hidden-classes.js

function distanceBetweenPoints(p1, p2) {
	return Math.hypot(p1.x - p2.x, p1.y - p2.y);
}

function closestPoints(points) {
	let closestPoints = [];
	let smallestDistance = Infinity;

	for (let i = 1; i < points.length; i++) {
		for (let j = 0; j < i; j++) {
			const distance = distanceBetweenPoints(points[i], points[j]);
			if (distance < smallestDistance) {
				smallestDistance = distance;
				closestPoints[0] = points[i];
				closestPoints[1] = points[j];
			}
		}
	}

	return closestPoints;
}

const points = [];

const POINTS_COUNT = 1000;
const FLIPPED_POINTS_COUNT = 500;

for (let v = 0; v < POINTS_COUNT; v++) {
	const x = Math.random();
	const y = Math.random();
	if (v < FLIPPED_POINTS_COUNT) {
		points.push({ x, y });
	} else {
		points.push({ y, x });
	}
}

console.time('closestPoints()');
closestPoints(points);
console.timeEnd('closestPoints()');