Completed tasks

.babelrc

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+{
+    "presets": ["@babel/preset-env", "@babel/preset-react"]
+}

codewars/Adding Big Numbers/add.js

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+function add(a, b) {
+    let result = [];
+    let carry = 0;
+    let maxLength = Math.max(a.length, b.length);
+    for (let i = 0; i < maxLength; i++) {
+        let digitA = parseInt(a[a.length - i - 1], 10) || 0;
+        let digitB = parseInt(b[b.length - i - 1], 10) || 0;
+        let summ = digitA + digitB + carry;
+        carry = Math.floor(summ / 10);
+        result.push((summ % 10).toString());
+    } 
+
+    if (carry > 0) {
+        result.push(carry.toString());
+    }
+    return result.reverse().join('');
+}

codewars/Anagram difference/anagramdifference.js

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+function countChars(word) {
+    const count = {};
+    for (const char of word) {
+        count[char] = (count[char] || 0) + 1;
+    }
+    return count;
+}
+
+function anagramDifference(word1, word2) {
+    const count1 = countChars(word1);
+    const count2 = countChars(word2);
+    let totalRemovals = 0;
+    const allChars = new Set([...Object.keys(count1), ...Object.keys(count2)]);
+
+    for (const char of allChars) {
+        const freq1 = count1[char] || 0;
+        const freq2 = count2[char] || 0;
+        totalRemovals += Math.abs(freq1 - freq2);
+    }
+
+    return totalRemovals;
+}

codewars/Array Deep Count/anagramdifference.js

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+function countChars(word) {
+    const count = {};
+    for (const char of word) {
+        count[char] = (count[char] || 0) + 1;
+    }
+    return count;
+}
+
+function anagramDifference(word1, word2) {
+    const count1 = countChars(word1);
+    const count2 = countChars(word2);
+    let totalRemovals = 0;
+    const allChars = new Set([...Object.keys(count1), ...Object.keys(count2)]);
+
+    for (const char of allChars) {
+        const freq1 = count1[char] || 0;
+        const freq2 = count2[char] || 0;
+        totalRemovals += Math.abs(freq1 - freq2);
+    }
+
+    return totalRemovals;
+}

codewars/Array Deep Count/countelement.js

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+function countElements(arr) {
+    let count = 0; 
+
+    for (let element of arr) { 
+        count++; 
+        if (Array.isArray(element)) { 
+            count += countElements(element); 
+        }
+    }
+
+    return count; 
+}

codewars/Build Tower/buildTower.go

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+package main
+
+import "strings"
+
+func buildTower(numberOfFloors int) []string {
+	tower := make([]string, numberOfFloors)
+	for i := 1; i <= numberOfFloors; i++ {
+		floor := strings.Repeat(" ", numberOfFloors-i) + strings.Repeat("*", 2*i-1) + strings.Repeat(" ", numberOfFloors-1)
+		tower[i-1] = floor
+	}
+	return tower
+}

codewars/Convert string to camel case/camelCase.go

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+package main
+
+import "strings"
+
+func camelCase(s string) string {
+	words := strings.Split(strings.Replace(s, "-", "_", -1), "_")
+	var result string
+	for i, word := range words {
+		if i == 0 {
+			result += word
+		} else {
+			result += strings.Title(word)
+		}
+	}
+	return result
+}

codewars/Duplicate Encoder/duplicateEncoder.go

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+package main
+
+import "strings"
+
+func duplicateEncoder(word string) string {
+	word = strings.ToLower(word)
+	counts := make(map[rune]int)
+	for _, char := range word {
+		counts[char]++
+	}
+	var result strings.Builder
+	for _, char := range word {
+		if counts[char] == 1 {
+			result.WriteString("(")
+		} else {
+			result.WriteString(")")
+		}
+	}
+	return result.String()
+}

codewars/Find the missing letter/findTheMissingLetter.go

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+package main
+
+func findMissingLetter(chars []rune) rune {
+	for i := 0; i < len(chars)-1; i++ {
+		if chars[i+1] != chars[i]+1 {
+			return chars[i] + 1
+		}
+	}
+	return 0
+}

