diff --git a/.gitignore b/.gitignore
index 6eab170e5..396042c64 100644
--- a/.gitignore
+++ b/.gitignore
@@ -35,4 +35,4 @@ node_modules
 
 # Editors crap
 .vscode
-.idea
+.idea
\ No newline at end of file
diff --git a/.travis.yml b/.travis.yml
index 008cbc167..b0e500072 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,3 +1,3 @@
 language: node_js
 node_js:
-  - "5.10.0"
+  - "12.18.2"
diff --git a/README.md b/README.md
index 7036f25d7..c6b37f035 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,7 @@
 [![Brest Rolling Scopes](http://brest.rollingscopes.com/images/logo_rs_text.svg)](http://brest.rollingscopes.com/)
 #Brest Rolling Scopes School
-## Javascript Assignments  [![Build Status](https://travis-ci.org/AisBrestEDU/js-assignments.svg?branch=master)](https://travis-ci.org/AisBrestEDU/js-assignments)
+
+## Javascript Assignments  [![Build Status](https://travis-ci.org/Sergey-Starushkin/js-assignments.svg?branch=master)](https://travis-ci.org/Sergey-Starushkin/js-assignments)
 
 Yet another javascript assignments. There are a lot of interactive javascript resources for beginners, but most of them are online and do not cover the modern programming workflow. There are some excellent training resources on github (https://github.com/rmurphey/js-assessment, https://github.com/mrdavidlaing/javascript-koans, https://github.com/vasanthk/js-bits etc) but they are not exactly simulate the everyday programming process. So the motivation of this project is to show TDD process in the wild to the beginners. Assingment tests are implemented in various ways to feel a difference and gain the experience what manner is good, what is bad and what is ugly.
 
@@ -29,8 +30,7 @@ To start javascript assignments please follow the next steps:
   git commit -m "Update the links"
   git push origin master
 ```
-* Open https://github.com/AisBrestEDU/js-assignments and test the build icon. Now it will run all tests and update status once you push changes to github. Keep this icon green!
-
+* Open https://github.com/Sergey-Starushkin/js-assignments and test the build icon. Now it will run all tests and update status once you push changes to github. Keep this icon green!
 
 ### How to setup work environment
 * Download and install the latest [Nodejs](https://nodejs.org/en/download/stable/).
@@ -73,7 +73,8 @@ and run the unit tests again. Find one test failed (red). Now it's time to fix i
 * Implement the function by any way and verify your solution by running tests until the failed test become passed (green).
 * Your solution work, but now time to refactor it. Try to make your code as pretty and simple as possible keeping up the test green.
 * Once you can't improve your code and tests are passed you can commit your solution.
-* Push your updates to github server and check if tests passed on [travis-ci](https://travis-ci.org/AisBrestEDU/js-assignments/builds).
+* Push your updates to github server and check if tests passed on [travis-ci](https://travis-ci.org/Sergey-Starushkin/js-assignments/builds).
+
 * If everything is OK you can try to resolve the next task.
