diff --git a/.github/workflows/node.js.yml b/.github/workflows/node.js.yml new file mode 100644 index 00000000..e6bb2a07 --- /dev/null +++ b/.github/workflows/node.js.yml @@ -0,0 +1,35 @@ +# This workflow will do a clean install of node dependencies, build the source code and run tests across different versions of node +# For more information see: https://help.github.com/actions/language-and-framework-guides/using-nodejs-with-github-actions + +name: Node.js CI + +on: + push: + branches: [ main ] + paths: '**/**.js' + pull_request: + branches: [ main ] + paths: '**/**.js' +env: + PATH_PREFIX: 'algorithms/JavaScript' +jobs: + build: + + runs-on: ubuntu-latest + + strategy: + matrix: + node-version: [10.x, 12.x, 14.x, 15.x] + # See supported Node.js release schedule at https://nodejs.org/en/about/releases/ + + steps: + - uses: actions/checkout@v2 + - name: Use Node.js ${{ matrix.node-version }} + uses: actions/setup-node@v2 + with: + node-version: ${{ matrix.node-version }} + - run: | + cd ${{ env.PATH_PREFIX }} + npm ci + - run: npm run build --if-present --prefix ${{ env.PATH_PREFIX }} + - run: npm run lint --prefix ${{ env.PATH_PREFIX }} diff --git a/algorithms/JavaScript/.eslintrc.json b/algorithms/JavaScript/.eslintrc.json new file mode 100644 index 00000000..9b7faf00 --- /dev/null +++ b/algorithms/JavaScript/.eslintrc.json @@ -0,0 +1,42 @@ +{ + "env": { + "browser": true, + "commonjs": true, + "es2021": true + }, + "extends": [ + "google" + ], + "parserOptions": { + "ecmaVersion": 12 + }, + "rules": { + "linebreak-style": 0, + "global-require": 0, + "eslint linebreak-style": [ + 0, + "error", + "windows" + ], + "require-jsdoc": [ + "error", + { + "require": { + "FunctionDeclaration": false, + "MethodDefinition": false, + "ClassDeclaration": false, + "ArrowFunctionExpression": false, + "FunctionExpression": false + } + } + ], + "semi": [ + "error", + "always" + ], + "quotes": [ + "error", + "single" + ] + } +} \ No newline at end of file diff --git a/algorithms/JavaScript/.gitignore b/algorithms/JavaScript/.gitignore new file mode 100644 index 00000000..d5a06f7a --- /dev/null +++ b/algorithms/JavaScript/.gitignore @@ -0,0 +1,116 @@ +# Logs +logs +*.log +npm-debug.log* +yarn-debug.log* +yarn-error.log* +lerna-debug.log* + +# Diagnostic reports (https://nodejs.org/api/report.html) +report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json + +# Runtime data +pids +*.pid +*.seed +*.pid.lock + +# Directory for instrumented libs generated by jscoverage/JSCover +lib-cov + +# Coverage directory used by tools like istanbul +coverage +*.lcov + +# nyc test coverage +.nyc_output + +# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files) +.grunt + +# Bower dependency directory (https://bower.io/) +bower_components + +# node-waf configuration +.lock-wscript + +# Compiled binary addons (https://nodejs.org/api/addons.html) +build/Release + +# Dependency directories +node_modules/ +jspm_packages/ + +# Snowpack dependency directory (https://snowpack.dev/) +web_modules/ + +# TypeScript cache +*.tsbuildinfo + +# Optional npm cache directory +.npm + +# Optional eslint cache +.eslintcache + +# Microbundle cache +.rpt2_cache/ +.rts2_cache_cjs/ +.rts2_cache_es/ +.rts2_cache_umd/ + +# Optional REPL history +.node_repl_history + +# Output of 'npm pack' +*.tgz + +# Yarn Integrity file +.yarn-integrity + +# dotenv environment variables file +.env +.env.test + +# parcel-bundler cache (https://parceljs.org/) +.cache +.parcel-cache + +# Next.js build output +.next +out + +# Nuxt.js build / generate output +.nuxt +dist + +# Gatsby files +.cache/ +# Comment in the public line in if your project uses Gatsby and not Next.js +# https://nextjs.org/blog/next-9-1#public-directory-support +# public + +# vuepress build output +.vuepress/dist + +# Serverless directories +.serverless/ + +# FuseBox cache +.fusebox/ + +# DynamoDB Local files +.dynamodb/ + +# TernJS port file +.tern-port + +# Stores VSCode versions used for testing VSCode extensions +.vscode-test + +# yarn v2 +.yarn/cache +.yarn/unplugged +.yarn/build-state.yml +.yarn/install-state.gz +.pnp.