calvinf/multiply.html

## multiply.html
<!doctype html>
<html>

<head>
    <title>Multiply</title>
    <meta charset="utf-8">
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/mocha/3.4.2/mocha.css">
</head>

<body>
    <div id="mocha"></div>

    <script src="https://cdnjs.cloudflare.com/ajax/libs/chai/4.0.2/chai.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/mocha/3.4.2/mocha.min.js"></script>

    <script>
        // curried multipier that calls itself
        // until it has no more arguments passed in
        // and when its done returns the product of all multiples
        const multiply = function (...args) {
            // we keep adding multiples into this list
            let multiples = [];

            // we return this function to handle accumulating multiples
            const fn = function (...more) {
                // if there aren't anymore args, we finally
                // return the multiplied result of all the arguments
                // across all the calls
                if (!more.length) {
                    if (!multiples.length) {
                        throw new Error('no multiples provided');
                    }

                    return multiples.reduce((acc, curr) => acc * curr);
                }

                // if there are still more numbers, add to multiples
                multiples.push(...more);

                // return back this function so we can call it again
                // and keep going
                return fn;
            }

            // first time multiply is called, we call fn with
            // the initial arguments passed in to get started
            return fn(...args);
        }

        // test runner
        const { expect } = window.chai;
        mocha.setup('bdd');

        // tests
        describe('it multiplies correctly', () => {
            it('handles being called once', () => {
                expect(multiply(4, 5)()).to.equal(20);
            });

            it('handles being called twice', () => {
                expect(multiply(4, 5)(2, 3)()).to.equal(120);
            });

            it('handles being called thrice', () => {
                expect(multiply(4, 5)(2, 3)(3)()).to.equal(360);
            });

            it('handles three or more arguments', () => {
                expect(multiply(7, 8, 9)(10)()).to.equal(5040);
            })
        });

        // run tests
        mocha.run();
    </script>
</body>

</html>
	<!doctype html>
	<html>

	<head>
	<title>Multiply</title>
	<meta charset="utf-8">
	<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/mocha/3.4.2/mocha.css">
	</head>

	<body>
	<div id="mocha"></div>

	<script src="https://cdnjs.cloudflare.com/ajax/libs/chai/4.0.2/chai.min.js"></script>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/mocha/3.4.2/mocha.min.js"></script>

	<script>
	// curried multipier that calls itself
	// until it has no more arguments passed in
	// and when its done returns the product of all multiples
	const multiply = function (...args) {
	// we keep adding multiples into this list
	let multiples = [];

	// we return this function to handle accumulating multiples
	const fn = function (...more) {
	// if there aren't anymore args, we finally
	// return the multiplied result of all the arguments
	// across all the calls
	if (!more.length) {
	if (!multiples.length) {
	throw new Error('no multiples provided');
	}

	return multiples.reduce((acc, curr) => acc * curr);
	}

	// if there are still more numbers, add to multiples
	multiples.push(...more);

	// return back this function so we can call it again
	// and keep going
	return fn;
	}

	// first time multiply is called, we call fn with
	// the initial arguments passed in to get started
	return fn(...args);
	}

	// test runner
	const { expect } = window.chai;
	mocha.setup('bdd');

	// tests
	describe('it multiplies correctly', () => {
	it('handles being called once', () => {
	expect(multiply(4, 5)()).to.equal(20);
	});

	it('handles being called twice', () => {
	expect(multiply(4, 5)(2, 3)()).to.equal(120);
	});

	it('handles being called thrice', () => {
	expect(multiply(4, 5)(2, 3)(3)()).to.equal(360);
	});

	it('handles three or more arguments', () => {
	expect(multiply(7, 8, 9)(10)()).to.equal(5040);
	})
	});

	// run tests
	mocha.run();
	</script>
	</body>

	</html>