/var/runtime/node_modules/@aws-sdk/node_modules/obliterator
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/** * Obliterator Permutations Function * ================================== * * Iterator returning permutations of the given array. */var Iterator = require('./iterator.js'); /** * Helper mapping indices to items. */function indicesToItems(target, items, indices, r) { for (var i = 0; i < r; i++) target[i] = items[indices[i]];} /** * Permutations. * * @param {array} array - Target array. * @param {number} r - Size of the subsequences. * @return {Iterator} */module.exports = function permutations(array, r) { if (!Array.isArray(array)) throw new Error('obliterator/permutations: first argument should be an array.'); var n = array.length; if (arguments.length < 2) r = n; if (typeof r !== 'number') throw new Error('obliterator/permutations: second argument should be omitted or a number.'); if (r > n) throw new Error('obliterator/permutations: the size of the subsequences should not exceed the length of the array.'); var indices = new Uint32Array(n), subsequence = new Array(r), cycles = new Uint32Array(r), first = true, i; for (i = 0; i < n; i++) { indices[i] = i; if (i < r) cycles[i] = n - i; } i = r; return new Iterator(function next() { if (first) { first = false; indicesToItems(subsequence, array, indices, r); return {value: subsequence}; } var tmp, j; i--; if (i < 0) return {done: true}; cycles[i]--; if (cycles[i] === 0) { tmp = indices[i]; for (j = i; j < n - 1; j++) indices[j] = indices[j + 1]; indices[n - 1] = tmp; cycles[i] = n - i; return next(); } else { j = cycles[i]; tmp = indices[i]; indices[i] = indices[n - j]; indices[n - j] = tmp; i = r; indicesToItems(subsequence, array, indices, r); return {value: subsequence}; } });};