 
 ### How to debug tasks
diff --git a/package-lock.json b/package-lock.json
deleted file mode 100644
index c87f25cb9..000000000
--- a/package-lock.json
+++ /dev/null
@@ -1,2225 +0,0 @@
-{
-  "name": "js-training",
-  "version": "0.9.1",
-  "lockfileVersion": 1,
-  "requires": true,
-  "dependencies": {
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-      "dev": true,
-      "requires": {
-        "@babel/highlight": "^7.10.4"
-      }
-    },
-    "@babel/helper-validator-identifier": {
-      "version": "7.10.4",
-      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.10.4.tgz",
-      "integrity": "sha512-3U9y+43hz7ZM+rzG24Qe2mufW5KhvFg/NhnNph+i9mgCtdTCtMJuI1TMkrIUiK7Ix4PYlRF9I5dhqaLYA/ADXw==",
-      "dev": true
-    },
-    "@babel/highlight": {
-      "version": "7.10.4",
-      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.10.4.tgz",
-      "integrity": "sha512-i6rgnR/YgPEQzZZnbTHHuZdlE8qyoBNalD6F+q4vAFlcMEcqmkoG+mPqJYJCo63qPf74+Y1UZsl3l6f7/RIkmA==",
-      "dev": true,
-      "requires": {
-        "@babel/helper-validator-identifier": "^7.10.4",
-        "chalk": "^2.0.0",
-        "js-tokens": "^4.0.0"
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-        "camelcase": "^5.0.0",
-        "decamelize": "^1.2.0"
-      }
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-      "version": "1.6.0",
-      "resolved": "https://registry.npmjs.org/yargs-unparser/-/yargs-unparser-1.6.0.tgz",
-      "integrity": "sha512-W9tKgmSn0DpSatfri0nx52Joq5hVXgeLiqR/5G0sZNDoLZFOr/xjBUDcShCOGNsBnEMNo1KAMBkTej1Hm62HTw==",
-      "dev": true,
-      "requires": {
-        "flat": "^4.1.0",
-        "lodash": "^4.17.15",
-        "yargs": "^13.3.0"
-      }
-    }
-  }
-}
diff --git a/package.json b/package.json
index 1830b3015..5abbe0d45 100644
--- a/package.json
+++ b/package.json
@@ -3,7 +3,7 @@
   "version": "0.9.1",
   "description": "JS training tasks",
   "engines": {
-    "node": "^10.0.0"
+    "node": "^12.18.2"
   },
   "scripts": {
     "test": "./node_modules/.bin/mocha",
@@ -19,6 +19,6 @@
   },
   "repository": {
     "type": "git",
-    "url": "https://github.com/rolling-scopes-school/js-assignments.git"
+    "url": "https://github.com/Sergey-Starushkin/js-assignments.git"
   }
 }
diff --git a/task/01-strings-tasks.js b/task/01-strings-tasks.js
index e28054657..8ec725511 100644
--- a/task/01-strings-tasks.js
+++ b/task/01-strings-tasks.js
@@ -22,7 +22,7 @@
  *   '',  'bb'  => 'bb'
  */
 function concatenateStrings(value1, value2) {
-    throw new Error('Not implemented');
+    return value1+value2
 }
 
 
@@ -38,7 +38,7 @@ function concatenateStrings(value1, value2) {
  *   ''      => 0
  */
 function getStringLength(value) {
-    throw new Error('Not implemented');
+    return value.length
 }
 
 /**
@@ -55,7 +55,7 @@ function getStringLength(value) {
  *   'Chuck','Norris'  => 'Hello, Chuck Norris!'
  */
 function getStringFromTemplate(firstName, lastName) {
-    throw new Error('Not implemented');
+    return 'Hello, '+ firstName+' '+lastName+'!'
 }
 
 /**
@@ -69,7 +69,8 @@ function getStringFromTemplate(firstName, lastName) {
  *   'Hello, Chuck Norris!' => 'Chuck Norris'
  */
 function extractNameFromTemplate(value) {
-    throw new Error('Not implemented');
+  let value2 = value.replace("Hello, ",'')
+    return value2.replace("!",'')
 }
 
 
@@ -84,7 +85,7 @@ function extractNameFromTemplate(value) {
  *   'cat'       => 'c'
  */
 function getFirstChar(value) {
-    throw new Error('Not implemented');
+    return value.substr(0,1)
 }
 
 /**
@@ -99,7 +100,7 @@ function getFirstChar(value) {
  *   '\tHello, World! ' => 'Hello, World!'
