add radix sort

Author: dmitrymorozoff

README.md

@@ -8,6 +8,7 @@
 3. [Сортировка подсчётом / Counting Sort](https://github.com/dmitrymorozoff/algorithms-in-javascript/blob/master/source/sorts/counting-sort/counting-sort.js) | [Инфо](https://www.youtube.com/watch?v=6dk_csyWif0)
 4. [Сортировка чёт-нечет / OddEven Sort](https://github.com/dmitrymorozoff/algorithms-in-javascript/blob/master/source/sorts/odd-even-sort/odd-even-sort.js) | [Инфо](https://ru.wikipedia.org/wiki/%D0%A1%D0%BE%D1%80%D1%82%D0%B8%D1%80%D0%BE%D0%B2%D0%BA%D0%B0_%D1%87%D1%91%D1%82-%D0%BD%D0%B5%D1%87%D0%B5%D1%82)
 5. [Быстрая сортировка / Quick Sort](https://github.com/dmitrymorozoff/algorithms-in-javascript/blob/master/source/sorts/quick-sort/quick-sort.js) | [Инфо](https://habrahabr.ru/sandbox/29775/)
+6. [Поразрядная сортировка / Radix Sort](https://github.com/dmitrymorozoff/algorithms-in-javascript/blob/master/source/sorts/radix-sort/radix-sort.js) | [Инфо](http://trubetskoy1.narod.ru/alg/radixsort.html)
 
 ## Структуры данных / Data Structures
 1. [Стек / Stack](https://github.com/dmitrymorozoff/algorithms-in-javascript/blob/master/source/structures/stack.js) | [Инфо](https://ru.wikipedia.org/wiki/%D0%A1%D1%82%D0%B5%D0%BA)

index.html

@@ -14,6 +14,7 @@
     <script src="./source/sorts/selection-sort/selection-sort.js" type="module"></script>
     <script src="./source/sorts/odd-even-sort/odd-even-sort.js" type="module"></script>
     <script src="./source/sorts/quick-sort/quick-sort.js" type="module"></script>
+    <script src="./source/sorts/radix-sort/radix-sort.js" type="module"></script>
     <script src="./source/structures/stack.js" type="module"></script>
     <script src="./source/structures/queue.js" type="module"></script>
     <script src="./source/structures/singly-list.js" type="module"></script>

source/sorts/radix-sort/radix-sort.js

@@ -0,0 +1,47 @@
+import { pad } from "../../utils//helpers.js";
+
+/**
+ * Функция разделения массива
+ * @param {any} array Входящий массив
+ * @param {any} length Максимальное количество разрядов в сортируемых величинах
+ * @param {any} range Количество возможных значений одного разряда
+ * @returns 
+ */
+export default function radixSort(arr, length, range) {
+    let lists = [];
+    let numDischarge = length - 1;
+    let sortedArray = [];
+    for (let i = 0; i < arr.length; i++) {
+        if (arr[i].toString().length < length) {
+            arr[i] = pad(arr[i], length);
+        }
+    }
+    while (numDischarge >= 0) {
+        sortedArray = [];
+        for (let i = 0; i < range; i++) {
+            lists[i] = [];
+        }
+        for (let i = 0; i < arr.length; i++) {
+            let indexValue = null;
+            let arrayValues = arr[i].toString().split("");
+            indexValue = arrayValues[numDischarge];
+            lists[indexValue].push(arr[i]);
+        }
+        for (let i = 0; i < lists.length; i++) {
+            if (!!lists[i]) {
+                for (let j = 0; j < lists[i].length; j++) {
+                    sortedArray.push(lists[i][j]);
+                }
+            }
+        }
+        arr = [];
+        arr = [...sortedArray];
+        numDischarge--;
+    }
+    for (let i = 0; i < sortedArray.length; i++) {
+        if (typeof sortedArray[i] === "string") {
+            sortedArray[i] = parseInt(sortedArray[i], 10);
+        }
+    }
+    return sortedArray;
+}

source/sorts/radix-sort/radix-sort.spec.js

@@ -0,0 +1,18 @@
+import radixSort from "./radix-sort";
+
+describe("radix-sort", () => {
+    test("should return [1, 22, 44, 45, 56, 76, 123, 5525, 54446785] if sort", () => {
+        const testArray = [22, 123, 45, 44, 76, 1, 54446785, 5525, 56];
+        expect(radixSort(testArray, 8, 10)).toEqual([
+            1,
+            22,
+            44,
+            45,
+            56,
+            76,
+            123,
+            5525,
+            54446785
+        ]);
+    });
+});

source/utils/helpers.js

@@ -41,3 +41,16 @@ export function repeatString(firstString, secondString) {
     }
     return resultString;
 }
+
+/**
+ * Вставка нулей в начало строки до определенной длины
+ * @param {any} num Число
+ * @param {any} size Размер финальной строки
+ */
+export function pad(num, size) {
+    var string = num.toString();
+    while (string.length < size) {
+        string = "0" + string;
+    }
+    return string;
+}