Errors Editing Widget Scripts (Functions Not Existing)

I was able to find/create a script that worked for what I was trying to do, I used the following code which worked:

widget.on('processresult', function(e, v) {
	var results = v.result.series[0];

	maxItems = Math.max.apply(Math, results.data.map(function(el) {
		return el.y;
	}));

	
	try {
		maxFilterItems = results.data.filter(el => el.y == maxItems);
		console.log(maxFilterItems);
		$(maxFilterItems).each(function(index, value) {
			value.color = 'Orange';
        });
		
	} catch (error) {
		console.error('error: ', error);
	};
	

});

This recolors the bar with the highest value on a Column Chart widget. I don't know why those other functions don't work, though, any comment would be great