  */
 function removeLeadingAndTrailingWhitespaces(value) {
-    throw new Error('Not implemented');
+    return  value.trim()
 }
 
 /**
@@ -114,7 +115,7 @@ function removeLeadingAndTrailingWhitespaces(value) {
  *   'cat', 3 => 'catcatcat'
  */
 function repeatString(value, count) {
-    throw new Error('Not implemented');
+    return value.repeat(count)
 }
 
 /**
@@ -130,7 +131,7 @@ function repeatString(value, count) {
  *   'ABABAB','BA' => 'ABAB'
  */
 function removeFirstOccurrences(str, value) {
-    throw new Error('Not implemented');
+    return  str.replace(value,'')
 }
 
 /**
@@ -145,7 +146,7 @@ function removeFirstOccurrences(str, value) {
  *   '<a>' => 'a'
  */
 function unbracketTag(str) {
-    throw new Error('Not implemented');
+    return str.slice(1,-1)
 }
 
 
@@ -160,7 +161,7 @@ function unbracketTag(str) {
  *  'abcdefghijklmnopqrstuvwxyz' => 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
  */
 function convertToUpperCase(str) {
-    throw new Error('Not implemented');
+    return str.toLocaleUpperCase()
 }
 
 /**
@@ -174,7 +175,7 @@ function convertToUpperCase(str) {
  *   'info@gmail.com' => ['info@gmail.com']
  */
 function extractEmails(str) {
-    throw new Error('Not implemented');
+    return str.split(";")
 }
 
 /**
@@ -201,7 +202,10 @@ function extractEmails(str) {
  *
  */
 function getRectangleString(width, height) {
-    throw new Error('Not implemented');
+    let tl = '┌' + '─'.repeat(width - 2) + '┐\n';
+    let ml = '│' + ' '.repeat(width - 2) + '│\n';
+    let dl = '└' + '─'.repeat(width - 2) + '┘\n';
+    return tl + ml.repeat(height - 2) + dl;
 }
 
 
@@ -221,7 +225,7 @@ function getRectangleString(width, height) {
  *
  */
 function encodeToRot13(str) {
-    throw new Error('Not implemented');
+    return str.replace(/[a-zA-Z]/g,function(c){return String.fromCharCode((c<="Z"?90:122)>=(c=c.charCodeAt(0)+13)?c:c-26);})
 }
 
 /**
@@ -238,7 +242,7 @@ function encodeToRot13(str) {
  *   isString(new String('test')) => true
  */
 function isString(value) {
-    throw new Error('Not implemented');
+    return Object.prototype.toString.call (value) === "[object String]"
 }
 
 
@@ -267,7 +271,11 @@ function isString(value) {
  *   'K♠' => 51
  */
 function getCardId(value) {
-    throw new Error('Not implemented');
+    let card = ['A♣','2♣','3♣','4♣','5♣','6♣','7♣','8♣','9♣','10♣','J♣','Q♣','K♣',
+                'A♦','2♦','3♦','4♦','5♦','6♦','7♦','8♦','9♦','10♦','J♦','Q♦','K♦',
+                'A♥','2♥','3♥','4♥','5♥','6♥','7♥','8♥','9♥','10♥','J♥','Q♥','K♥',
+                'A♠','2♠','3♠','4♠','5♠','6♠','7♠','8♠','9♠','10♠','J♠','Q♠','K♠']
+    return card.indexOf(value)
 }
 
 
diff --git a/task/02-numbers-tasks.js b/task/02-numbers-tasks.js
index c9ed20208..ba43a666f 100644
--- a/task/02-numbers-tasks.js
+++ b/task/02-numbers-tasks.js
@@ -22,7 +22,7 @@
  *   5, 5  => 25
  */
 function getRectangleArea(width, height) {
-    throw new Error('Not implemented');
+    return width*height
 }
 
 
@@ -38,7 +38,7 @@ function getRectangleArea(width, height) {
  *   0    => 0
  */
 function getCicleCircumference(radius) {
-    throw new Error('Not implemented');
+    return (Math.PI * radius)*2;
 }
 
 /**
@@ -54,7 +54,8 @@ function getCicleCircumference(radius) {
  *  -3, 3  => 0
  */
 function getAverage(value1, value2) {
-    throw new Error('Not implemented');
+
+    return (value1 / 2) + (value2 / 2)
 }
 
 /**
@@ -73,7 +74,7 @@ function getAverage(value1, value2) {
  *   (-5,0) (10,-10) => 18.027756377319946
