'use strict';

/**

* Collection of utility methods.

*/

class TestUtils {

/**

* Generates the cartesian product of the sets.

*

* @param {...(Array|Object)} sets - variable number of sets of n elements.

* @return {Generator} yields each product as an array

*/

static* cartesianProduct(...sets) {

const data = [];

function* cartesianUtil(index) {

if (index === sets.length) {

return yield data.slice();

}

if (!Array.isArray(sets[index])) {

data[index] = sets[index];

yield* cartesianUtil(index + 1);

} else {

for (let i = 0; i < sets[index].length; i += 1) {

data[index] = sets[index][i];

yield* cartesianUtil(index + 1);

}

}

}

yield* cartesianUtil(0);

}

}

exports.TestUtils = TestUtils;