codewars/Flatten a Nested Map/flattenMap.js

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+function flattenMap(map, prefix = '') {
+    const result = {};
+
+    for (const key in map) {
+      if (map.hasOwnProperty(key)) {
+        const value = map[key];
+        const newKey = prefix ? `${prefix}/${key}` : key;
+
+        if (typeof value === 'object' && value !== null && !Array.isArray(value)) {
+          const nested = flattenMap(value, newKey);
+          Object.assign(result, nested);
+        } else {
+          result[newKey] = value;
+        }
+      }
+    }
+
+    return result;
+  }

codewars/Fun with tree - max sum/funWithTreeMaxSum.js

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+function maxSum(root) {
+    if (!root) return 0;
+
+    if(!root.left && !root.right) return root.value;
+
+    let leftMax = -Infinity;
+    let rightMax = -Infinity;
+
+    if (root.left) leftMax = maxSum(root.left);
+    if (root.right) rightMax = maxSum(root.right);
+
+    return root.value + Math.max(leftMax, rightMax);
+}

codewars/Linked Lists - Sorted Insert/sortedInsert.js

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+function Node(data) {
+    this.data = data;
+    this.next = null;
+  }
+
+  function sortedInsert(head, data) {
+    let newNode = new Node(data);
+
+    if (!head || data < head.data) {
+      newNode.next = head;
+      return newNode;
+    }
+
+    let current = head;
+    while (current.next && current.next.data < data) {
+      current = current.next;
+    }
+
+    newNode.next = current.next;
+    current.next = newNode;
+
+    return head;
+  }

codewars/Moving Zeros To The End/movingZeros.go

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+package main
+
+func movingZeros(array []int) []int {
+	nonZero := 0
+	for i := 0; i < len(array); i++ {
+		if array[i] != 0 {
+			array[nonZero], array[i] = array[i], array[nonZero]
+			nonZero++
+		}
+	}
+	return array
+}

codewars/Sum of Digits - Digital Root/digitalRoot.go

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+package main
+
+func digitalRoot(number int) int {
+	for number >= 10 {
+		summ := 0
+		for number != 0 {
+			summ += number % 10
+			number /= 10
+		}
+		number = summ
+	}
+	return number
+}

codewars/Tic-Tac-Toe Checker/main.go

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+package main
+
+import "fmt"
+
+func isSolved(board [3][3]int) int {
+	for i := 0; i < 3; i++ {
+		if board[i][0] == board[i][1] && board[i][1] == board[i][2] && board[i][0] != 0 {
+			return board[i][0]
+		}
+		if board[0][i] == board[1][i] && board[1][i] == board[2][i] && board[i][0] != 0 {
+			return board[0][i]
+		}
+	}
+
+	if board[0][0] == board[1][1] && board[1][1] == board[2][2] && board[0][0] != 0 {
+		return board[0][0]
+	}
+
+	if board[0][2] == board[1][1] && board[1][1] == board[2][0] && board[0][2] != 0 {
+		return board[0][2]
+	}
+
+	for i := 0; i < 3; i++ {
+		for j := 0; j < 3; j++ {
+			if board[i][j] == 0 {
+				return -1
+			}
+		}
+	}
+	return 0
+}
+
+func main() {
+	board := [3][3]int{{0, 2, 1}, {2, 0, 1}, {0, 2, 1}}
+	fmt.Println(isSolved(board))
+
+}

jest.config.js

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+module.exports = {
+    preset: 'ts-jest',
+    testEnvironment: 'node',
+    transform: {
+      '^.+\\.tsx?$': 'ts-jest',
+      '^.+\\.jsx?$': 'babel-jest',
+    },
+    moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx', 'json', 'node'],
+    testMatch: ['**/?(*.)+(spec|test).[tj]s?(x)'],
+    setupFilesAfterEnv: ['<rootDir>/setupTests.ts'],
+  };

jest.config.ts

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+import type { Config } from '@jest/types';
+
+const config: Config.InitialOptions = {
+  preset: 'ts-jest',
+  testEnvironment: 'node',
+  transform: {
+    '^.+\\.tsx?$': 'ts-jest',
+    '^.+\\.jsx?$': 'babel-jest',
+  },
+  moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx', 'json', 'node'],
+  testMatch: ['**/?(*.)+(spec|test).[tj]s?(x)'],
+  setupFilesAfterEnv: ['<rootDir>/setupTests.ts'],
+};
+
+export default config;