* \ No newline at end of file diff --git a/algorithms/JavaScript/.prettierrc b/algorithms/JavaScript/.prettierrc new file mode 100644 index 00000000..7674d893 --- /dev/null +++ b/algorithms/JavaScript/.prettierrc @@ -0,0 +1,6 @@ +{ + "trailingComma": "es5", + "tabWidth": 2, + "semi": true, + "singleQuote": true +} \ No newline at end of file diff --git a/algorithms/JavaScript/README.md b/algorithms/JavaScript/README.md index 6e7fc0c8..799a7306 100644 --- a/algorithms/JavaScript/README.md +++ b/algorithms/JavaScript/README.md @@ -1,21 +1,21 @@ # JavaScript ## Arrays -1. [Count Inversions](arrays/count-inversions.js) +1. [Counting Inversions](src/arrays/counting-inversions.js) ## Linked Lists -1. [Singly](linked_lists/singly.js) +1. [Singly](lsrc/inked_lists/singly.js) ## Searching -1. [Binary Search Recursive](searching/binary-search-recursive.js) -2. [Binary Search](searching/binary-search.js) -3. [Linear Search](searching/linear-search.js) +1. [Binary Search Recursive](src/searching/binary-search-recursive.js) +2. [Binary Search](src/searching/binary-search.js) +3. [Linear Search](src/searching/linear-search.js) ## Sorting -1. [Bubble Sort](sorting/bubble-sort.js) -2. [Insertion Sort](sorting/insertion-sort.js) -3. [Selection Sort](sorting/selection-sort.js) +1. [Bubble Sort](src/sorting/bubble-sort.js) +2. [Insertion Sort](src/sorting/insertion-sort.js) +3. [Selection Sort](src/sorting/selection-sort.js) ## Strings -1. [Palindrome](strings/palindrome.js) -2. [Sequence](strings/sequence.js) +1. [Palindrome](src/strings/palindrome.js) +2. [Sequence](src/strings/sequence.js) diff --git a/algorithms/JavaScript/arrays/count-inversions.js b/algorithms/JavaScript/arrays/count-inversions.js deleted file mode 100644 index 7a828f2f..00000000 --- a/algorithms/JavaScript/arrays/count-inversions.js +++ /dev/null @@ -1,48 +0,0 @@ -// Algorithm Type: Divide & Conquer -// Time Complexity: O(n*log(n)) - -function count_split_inv(arr, left, right) { - let split_inv, lidx, ridx; - split_inv = ridx = lidx = 0; - let size = arr.length; - let lsize = left.length; - let rsize = right.length; - for (let i = 0; i < size; i++) { - if (lidx != lsize && ridx != rsize) { - if (right[ridx] <= left[lidx]) { - arr[i] = right[ridx]; - ridx++; - split_inv += lsize - lidx; - } else { - arr[i] = left[lidx]; - lidx++; - } - } else if (lidx == lsize) { - arr[i] = right[ridx]; - ridx++; - } else if (ridx == rsize) { - arr[i] = left[lidx]; - lidx++; - } - } - return split_inv; -} - -function count_inversions(arr) { - let size = arr.length; - if (size == 1) { - return 0; - } - let mid = parseInt(size / 2); - let left = arr.slice(0, mid); - let right = arr.slice(mid, size); - let left_inv = count_inversions(left); - let right_inv = count_inversions(right); - let split_inv = count_split_inv(arr, left, right); - - return left_inv + right_inv + split_inv; -} - -var arr = [8, 2, 1, 5, 7, 3, 9, 2, 0, 1]; - -console.log(count_inversions(arr)); diff --git a/algorithms/JavaScript/linked-lists/singly.js b/algorithms/JavaScript/linked-lists/singly.js deleted file mode 100644 index 