Sum of Multiples of 3, 5, and 7

In this lab, you will be working on a function sumOfMultiples which takes a positive integer n and returns the sum of all integers in the range [1, n] inclusive that are divisible by 3, 5, or 7.

You have to ensure your solution follows ESM import/export and is free of bugs. The function and any additional code needed for testing must be exported.

Examples

Example 1:

sumOfMultiples(7); // output: 21

In the range [1, 7], the numbers divisible by 3, 5, or 7 are 3, 5, 6, 7. The sum of these numbers is 21.

Example 2:

sumOfMultiples(10); // output: 40

In the range [1, 10], the numbers divisible by 3, 5, or 7 are 3, 5, 6, 7, 9, 10. The sum of these numbers is 40.

Example 3:

sumOfMultiples(9); // output: 30

In the range [1, 9], the numbers divisible by 3, 5, or 7 are 3, 5, 6, 7, 9. The sum of these numbers is 30.

Constraints

• 1 <= n <= 103

Challenges

1. Export the sumOfMultiples function.
2. Implement the sumOfMultiples function.

Here is the evaluation script you need to complete and include in the final solution:

1import fs from 'fs'
2
3// testlog is a log of test results
4const testlog = []
5
6// this first block matches with - Challenge 1
7try {
8	const sumOfMultiples = await import('/home/damner/code/index.js').then(t => t.sumOfMultiples)
9
10	// perform some testing
11	if(typeof sumOfMultiples === 'function') {
12		testlog.push({ status: 'pass' })
13	} else {
14		throw new Error('sumOfMultiples is not exported as a function')
15	}
16} catch(error) {
17	testlog.push({
18		status: 'error',
19		error: error.message || 'Challenge failed'
20	})
21}
22
23// this second block matches with - Challenge 2
24try {
25	const sumOfMultiples = await import('/home/damner/code/index.js').then(t => t.sumOfMultiples)
26
27	// perform some testing
28	const testCases = [
29		{ input: 7, output: 21 },
30		{ input: 10, output: 40 },
31		{ input: 9, output: 30 }
32	]
33
34	testCases.forEach(test => {
35		if(sumOfMultiples(test.input) === test.output) {
36			testlog.push({ status: 'pass' })
37		} else {
38			throw new Error(`Expected ${test.output} but got ${sumOfMultiples(test.input)}`)
39		}
40	})
41} catch(error) {
42	testlog.push({
43		status: 'error',
44		error: error.message || 'Challenge failed'
45	})
46}
47
48// very important for the final length of `testlog` array to match the number of challenges, in this case - 2.
49
50// write the test log
51fs.writeFileSync('/home/damner/code/.labtests/testlog.json', JSON.stringify(testlog))
52
53// write the results array boolean. this will map to passed or failed challenges depending on the boolean value at the challenge index
54fs.writeFileSync(process.env.UNIT_TEST_OUTPUT_FILE, JSON.stringify(testlog.map(result => result.status === 'pass')))

Make sure to keep all rules in mind while completing the lab, including the length of the testlog array, order of try-catch blocks, and other mentioned points.