Check if there's any Google foobar challenge invite in the page comments

foobar-challenge.js

// Check if there's any Google foobar challenge invite in the page comments
// https://www.geeksforgeeks.org/google-foo-bar-challenge/

(() => {
	function getAllComments() {
		const $root = document.documentElement;
		const comments = [];
		const iterator = document.createNodeIterator($root, NodeFilter.SHOW_COMMENT, () => NodeFilter.FILTER_ACCEPT, false);
		let node;
		while (node = iterator.nextNode()) {
		    comments.push(node.nodeValue);
		}
		return comments;
	}
	
	function findFoobarComments() {
		if (isFound) {
			return;
		}
		const targets = ['you are speaking our language', 'up for a challenge', 'google.com/foobar', 'foobar.withgoogle.com'];
		const comments = getAllComments().map(comment => comment.toLowerCase());
		const hasTargetComment = comments.some(comment => targets.some(target => comment.includes(target)));
		
		if (hasTargetComment) {
			clearInterval(interval);
			isFound = true;
			console.log('Found foobar challenge!');
			console.log(comments);
			alert('Found foobar challenge! -> ' + comments.join`|`)
		}
	}
  
	let isFound = false;
	findFoobarComments();
	let interval = setInterval(findFoobarComments, 2000);
})();