18.6. Studio: Classes¶
18.6.1. Getting Started¶
Let's create a class to handle new animal crew candidates!
Edit the practice file as you complete the studio activity.
18.6.2. Part 1 - Add Class Properties¶
Declare a class called
constructorthat takes three parameters---
scores. Note that
scoreswill be an array of test results.
Create objects for the following candidates:
Bubba Bear has a mass of 135 kg and test scores of 88, 85, and 90.
Merry Maltese has a mass of 1.5 kg and test scores of 93, 88, and 97.
Glad Gator has a mass of 225 kg and test scores of 75, 78, and 62.
console.log for each object to verify that your class correctly assigns
the key/value pairs.
18.6.3. Part 2 - Add First Class Method¶
As our candidates complete more tests, we need to be able to add the new scores to their records.
CrewCandidate. The function must take a new score as a parameter. Code this function OUTSIDE of
constructor. (If you need to review the syntax, revisit Assigning Class Methods).
When passed a score, the function adds the value to
this.scoreswith the push array method.
Test out your new method by adding a score of
83to Bubba's record, then print out the new score array with
18.6.4. Part 3 - Add More Methods¶
Now that we can add scores to our candidates' records, we need to be able to
evaluate their fitness for our astronaut program. Let's add two more methods
CrewCandidate---one to average the test scores and the other to
indicate if the candidate should be admitted.
184.108.40.206. Calculating the Test Average¶
constructor. The function does NOT need a parameter.
To find the average, add up the entries from
this.scores, then divide the sum by the number of scores.
To make the average easier to look at, round it to 1 decimal place, then return the result from the function.
Verify your code by evaluating and printing Merry's average test score (92.7).
220.127.116.11. Determining Candidate Status¶
Candidates with averages at or above 90% are automatically accepted to our training program. Reserve candidates average between 80 - 89%, while probationary candidates average between 70 - 79%. Averages below 70% lead to a rejection notice.
CrewCandidate. The method returns a string (
Rejected) depending on a candidate's average.
statusmethod requires the average test score, which can be called as a parameter OR from inside the function. That's correct - methods can call other methods inside a class! Just remember to use the
statushas a candidate's average score, evaluate that score, and return the appropriate string.
statusmethod on each of the three candidates. Use a template literal to print out
'___ earned an average test score of ___% and has a status of ___.'
18.6.5. Part 4 - Play a Bit¶
Use the three methods to boost Glad Gator's status to
Reserve or higher.
How many tests will it take to reach
Reserve status? How many to reach
Accepted? Remember, scores cannot exceed 100%.
Rather than adding one score at a time, could you use a loop?