aureooms-js-array/lib/map/group.js

array manipulation code bricks for JavaScript

"use strict";

Object.defineProperty(exports, "__esModule", {
	value: true
});
exports.group = group;
function group(key, iterable, out) {

	var i, len, curr, next, tuple, item, items;

	len = iterable.length;

	if (len === 0) {
		return out;
	}

	i = 0;
	item = iterable[i];
	next = key(item);

	do {
		curr = next;
		items = [item];
		tuple = [curr, items];

		++i;

		while (i < len) {

			item = iterable[i];
			next = key(item);

			if (next !== curr) {
				break;
			}

			items.push(item);
			++i;
		}

		out.push(tuple);
	} while (i < len);

	return out;
}
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