  */
 function getDistanceBetweenPoints(x1, y1, x2, y2) {
-    throw new Error('Not implemented');
+    return Math.sqrt(Math.pow((x2-x1),2)+Math.pow((y2-y1),2))
 }
 
 /**
@@ -89,7 +90,15 @@ function getDistanceBetweenPoints(x1, y1, x2, y2) {
  *   5*x = 0         => 0
  */
 function getLinearEquationRoot(a, b) {
-    throw new Error('Not implemented');
+    let c = (b)/a
+    let z= (-b)/a
+    if(c!==(0)){
+        return z
+    }
+    if (c===(0))
+    {
+        return c
+    }
 }
 
 
@@ -111,7 +120,7 @@ function getLinearEquationRoot(a, b) {
  *   (0,1) (1,2)     => 0
  */
 function getAngleBetweenVectors(x1, y1, x2, y2) {
-    throw new Error('Not implemented');
+    return Math.acos(x1*x2+y1*y2)
 }
 
 /**
@@ -127,7 +136,7 @@ function getAngleBetweenVectors(x1, y1, x2, y2) {
  *     0     => 0
  */
 function getLastDigit(value) {
-    throw new Error('Not implemented');
+    return Math.floor((value / Math.pow(10, 1 - 1)) % 10)
 }
 
 
@@ -143,7 +152,7 @@ function getLastDigit(value) {
  * '-525.5'     => -525.5
  */
 function parseNumberFromString(value) {
-    throw new Error('Not implemented');
+    return Number(value)
 }
 
 /**
@@ -160,7 +169,7 @@ function parseNumberFromString(value) {
  *   1,2,3   => 3.741657386773941
  */
 function getParallelipidedDiagonal(a,b,c) {
-    throw new Error('Not implemented');
+    return Math.sqrt(Math.pow(a,2)+Math.pow(b,2)+Math.pow(c,2))
 }
 
 /**
@@ -169,7 +178,7 @@ function getParallelipidedDiagonal(a,b,c) {
  * @param {number} num
  * @param {number} pow
  * @return {number}
- *  
+ *
  * @example:
  *   1234, 0  => 1234
  *   1234, 1  => 1230
@@ -181,7 +190,7 @@ function getParallelipidedDiagonal(a,b,c) {
  *   1678, 3  => 2000
  */
 function roundToPowerOfTen(num, pow) {
-    throw new Error('Not implemented');
+    return Math.round(num/(Math.pow(10,pow)))*(Math.pow(10,pow))
 }
 
 /**
@@ -190,7 +199,7 @@ function roundToPowerOfTen(num, pow) {
  *
  * @param {number} n
  * @return {bool}
- * 
+ *
  * @example:
  *   4 => false
  *   5 => true
@@ -202,7 +211,22 @@ function roundToPowerOfTen(num, pow) {
  *   17 => true
  */
 function isPrime(n) {
-    throw new Error('Not implemented');
+    if (n < 2) {
+        return false
+    } else if (n === 2) {
+        return true;
+    }
+
+    let i = 2;
+    const limit = Math.sqrt(n);
+    while (i <= limit) {
+        if (n % i === 0) {
+            return false;
+        }
+        i +=1;
+    }
+
+    return true;
 }
 
 /**
@@ -221,7 +245,8 @@ function isPrime(n) {
  *   toNumber(new Number(42), 0) => 42
  */
 function toNumber(value, def) {
-    throw new Error('Not implemented');
+    if (parseInt(value,10)) { return parseInt(value,10); }
+    return def
 }
 
 module.exports = {
diff --git a/task/03-date-tasks.js b/task/03-date-tasks.js
index 83c6266bc..13cd9caab 100644
--- a/task/03-date-tasks.js
+++ b/task/03-date-tasks.js
@@ -22,7 +22,7 @@
  *    'Sun, 17 May 1998 03:00:00 GMT+01' => Date()
  */
 function parseDataFromRfc2822(value) {
-   throw new Error('Not implemented');
+   return Date.parse(value)
 }
 
 /**
@@ -37,7 +37,7 @@ function parseDataFromRfc2822(value) {
  *    '2016-01-19T08:07:37Z' => Date()
  */
 function parseDataFromIso8601(value) {
-   throw new Error('Not implemented');
+    return Date.parse(value)
 }
 
 
@@ -56,7 +56,9 @@ function parseDataFromIso8601(value) {
  *    Date(2015,1,1)    => false
  */
 function isLeapYear(date) {
-   throw new Error('Not implemented');
+   let year =new Date(date).getUTCFullYear()