05825af0..00000000 --- a/algorithms/JavaScript/linked-lists/singly.js +++ /dev/null @@ -1,55 +0,0 @@ -class Node { - constructor(data) { - this.data = data; - this.next = null; - } -} - -class SinglyLinkedList { - constructor() { - this.head = null; - } - - insertAtHead(data) { - let newNode = new Node(data); - if(this.head == null) { - this.head = newNode; - } else { - newNode.next = this.head; - this.head = newNode; - } - } - - removeAtHead() { - // check for underflow - if(this.head == null) { - console.log("Underflow"); - return; - } - // store head's reference data value in local data variable - let data = this.head.data; - this.head = this.head.next; - return data; - } - - printList() { - // if head is null then list is empty - if(this.head == null) { - console.log("List is Empty"); - } else { - // iterate through list until itr is not null - let itr = this.head; - while(itr != null) { - console.log(itr.data); - itr = itr.next; - } - } - } -} - -let l = new SinglyLinkedList(); -l.insertAtHead(1); -l.insertAtHead('xyz'); -l.insertAtHead(1.1); -l.removeAtHead(); -l.printList() diff --git a/algorithms/JavaScript/package-lock.json b/algorithms/JavaScript/package-lock.json new file mode 100644 index 00000000..787c257b --- /dev/null +++ b/algorithms/JavaScript/package-lock.json @@ -0,0 +1,1024 @@ +{ + "name": "algorithms", + "version": "1.0.0", + "lockfileVersion": 1, + "requires": true, + "dependencies": { + "@babel/helper-validator-identifier": { + 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"https://github.com/MakeContributions/DSA/issues" + }, + "homepage": "https://github.com/MakeContributions/DSA#readme" +} diff --git a/algorithms/JavaScript/searching/binary-search-recursive.js b/algorithms/JavaScript/searching/binary-search-recursive.js deleted file mode 100644 index 1c5bba30..00000000 --- a/algorithms/JavaScript/searching/binary-search-recursive.js +++ /dev/null @@ -1,52 +0,0 @@ -//Recursive Method - -/*Arguments to Function - -arr - array ( Sorted Only ) -low - lower index of array (0) -high - max index of array (length of array - 1 ) -item = Element to be searched . - -*/ - -function binary_recurrence(arr, low, high, item) { - // Base Case for the termination of Recursion - - if(low > high) { - return -1 ; //Item is not present in the Array - } - - // Calculating Mid Index - let mid = Math.floor((low+high)/2) ; - - //Equation Middle Element with the item to be searched - - if(arr[mid] == item ){ - - // Middle Element equal to the Item - // We found Element at the mid Index - return mid ; - - } - else if( arr[mid] > item ){ - - // Item is less than the middle Element - // Ignore the Right Half , as right half contains elements greater than middle element and so item too . - // Make a recursive call to the left Half - - return binary_recurrence(arr,low,mid-1,item); - } - else { - //Item is greater than the middle Element - //Ignore the Left Half ,as left half contains element less than middle element and so item too . - //Make recursive call to the right Half - - return binary_recurrence(arr,mid+1,high,item); - - } - -} - -console.log(binary_recurrence([1,3,5,7,8,9], 0, 5, 7)); //returns 3 , Found at Index 3 - -console.log(binary_recurrence([1,3,5,7,8,9], 0, 5, 10)); //returns -1 , 10 is not present in array diff --git a/algorithms/JavaScript/searching/binary-search.js b/algorithms/JavaScript/searching/binary-search.js deleted file mode 100644 index 0f16dada..00000000 --- a/algorithms/JavaScript/searching/binary-search.js +++ /dev/null @@ -1,34 +0,0 @@ - - -/* In this We will learn how to search for an item in Sorted array using Binary Search .