reductio/src/avg.js

Reductio: Crossfilter groupings

var avg = {
	add: function (a, prior, path) {
		return function (p, v, nf) {
			if(prior) prior(p, v, nf);
			if(path(p).count > 0) {
				path(p).avg = path(p).sum / path(p).count;
			} else {
				path(p).avg = 0;
			}
			return p;
		};
	},
	remove: function (a, prior, path) {
		return function (p, v, nf) {
			if(prior) prior(p, v, nf);
			if(path(p).count > 0) {
				path(p).avg = path(p).sum / path(p).count;
			} else {
				path(p).avg = 0;
			}
			return p;
		};
	},
	initial: function (prior, path) {
		return function (p) {
			p = prior(p);
			path(p).avg = 0;
			return p;
		};
	}
};

export default avg;