Ruby Fast, as a Python Dev. Again, expect examples with no math and minimal crappy names
Sending Messages to Multiple Methods?
I'm not sure if this is a thing you can do in Python, but you can do it in Ruby. In the example below feed "dogs" if meal_time?(5) runs 2 methods at once.
This ? in mealt_time? is also new to me and I have not seen it in Python. In Python, I would've done my variable like is_it_meal_time.
#ruby
def meal_time? time_hrs
if time_hrs >=5
puts "cat is singing song of his people, guess it's food time"
true
else
puts "tell cat to try again in an hour"
false
end
end
def feed pet
puts "put food in #{pet} bowl\n"
end
feed "cats" if meal_time?(4)
feed "dogs" if meal_time?(5)
feed "cats" if meal_time?(18)
feed "dogs" if meal_time?(18)
Classes
Classes look a little different from Python to Ruby, but looks like it's basically the same concept. The attr_accessor and @ are new parts to me.
Mini Fish App combining the stuff I've reviewed so far
I've been meaning to build a mini app for tracking the levels of things in my fish tank, so here it is.
# ruby
class Water_Level
attr_accessor :time, :ph, :ammonia, :nitrites, :nitrates, :temp
def initialize(ph, ammonia, nitrites, nitrates, temp)
@time = Time.now
@ph = ph
@ammonia = ammonia
@nitrites = nitrites
@nitrates = nitrates
@temp = temp
end
end
Water_Level.new.time
class Levelizer
def initialize(title)
@title = title
@levels = []
end
def add_a_level(ph, ammonia, nitrites, nitrates, temp)
# The << means add to the end of the array
@levels << Level.new(ph, ammonia, nitrites, nitrates, temp)
end
def show_timeline
puts "Fishify: #{@title} has tracked #{@levels.count} Levels"
@levels.sort_by { |t|
t.time
}.reverse.each { |t|
puts "#{t.ph} #{t.ammonia} #{t.nitrites} #{t.nitrates} #{t.temp} #{t.time}"
}
end
end
myapp = Levelizer.new "Vicki's Betta Tank"
myapp.add_a_level 7.4, 0, 0, 0, 78.2
myapp.add_a_level 7.4, 0, 0, 0, 72.3
myapp.add_a_level 7.2, 0, 0, 0, 79.1
myapp.show_timeline
"""
# output
Fishify: Vicki's Betta Tank has tracked 3 Levels
7.2 0 0 0 79.1 Thu Nov 19 2020 14:04:59 GMT-0500 (Eastern Standard Time)
7.4 0 0 0 72.3 Thu Nov 19 2020 14:04:59 GMT-0500 (Eastern Standard Time)
7.4 0 0 0 78.2 Thu Nov 19 2020 14:04:59 GMT-0500 (Eastern Standard Time)
"""
Reminder to self: do not work at places that think unpaid work is acceptable.
If you missed the first post in this series, I've heard it's a good read and there's cats.
Posted on November 19, 2020
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