assembly-line

Assembly Line

Welcome to Assembly Line on Exercism's Ruby Track. If you need help running the tests or submitting your code, check out HELP.md. If you get stuck on the exercise, check out HINTS.md, but try and solve it without using those first :)

Introduction

Numbers

The two most common types of numbers in Ruby are:

• Integers: numbers with no digits behind the decimal separator (whole numbers). Examples are -6, 0, 1, 25, 976 and 500000.
• Floating-point numbers: numbers with zero or more digits behind the decimal separator. Examples are -2.4, 0.1, 3.14, 16.984025 and 1024.0.

They are implemented through the Integer and Float classes.

These classes have methods that will coerce values from one to the other. Integer numbers are precise to a whole unit, while Float has precision that is fractional to a whole number:

• Integer#to_f: Coerce to a new float
• Float#ceil: Round up to the nearest integer
• Float#floor: Round down to the nearest integer
• Float#round: Round to the nearest integer
• Float#to_i: Truncate to the nearest integer

Conditionals

In this exercise you must conditionally execute logic. A common way to do this in Ruby is by using an if/else statement:

x = 5

if x == 5
  # Execute logic if x equals 5
elsif x > 7
  # Execute logic if x greater than 7
else
  # Execute logic in all other cases
end

Instructions

In this exercise you'll be writing code to analyze the production of an assembly line in a car factory. The assembly line's speed can range from 0 (off) to 10 (maximum).

At its slowest speed (1), 221 cars are produced each hour. The production increases linearly with the speed. So with the speed set to 4, it should produce 4 * 221 = 884 cars per hour. However, higher speeds increase the likelihood that faulty cars are produced, which then have to be discarded. The following table shows how speed influences the success rate:

• 1 to 4: 100% success rate.
• 5 to 8: 90% success rate.
• 9: 80% success rate.
• 10: 77% success rate.

You have two tasks.

1. Calculate the production rate per hour

Implement the AssemblyLine#production_rate_per_hour method to calculate the assembly line's production rate per hour, taking into account its success rate. Note that the value returned is an instance of Float.

AssemblyLine.new(6).production_rate_per_hour
#=> 1193.4

2. Calculate the number of working items produced per minute

Implement the AssemblyLine#working_items_per_minute method to calculate how many completed, working cars are produced per minute. Note that the value returned is an instance of Integer.

AssemblyLine.new(6).working_items_per_minute
#=> 19

Source

Created by

• @dvik1950

Contributed to by

• @kotp
• @iHiD