+    return !(year % 4 !== 0 || year % 100 === 0 && year % 400 !== 0);
+
 }
 
 
@@ -76,7 +78,12 @@ function isLeapYear(date) {
  *    Date(2000,1,1,10,0,0),  Date(2000,1,1,15,20,10,453)   => "05:20:10.453"
  */
 function timeSpanToString(startDate, endDate) {
-   throw new Error('Not implemented');
+    let result = endDate-startDate
+    let hours=Math.floor(result/(60*60*1000))
+    let min=Math.floor((result%(60*60*1000))/(60*1000))
+    let second=Math.floor(((result%(60*60*1000))%(60*1000))/(1000))
+    let millisecond=Math.floor(((result%(60*60*1000))%(60*1000))%(1000))
+    return ''+hours.toString().padStart(2,"0")+':'+min.toString().padStart(2,"0")+':'+second.toString().padStart(2,"0")+'.'+millisecond.toString().padStart(3,"0")
 }
 
 
@@ -94,9 +101,30 @@ function timeSpanToString(startDate, endDate) {
  *    Date.UTC(2016,3,5,21, 0) => Math.PI/2
  */
 function angleBetweenClockHands(date) {
-    throw new Error('Not implemented');
+    let time=new Date(date)
+    let hours=time.getUTCHours()
+    if(hours>=12){hours=hours-12}
+    const minutes=time.getUTCMinutes()
+    let result=Math.abs(0.5 * ((60 * hours) - (11 * minutes)))
+    if(result>180){result=360-result}
+    return result*Math.PI/180
+}
+if (!String.prototype.padStart) {
+    String.prototype.padStart = function padStart(targetLength,padString) {
+        targetLength = targetLength>>0; //floor if number or convert non-number to 0;
+        padString = String(padString || ' ');
+        if (this.length > targetLength) {
+            return String(this);
+        }
+        // else {
+        //     targetLength = targetLength-this.length;
+        //     if (targetLength > padString.length) {
+        //         padString += padString.repeat(targetLength/padString.length); //append to original to ensure we are longer than needed
+        //     }
+        //     return padString.slice(0,targetLength) + String(this);
+        // }
+    };
 }
-
 
 module.exports = {
     parseDataFromRfc2822: parseDataFromRfc2822,
diff --git a/task/04-arrays-tasks.js b/task/04-arrays-tasks.js
index ff3a4c019..e5dbc5bbf 100644
--- a/task/04-arrays-tasks.js
+++ b/task/04-arrays-tasks.js
@@ -23,7 +23,7 @@
  *    [0, 1, 2, 3, 4, 5], 5    => 5
  */
 function findElement(arr, value) {
-   throw new Error('Not implemented');
+   return arr.findIndex(value1 => value1===value)
 }
 
 /**
@@ -38,7 +38,8 @@ function findElement(arr, value) {
  *    5 => [ 1, 3, 5, 7, 9 ]
  */
 function generateOdds(len) {
-   throw new Error('Not implemented');
+   return new Array(len).fill(0)
+       .map((_, i) => 2*i+1);
 }
 
 
@@ -54,7 +55,7 @@ function generateOdds(len) {
  *    [] => [] 
  */
 function doubleArray(arr) {
-   throw new Error('Not implemented');
+   return arr.concat(arr)
 }
 
 
@@ -70,7 +71,7 @@ function doubleArray(arr) {
  *    [] => [] 
  */
 function getArrayOfPositives(arr) {
-   throw new Error('Not implemented');
+  return arr.filter(ar=>ar>0)
 }
 
 /**
@@ -85,7 +86,15 @@ function getArrayOfPositives(arr) {
  *    [ 'cat, 'dog', 'raccon' ] => [ 'cat', 'dog', 'racoon' ]
  */
 function getArrayOfStrings(arr) {
-   throw new Error('Not implemented');
+   let result=[]
+   for (let i=0; i<arr.length; i++){
+      if (typeof arr[i]!=="string"){
+         continue;
+      } else {
+         result.push(arr[i])
+      }
+   }
+   return result
 }
 
 /**
@@ -102,7 +111,7 @@ function getArrayOfStrings(arr) {
  *    [ false, 0, NaN, '', undefined ]   => [ ]
  */
 function removeFalsyValues(arr) {
