JSFiddle - React, Tailwind, and code Playground

HTML

<div class="block">
	<div class="block-scroll">
		<div class="block__item">1</div>
		<div class="block__item">2</div>
		<div class="block__item">3</div>
		<div class="block__item">4</div>
		<div class="block__item">5</div>
		<div class="block__item">6</div>
	</div>
</div>

CSS

.block {
			width:700px;
			height:200px;
			overflow:hidden;
			background:#000000;
		}
		.block-scroll > div {
			width:300px;
			height:200px;
			margin-right:50px;
			background:#bc1b1b;
			float:left;
			position: relative;
		}
		.block-scroll{
			position: relative;
			width: 20000em;
		}

JavaScript

var Slider = {
	init: function(elem){
		this.elem = elem;
		this.blocks = $('.block__item', elem);
		this.eventHandlers();
	},
	eventHandlers: function(){
		var _this = this;
        this.elem.on('mouseenter', function(e){
			_this.onEnterAction(e);
		});
        this.elem.on('mouseleave', function(e){
			_this.onLeaveAction(e);
		});
	},
	onEnterAction: function(e){
		var _this = this;
        if(this.interval) clearInterval(this.interval);
        
		this.interval = setInterval(function(){
			console.log(_this.blocks);
			_this.blocks.each(function(index, block) {
                var left = ($(block).css('left') != 'auto')?(parseInt($(block).css('left')) - 5) + 'px':  '-5px';
                console.log($(block).css('left'));
                
				$(block).css('left', left);
			});

			if(Math.abs(parseInt(_this.blocks.eq(0).css('left'))) >= _this.blocks.eq(0).outerWidth + parseInt(_this.blocks.eq(0).css('marginRight'))){

				_this.blocks.eq(0).parent().append(_this.blocks.eq(0));
				_this.blocks = $('.block__item', _this.elem);

				_this.blocks.each(function(index, block) {

					$(block).css('left', 0);

				});
			}
		}, 50);
	},
	onLeaveAction: function(){

		clearInterval(this.interval);
	}
};

Slider.init($('.block'));

/*function bind(func, context) {
    return function() { 
        return func.apply(context, arguments);
    };
}
NodeList.prototype.forEach = Array.prototype.forEach;
HTMLCollection.prototype.forEach = Array.prototype.forEach; */