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backend/node_modules/obliterator/power-set.js

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