JavaScript for Complete Beginners

A teacher has a list of test scores for each student, and every score is a number from 0 to 100. They want a small program that works out each student's average, gives it a letter grade and prints a one-line report. In this project you will build that program in gradebook.js. You will write five small functions. Each one uses something from the course: variables, if / else if / else, for loops over arrays, and functions that return a value. - average(scores): the mean of the scores. An empty list has an average of 0. - letterGrade(score): 90 and above is "A", 80 and above is "B", 70 and above is "C", 60 and above is "D", and anything lower is "F". - countPassing(scores): how many scores are 60 or more. - highest(scores): the biggest score in the list. An empty list gives 0. - report(name, scores): a line like "Ada: average 80, grade B". Work on one function at a time and run the tests after each one. If a result looks strange, console.log it, and log its typeof too.

1. Write average: start a running total at 0, loop over the scores and add each one, then divide by the number of scores. Handle the empty list first.
2. Write letterGrade with an if / else if / else chain. Check the highest grade first, and make sure a score of exactly 90, 80, 70 or 60 gets the better grade.
3. Write countPassing: keep a counter, loop over the scores, and add one to the counter whenever a score is 60 or more.
4. Write highest: return 0 for an empty list. Otherwise, start with the first score as the best so far, loop over the rest, and replace it whenever you find a bigger one.
5. Write report by calling your average and letterGrade functions and joining the results into one string with +.
6. Run all the tests. When one fails, read its hint and use console.log to check what your function really returns.