integer-cartesian.js
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integer-cartesian.js
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	"use strict";
	const clone = require("clone");

	const IntegerCartesian = {
	// integer-only
	next: function(sources, element) {
	for (const i in sources) {
	if (sources[i] <= 0) {
	return null;
	}
	}
	const new_element = clone(element);
	if (element === null) {
	return sources.map(() => 0);
	} else {
	let i = element.length - 1;
	while (i >= 0) {
	if (element[i] >= sources[i]) {
	throw new Error(
	`Invalid element. Max value on index '${i.toString()}' is '${(
	sources[i] - 1
	).toString()}'`
	);
	}
	if (element[i] === sources[i] - 1) {
	new_element[i] = 0;
	} else {
	break;
	}
	i--;
	}
	if (i === -1) {
	return null;
	}
	new_element[i] = new_element[i] + 1;
	return new_element;
	}
	},
	};

	module.exports = IntegerCartesian;

	/*
	//simple tests
	console.log(Cartesian.next([3, 2], null)); // [0,0]
	console.log(Cartesian.next([3, 2], [0,0]));
	console.log(Cartesian.next([3, 2], [0,1]));
	console.log(Cartesian.next([3, 2], [1,0]));
	console.log(Cartesian.next([3, 2], [1,1]));
	console.log(Cartesian.next([3, 2], [2,0]));
	console.log(Cartesian.next([3, 2], [2, 1])); //null
	*/