async function main() {
    const args = [ 10, 20 ];
    const result = await execAsync((a, b) => {
        return a + b;
    }, args);
    console.log(result); // 30
}

// import function execAsync(func, args)

function testCase() {
	let total = 0;
	for(let i = 0; i < 99999999; ++i) {
		total += Math.random() * 2;
    }
	return total;
}

async function test1() {
	console.time('single thread');
	testCase();
	testCase();
	testCase();
	console.timeEnd('single thread');
}

async function test2() {
	console.time('multi thread');
	await Promise.all([
		execAsync(testCase, []),
		execAsync(testCase, []),
		execAsync(testCase, [])
	]);
	console.timeEnd('multi thread');
}