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17 lines
559 B
17 lines
559 B
// Map values in an object
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const mapValues = (obj, fn) => Object.fromEntries(Object.entries(obj).map(([k, v]) => [k, fn(v)]));
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// Cartesian product of a list of arrays
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const product = (...arrays) => arrays.reduce((a, b) => a.flatMap(ai => b.map(bi => [...ai, bi])), [[]]);
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const unique = (...array) => array.filter((obj, i) => array.indexOf(obj) === i);
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const zip = (...args) =>
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Array(Math.max(...args.map(array => array.length)))
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.fill()
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.map((_, i) => args.map(array => array[i]));
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module.exports = {
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mapValues,
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product,
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unique,
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zip,
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};
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