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52 lines
1.4 KiB
JavaScript
52 lines
1.4 KiB
JavaScript
(function (exports) {
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'use strict';
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/**
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* Sorts strings lexicographically.<br><br>
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* Time complexity: O(N*M) for N keys which have M or fewer digits.
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*
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* @example
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*
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* var sort = require('../src/sorting/lsd').lsd;
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* // [ 'aab', 'aaa', 'acc', 'bbb', 'bcc' ]
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* console.log(sort(['aab', 'bbb', 'aaa', 'acc', 'bcc']));
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*
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* @public
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* @module sorting/lsd
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* @param {Array} arr Array which should be sorted.
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* @param {Number} letterIdx Optional. Index to start sorting from.
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* @return {Array} Sorted array.
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*/
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function lsd(arr, letterIdx) {
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var temp;
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var count;
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letterIdx = letterIdx || 1;
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for (var i = letterIdx - 1; i >= 0; i -= 1) {
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count = [];
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temp = [];
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for (var j = 0; j < arr.length; j += 1) {
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var charCode = arr[j].charCodeAt(i);
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var old = count[charCode + 1] || 0;
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count[charCode + 1] = old + 1;
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}
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for (var c = 0; c < count.length - 1; c += 1) {
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count[c] = count[c] || 0;
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count[c + 1] = count[c + 1] || 0;
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count[c + 1] += count[c];
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}
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for (j = 0; j < arr.length; j += 1) {
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var code = arr[j].charCodeAt(i);
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temp[count[code]] = arr[j];
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count[code] += 1;
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}
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for (j = 0; j < arr.length; j += 1) {
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arr[j] = temp[j];
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}
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}
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return arr;
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}
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exports.lsd = lsd;
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})(typeof window === 'undefined' ? module.exports : window);
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