-   throw new Error('Not implemented');
+   return arr.filter(element => element);
 }
 
 /**
@@ -116,7 +125,8 @@ function removeFalsyValues(arr) {
  *    [ 'a', 'b', 'c', 'd', 'e', 'f', 'g' ]  => [ 'A', 'B', 'C', 'D', 'E', 'F', 'G' ]
  */
 function getUpperCaseStrings(arr) {
-   throw new Error('Not implemented');
+   let str=arr.toString()
+   return str.toUpperCase().split(',')
 }
 
 
@@ -131,7 +141,11 @@ function getUpperCaseStrings(arr) {
  *    [ 'angular', 'react', 'ember' ] => [ 7, 5, 5 ]
  */
 function getStringsLength(arr) {
-   throw new Error('Not implemented');
+   let result = [];
+   result = arr.map(function (len) {
+      return len.length
+   })
+   return result
 }
 
 /**
@@ -146,7 +160,7 @@ function getStringsLength(arr) {
  *    [ 1, 'b', 'c'], 0, 'x'  => [ 'x', 1, 'b', 'c' ]
  */
 function insertItem(arr, item, index) {
-   throw new Error('Not implemented');
+   return arr.splice(index,0,item)
 }
 
 /**
@@ -160,7 +174,7 @@ function insertItem(arr, item, index) {
  *    [ 'a', 'b', 'c', 'd'], 3  => [ 'a', 'b', 'c' ]
  */
 function getHead(arr, n) {
-   throw new Error('Not implemented');
+   return arr.slice(0,n)
 }
 
 
@@ -175,7 +189,7 @@ function getHead(arr, n) {
  *    [ 'a', 'b', 'c', 'd'], 3  => [ 'b', 'c', 'd' ]
  */
 function getTail(arr, n) {
-   throw new Error('Not implemented');
+   return arr.slice(arr.length-n)
 }
 
 
@@ -200,7 +214,7 @@ function getTail(arr, n) {
  *    +'30,31,32,33,34'
  */
 function toCsvText(arr) {
-   throw new Error('Not implemented');
+   return arr.join('\n')
 }
 
 /**
@@ -215,7 +229,9 @@ function toCsvText(arr) {
  *   [ 10, 100, -1 ]      => [ 100, 10000, 1 ]
  */
 function toArrayOfSquares(arr) {
-   throw new Error('Not implemented');
+   return arr.map(function (fx) {
+      return Math.pow(fx, 2)
+   })
 }
 
 
@@ -234,7 +250,13 @@ function toArrayOfSquares(arr) {
  *   [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ] => [ 1, 3, 6, 10, 15, 21, 28, 36, 45, 55 ]
  */
 function getMovingSum(arr) {
-   throw new Error('Not implemented');
+   let result =[]
+   let sum =0
+   for (let i=0;i<arr.length;i++){
+      sum += arr[i]
+      result.push(sum)
+   }
+   return result
 }
 
 /**
@@ -249,7 +271,14 @@ function getMovingSum(arr) {
  * [ "a" ] => []
  */
 function getSecondItems(arr) {
-   throw new Error('Not implemented');
+   let result=[]
+   for (let i=0;i<arr.length;i++) {
+      i++
+      if(i<arr.length) {
+         result.push(arr[i])
+      }
+   }
+   return result
 }
 
 
@@ -268,7 +297,13 @@ function getSecondItems(arr) {
  *  [ 1,2,3,4,5 ] => [ 1, 2,2, 3,3,3, 4,4,4,4, 5,5,5,5,5 ]
  */
 function propagateItemsByPositionIndex(arr) {
-   throw new Error('Not implemented');
+   const transform = arr => arr.reduce((a, item, i) => (
+       a.concat(Array.from(
+           { length: i + 1 },
+           () => item
+       ))
+   ), []);
+   return transform(arr)
 }
 
 
@@ -286,7 +321,8 @@ function propagateItemsByPositionIndex(arr) {
  *   [ 10, 10, 10, 10 ] => [ 10, 10, 10 ]
  */
 function get3TopItems(arr) {
-   throw new Error('Not implemented');
+   let reversed=arr.reverse()
+   return reversed.slice(0,3)
 }
  
  
@@ -304,7 +340,15 @@ function get3TopItems(arr) {
  *   [ 1, '2' ] => 1
  */
 function getPositivesCount(arr) {
-   throw new Error('Not implemented');
+   let result=0
+   for (let i = 0; i<arr.length;i++){
+      if (typeof (arr[i])==="string"){
+         i++
+      }else if (arr[i]>0){
+         result+=1
+      }
+   }
+   return result
 }
  