*/ - -function binarySearch( item , arr ) { - let first = 0; //left endpoint or index of first array element - let last = arr.length - 1; //right endpoint or index of lat array element . - - while (first <= last) { - let middle = Math.floor((first + last)/2); - if ( arr[middle] == item ) { - // If the element is present at the middle itself - return middle ; - - } - else if ( arr[middle] > item ) { - // Ignore Right Half i.e. items after middle element . - last = middle - 1; - } - else { - // Ignore Right Half i.e. items after middle element . - first = middle + 1; - } - } - return -1; //Item is not present in Array . -} - -console.log(binarySearch(6,[2, 6, 8])); //expected output = 1 -console.log(binarySearch(10,[2, 3, 10, 14])); //expected output = 2 -console.log(binarySearch(1,[2, 6, 8])); //expected output = -1 - - - - diff --git a/algorithms/JavaScript/sorting/insertion-sort.js b/algorithms/JavaScript/sorting/insertion-sort.js deleted file mode 100644 index 57dd52be..00000000 --- a/algorithms/JavaScript/sorting/insertion-sort.js +++ /dev/null @@ -1,16 +0,0 @@ -function insertionSort(array) { - // start with index 1 because only one element is already sorted - for(let i=1; i= 0 && array[j] > key) { - array[j+1] = array[j]; - j--; - } - array[j+1] = key; - } - return array; -} - -console.log(insertionSort([4,5,6,7,8,10,1,2,3,4])) // output : [1,2,3,4,4,5,6,7,8,10] diff --git a/algorithms/JavaScript/sorting/selection-sort.js b/algorithms/JavaScript/sorting/selection-sort.js deleted file mode 100644 index 088c4d7e..00000000 --- a/algorithms/JavaScript/sorting/selection-sort.js +++ /dev/null @@ -1,25 +0,0 @@ -function selectionSort(array) { - - // loop through all elements except last in array - for(let i=0;i high) { + return -1;// Item is not present in the Array + } + + // Calculating Mid Index + const mid = Math.floor((low + high) / 2); + + // Equation Middle Element with the item to be searched + + if (arr[mid] == item) { + // Middle Element equal to the Item + // We found Element at the mid Index + return mid; + } else if (arr[mid] > item) { + // Item is less than the middle Element + // Ignore the Right Half , as right half contains elements + // greater than middle element and so item too. + // Make a recursive call to the left Half + + return binaryRecursive(arr, low, mid - 1, item); + } else { + // Item is greater than the middle Element + // Ignore the Left Half ,as left half contains element less + // than middle element and so item too . + // Make recursive call to the right Half + + return binaryRecursive(arr, mid + 1, high, item); + } +} + +// returns 3 , Found at Index 3 +console.log(binaryRecursive([1, 3, 5, 7, 8, 9], 0, 5, 7)); + +// returns -1 , 10 is not present in array +console.log(binaryRecursive([1, 3, 5, 7, 8, 9], 0, 5, 10)); diff --git a/algorithms/JavaScript/src/searching/binary-search.js b/algorithms/JavaScript/src/searching/binary-search.js new file mode 100644 index 00000000..0cec8046 --- /dev/null +++ b/algorithms/JavaScript/src/searching/binary-search.js @@ -0,0 +1,31 @@ +/* +* In this We will learn how to search for an item in +* Sorted array using Binary Search. +*/ + +function binarySearch(item, arr) { + let first = 0; // left endpoint or index of first array element + let last = arr.length - 1; // right endpoint or index of lat array element . + + while (first <= last) { + const middle = Math.floor((first + last) / 2); + if (arr[middle] == item) { + // If the element is present at the middle itself + return middle; + } else if (arr[middle] > item) { + // Ignore Right Half