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This is a playground to test code. It runs a full Node.js environment and already has all of npm’s 1,000,000+ packages pre-installed, including @extra-entries/cartesian-product. Try it out:
const entries = require("extra-entries");
var x = [["a", 1], ["b", 2], ["c", 3]];
var y = [["d", 10], ["e", 20]];
[...entries.cartesianProduct([x, y])].map(x => [...x]);
[...entries.cartesianProduct([x, y], a => entries.max(a))];
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