// SARS-CoV-2-Viz
// Animated COVID case count visualization
// Copyright 2022 Edward L. Platt <ed@elplatt.com>

function ProgressTracker(onCreate, onProgress) {
    let jobProgress = [];
    let tracker = {
	getTracker: (initial='') => {
	    let id = jobProgress.length;
	    jobProgress.push(initial);
	    onCreate(id);
	    return (progress) => {
		jobProgress[id] = progress;
		onProgress(id, tracker.progress(id));
	    }
	},
	progress: (id) => jobProgress[id]
    };
    return tracker;
}