		const fetch = require('node-fetch');

		const API_URL = 'https://nmbr.dev';
		const OPERATORS = {
		'+': 'add',
		'-': 'subtract',
		'*': 'multiply',
		'/': 'divide',
		'%': 'remainder',
		'**': 'exponentiation'
		};

		const createCallPromise = (operator, a, b) => {
		return new Promise((resolve, reject) => {
		fetch(`https://nmbr.dev/${operator}/${a}/${b}`)
		fetch(`${API_URL}/${operator}/${a}/${b}`)
		.then(res => res.json())
		@@ -10,3 +20,4 @@ .then(({ result, error }) => {
		resolve(result);
		});
		})
		.catch(err => reject(err));
		});
		@@ -16,21 +27,8 @@ };
		module.exports = Nmbr => {
		Nmbr.prototype[Symbol.for('+')] = function(b) {
		const a = this.valueOf();
		return createCallPromise('add', a, b);
		};

		Nmbr.prototype[Symbol.for('-')] = function(b) {
		const a = this.valueOf();
		return createCallPromise('subtract', a, b);
		};

		Nmbr.prototype[Symbol.for('*')] = function(b) {
		const a = this.valueOf();
		return createCallPromise('multiply', a, b);
		};

		Nmbr.prototype[Symbol.for('/')] = function(b) {
		const a = this.valueOf();
		return createCallPromise('divide', a, b);
		};
		for (const [key, value] of Object.entries(OPERATORS)) {
		Nmbr.prototype[Symbol.for(key)] = function(b) {
		const a = this.valueOf();
		return createCallPromise(value, a, b);
		};
		}
		};

src/test.js

		require('./')(Number);

		(async () => {
		console.log('2 + 1 =');
		console.time('async addition');
		console.log(await (2 + 1));
		console.timeEnd('async addition');
		const TESTS = [
		{ op: '+', a: 2, b: 1, exp: 3 },
		{ op: '-', a: 2, b: 2, exp: 0 },
		{ op: '*', a: 2, b: 2, exp: 4 },
		{ op: '/', a: 4, b: 2, exp: 2 },
		{ op: '**', a: 2, b: 2, exp: 4 },
		{ op: '%', a: 5, b: 2, exp: 1 }
		];

		console.log('\n');
		const OPERATORS = {
		'+': async (a, b) => await (a + b),
		'-': async (a, b) => await (a - b),
		'': async (a, b) => await (a b),
		'/': async (a, b) => await (a / b),
		'': async (a, b) => await (a b),
		'%': async (a, b) => await (a % b)
		};

		console.log('2 - 2 =');
		console.time('async substraction');
		console.log(await (2 - 2));
		console.timeEnd('async substraction');
		(async () => {
		let errors = [];

		console.log('\n');
		for (const test of TESTS) {
		const { op, a, b, exp } = test;
		const timeKey = `async ${op}`;
		console.log(`${a} ${op} ${b} =`);
		console.time(timeKey);
		const res = await OPERATORS[op](a, b);
		console.timeEnd(timeKey);
		if (res === exp) {
		console.log(`Success! Result of operator '${op}' matched expected value '${exp}'`);
		} else {
		console.error(`Error! Result '${res}' of operator '${op}' did not match expected value '${exp}'`);
		errors.push(op);
		}
		}

		console.log('2 * 2 =');
		console.time('async multiplication');
		console.log(await (2 * 2));
		console.timeEnd('async multiplication');

		console.log('\n');

		console.log('4 / 2 =');
		console.time('async division');
		console.log(await (4 / 2));
		console.timeEnd('async division');

		console.log('\n');

		console.time('async Pi multiplication');
		console.log(await (Math.PI / 3));
		console.timeEnd('async Pi multiplication');
		if (errors.length === 0) {
		process.exit(0);
		} else {
		console.log(`Errored operators: ${JSON.stringify(errors)}`);
		process.exit(1);
		}
		})();

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