array-cartesian.js
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array-cartesian.js
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	"use strict";
	const IntegerCartesian = require("./integer-cartesian.js");

	const ArrayCartesian = function(sources) {
	const int_sources = sources.map(list => list.length);
	let current_int_state = null;

	return {
	next: function() {
	const int_next_element = IntegerCartesian.next(
	int_sources,
	current_int_state
	);
	current_int_state = int_next_element;
	if (int_next_element === null) return null;
	return int_next_element.map((index, source_number) => {
	return sources[source_number][index];
	});
	},
	};
	};

	module.exports = ArrayCartesian;