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28 lines
606 B
28 lines
606 B
/**
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* Obliterator Power Set Function
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* ===============================
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*
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* Iterator returning the power set of the given array.
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*/
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var Iterator = require('./iterator.js'),
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combinations = require('./combinations.js'),
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chain = require('./chain.js');
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/**
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* Power set.
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*
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* @param {array} array - Target array.
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* @return {Iterator}
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*/
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module.exports = function powerSet(array) {
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var n = array.length;
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var iterators = new Array(n + 1);
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iterators[0] = Iterator.of([]);
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for (var i = 1; i < n + 1; i++) iterators[i] = combinations(array, i);
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return chain.apply(null, iterators);
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};
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