i.e. items after middle element . + last = middle - 1; + } else { + // Ignore Right Half i.e. items after middle element . + first = middle + 1; + } + } + return -1; // Item is not present in Array . +} + +// expected output = 1 +console.log(binarySearch(6, [2, 6, 8])); +// expected output = 2 +console.log(binarySearch(10, [2, 3, 10, 14])); +// expected output = -1 +console.log(binarySearch(1, [2, 6, 8])); diff --git a/algorithms/JavaScript/searching/linear-search.js b/algorithms/JavaScript/src/searching/linear-search.js similarity index 63% rename from algorithms/JavaScript/searching/linear-search.js rename to algorithms/JavaScript/src/searching/linear-search.js index 434e218f..1eed3b9b 100644 --- a/algorithms/JavaScript/searching/linear-search.js +++ b/algorithms/JavaScript/src/searching/linear-search.js @@ -1,9 +1,11 @@ -// Linear Search JavaScript Version: searches for a specific item in an array and returns the index of the item. +// Linear Search JavaScript Version: searches for a +// specific item in an array and returns the index of the item. function linearSearch(arr, x) { // Loop through the array for (let i = 0; i < arr.length; i++) { - // Checks if the item in the array = search item. If yes, return the index. If not, move to next item. + // Checks if the item in the array = search item. + // If yes, return the index. If not, move to next item. if (arr[i] === x) { return i; } diff --git a/algorithms/JavaScript/sorting/bubble-sort.js b/algorithms/JavaScript/src/sorting/bubble-sort.js similarity index 80% rename from algorithms/JavaScript/sorting/bubble-sort.js rename to algorithms/JavaScript/src/sorting/bubble-sort.js index 88c7661b..bc0cd2c4 100644 --- a/algorithms/JavaScript/sorting/bubble-sort.js +++ b/algorithms/JavaScript/src/sorting/bubble-sort.js @@ -2,11 +2,12 @@ function bubbleSort(arr) { // Copy the contents of the input array and store them as a separate variable - let sorted = [...arr]; + const sorted = [...arr]; // Loop through the copied array for (let i = 0; i < sorted.length; i++) { - // Checks if an item in the array is greater than the item next to it (index + 1) + // Checks if an item in the array is + // greater than the item next to it (index + 1) if (sorted[i] > sorted[i + 1]) { // If yes, swap them sorted.splice(i, 2, sorted[i + 1], sorted[i]); diff --git a/algorithms/JavaScript/src/sorting/insertion-sort.js b/algorithms/JavaScript/src/sorting/insertion-sort.js new file mode 100644 index 00000000..5837753b --- /dev/null +++ b/algorithms/JavaScript/src/sorting/insertion-sort.js @@ -0,0 +1,17 @@ +function insertionSort(array) { + // start with index 1 because only one element is already sorted + for (let i = 1; i < array.length; i++) { + const key = array[i]; + let j = i - 1; + // decrement j until array[j] is not less or equal to key + while (j >= 0 && array[j] > key) { + array[j + 1] = array[j]; + j--; + } + array[j + 1] = key; + } + return array; +} + +// output : [1,2,3,4,4,5,6,7,8,10] +console.log(insertionSort([4, 5, 6, 7, 8, 10, 1, 2, 3, 4])); diff --git a/algorithms/JavaScript/src/sorting/selection-sort.js b/algorithms/JavaScript/src/sorting/selection-sort.js new file mode 100644 index 00000000..b47d5894 --- /dev/null +++ b/algorithms/JavaScript/src/sorting/selection-sort.js @@ -0,0 +1,24 @@ +function selectionSort(array) { + // loop through all elements except last in array + for (let i = 0; i < array.length - 1; i++) { + let minIndex = i; + + // find minimum element index in unsorted array + for (let j = i + 1; j < array.length; j++) { + if (array[j] < array[i]) { + minIndex = j; + } + + // swap