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横に長いWebページで、右端までスクロールされたかを判定する【JavaScript】

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もしかしたら他の方が記事にしていらっしゃるかもしれませんが、自分用メモとして。
最下部スクロールなどの記事はよく見かけるのですが、右端スクロールはあまり見ないので。

var lastScrollx = 0;

$(function() {

    lastScrollx = window.pageXOffset;

	window.addEventListener('scroll', function(event) {
		var direction = 'vertical';
		var scrollValue = window.pageXOffset;

		if (lastScrollx != scrollValue) {
			if (lastScrollx > scrollValue) {
				direction = 'left';
			} else {
				direction = 'right';
				var docW = $(document).innerWidth();
				var winW = $(window).innerWidth();
				var maxScrollValue = docW - winW;
				if (scrollValue == maxScrollValue) {
					console.log('右端に到達');
				}
			}
		} else {
            direction = 'vertical';
        }
		lastScrollx = scrollValue;
	});
}

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