Must be done in Javascript.

Professor X has written a JavaScript function findAverage() to help his students compute homework score averages. The findAverage() function returns the average of an array of homework scores. Professor X's students complain that sometimes findAverage() returns NaN or unexpected answers. Professor X suspects the problems are due to students passing findAverage() an empty scores array or an array with improperly formatted scores. Modify findAverage() to throw exceptions for the following reasons:

1.) No scores are in the scores array.

2.) A negative score was found in the scores array.

3.) A non-integer was found in the scores array.

Wrap the existing function calls to findAverage() in a try-catch statement, and output any thrown exceptions to the console. The program should continue to try the next call to findAverage() regardless of any exceptions thrown.

To determine if a non-integer exists in the scores array, use the ECMAScript 6 method Number.isInteger(n), which returns true if n is an integer, and false otherwise. Some browsers do not yet support Number.isInteger(n), so a polyfill is provided for the method. A polyfill is code that provides functionality a web browser is currently lacking but may support in the future.

Here is the code:

// Returns the average of the numbers in the scores array. function findAverage(scores) { var sum = 0; scores.forEach(function(score) { sum += score; }); return sum / scores.length; }

console.log("Average = " + findAverage([90, 85, 71, 93])); console.log("Average = " + findAverage([76])); console.log("Average = " + findAverage([90, -85, 71, 93])); // Should not accept negative numbers console.log("Average = " + findAverage([])); // Should not accept empty arrays console.log("Average = " + findAverage([60, "cat", 70])); // Should not accept non-numbers

// For browsers that do not support the ES6 method Number.isInteger() Number.isInteger = Number.isInteger || function(value) { return typeof value === "number" && isFinite(value) && Math.floor(value) === value; };