with element at minimum index + const temp = array[minIndex]; + array[minIndex] = array[i]; + array[i] = temp; + } + } + + // return sorted array + return array; +} + +// test +console.log(selectionSort([9, 8, 7, 6, 5, 4, 3, 2, 1, 0])); diff --git a/algorithms/JavaScript/src/strings/palindrome.js b/algorithms/JavaScript/src/strings/palindrome.js new file mode 100644 index 00000000..e1cdfea4 --- /dev/null +++ b/algorithms/JavaScript/src/strings/palindrome.js @@ -0,0 +1,22 @@ +// JavaScript Palindrome Checker: Checks whether a word is the same in reverse. +// Ignores punctuation, capitalization & spaces. + +function isPalindrome(str) { + // First convert the string into proper alphanumeric word + const properStr = str.replace(/[_\W]/g, '').toLowerCase(); + + // Now reverse the proper string + const reverseStr = properStr.split('').reverse().join(''); + + /* + * Finally compare the proper string and reverse string and + * return true or false + */ + return properStr === reverseStr; +} + +// Output to the console +console.log(isPalindrome('eye')); +console.log(isPalindrome('Mr. Owl ate my metal worm')); +console.log(isPalindrome('RAce C*_aR')); +console.log(isPalindrome('asdfggfrd')); diff --git a/algorithms/JavaScript/strings/sequence.js b/algorithms/JavaScript/src/strings/sequence.js similarity index 74% rename from algorithms/JavaScript/strings/sequence.js rename to algorithms/JavaScript/src/strings/sequence.js index ee1c6fd6..6c4d23eb 100644 --- a/algorithms/JavaScript/strings/sequence.js +++ b/algorithms/JavaScript/src/strings/sequence.js @@ -1,25 +1,15 @@ -var list = []; +let list = []; const subsequence = (input, output = '') => { - if (input === "") { - if (output !== '' && !list.includes(output)) list.push(output); - return; - } + if (input === '') { + if (output !== '' && !list.includes(output)) list.push(output); + return; + } - subsequence(input.substr(1), output + input.charAt(0)); - subsequence(input.substr(1), output); -} + subsequence(input.substr(1), output + input.charAt(0)); + subsequence(input.substr(1), output); +}; -subsequence('abc'); -console.log('abc', list); -list = []; - -subsequence('aaa'); -console.log('aaa', list); -list = []; - -subsequence('hello'); -console.log('hello', list); /* to run the file: @@ -42,3 +32,15 @@ console.log('hello', list); 'lo', 'l', 'o' ] */ + +subsequence('abc'); +console.log('abc', list); +list = []; + +subsequence('aaa'); +console.log('aaa', list); +list = []; + +subsequence('hello'); +console.log('hello', list); + diff --git a/algorithms/JavaScript/strings/palindrome.js b/algorithms/JavaScript/strings/palindrome.js deleted file mode 100644 index b61abe42..00000000 --- a/algorithms/JavaScript/strings/palindrome.js +++ /dev/null @@ -1,22 +0,0 @@ -// JavaScript Palindrome Checker: Checks whether a word is the same in reverse. Ignores punctuation, capitalization & spaces. - -function isPalindrome(str) { - // First convert the string into proper alphanumeric word - let properStr = str - .replace(/[_\W]/g, "") - .toLowerCase(); - - // Now reverse the proper string - let reverseStr = properStr - .split("") - .reverse() - .join(""); - - // Finally compare the proper string and reverse string and return true or false - return properStr === reverseStr; -} - -// Output to the console -console.log(isPalindrome("eye")); -console.log(isPalindrome("Mr. Owl ate my metal worm")); -console.log(isPalindrome("RAce C*_aR")); diff --git a/package-lock.json b/package-lock.json new file mode 100644 index 00000000..48e341a0 --- /dev/null +++ b/package-lock.json @@ -0,0 +1,3 @@ +{ + "lockfileVersion": 1 +}