 /** 
@@ -321,7 +365,10 @@ function getPositivesCount(arr) {
  *   [ 'one','one','one','zero' ]     => [ 'zero','one','one','one' ]
  */
 function sortDigitNamesByNumericOrder(arr) {
-   throw new Error('Not implemented');
+   let element = ['zero', 'one', 'two', 'three', 'four', 'five', 'six', 'seven', 'eight', 'nine'];
+   return arr.sort((a, b) => {
+      return element.indexOf(a) - element.indexOf(b);
+   });
 }
 
 /** 
@@ -337,7 +384,11 @@ function sortDigitNamesByNumericOrder(arr) {
  *   [ 1, 10, 100, 1000 ]  => 1111
  */
 function getItemsSum(arr) {
-   throw new Error('Not implemented');
+   let sum = 0
+   for (let i = 0; i<arr.length;i++){
+      sum+=arr[i]
+   }
+   return sum
 }
  
 /** 
@@ -353,7 +404,7 @@ function getItemsSum(arr) {
  *  [ null, undefined, NaN, false, 0, '' ]  => 6
  */
 function getFalsyValuesCount(arr) {
-   throw new Error('Not implemented');
+   return arr.reduce((element1, element2) => element1 + (Boolean(element2) === false), 0);
 }
 
 /**
@@ -371,7 +422,7 @@ function getFalsyValuesCount(arr) {
  *    [ true, 0, 1, 'true' ], true => 1
  */
 function findAllOccurences(arr, item) {
-   throw new Error('Not implemented');
+   return arr.reduce((element1, element2) => element1 + (element2 === item), 0);
 }
 
 /**
@@ -386,7 +437,7 @@ function findAllOccurences(arr, item) {
  *    ['rock', 'paper', 'scissors']     => 'rock,paper,scissors'
  */
 function toStringList(arr) {
-   throw new Error('Not implemented');
+   return arr.toString()
 }
 
 
@@ -415,7 +466,7 @@ function toStringList(arr) {
  *      { country: 'Russia',  city: 'Saint Petersburg' }
  */
 function sortCitiesArray(arr) {
-   throw new Error('Not implemented');
+   return arr.sort((a, b) => a.country.localeCompare(b.country) || a.city.localeCompare(b.city));
 }
 
 /**
@@ -437,7 +488,11 @@ function sortCitiesArray(arr) {
  *           [0,0,0,0,1]]   
  */
 function getIdentityMatrix(n) {
-   throw new Error('Not implemented');
+   return Array.from({ length: n }, (element, index) => {
+      element = new Array(n).fill(0);
+      element[index] = 1;
+      return element;
+   });
 }
 
 /**
@@ -454,7 +509,11 @@ function getIdentityMatrix(n) {
  *     3, 3   => [ 3 ]
  */
 function getIntervalArray(start, end) {
-   throw new Error('Not implemented');
+   let arr=[]
+   for (let i = start; i <= end; i++) {
+      arr.push(i);
+   }
+   return arr
 }
 
 /**
@@ -469,7 +528,9 @@ function getIntervalArray(start, end) {
  *   [ 1, 1, 2, 2, 3, 3, 4, 4] => [ 1, 2, 3, 4]
  */
 function distinct(arr) {
-   throw new Error('Not implemented');
+   return arr.filter(function (itm, i, arr) {
+      return i === arr.indexOf(itm);
+   })
 }
 
 /**
@@ -503,7 +564,13 @@ function distinct(arr) {
  *   }
  */
 function group(array, keySelector, valueSelector) {
-   throw new Error('Not implemented');
+   let map = new Map();
+   array.map(element => {
+      let key = keySelector(element);
+      let value = valueSelector(element);
+      if (map.has(key)) map.get(key).push(value);else map.set(key, [value]);
+   });
+   return map;
 }
 
 
@@ -519,7 +586,7 @@ function group(array, keySelector, valueSelector) {
  *   ['one','two','three'], x=>x.split('')  =>   ['o','n','e','t','w','o','t','h','r','e','e']
  */
 function selectMany(arr, childrenSelector) {
-    throw new Error('Not implemented');
+   return arr.reduce((element, index) => element.concat(childrenSelector(index)), []);
 }
 
 
@@ -536,7 +603,8 @@ function selectMany(arr, childrenSelector) {
  *   [[[ 1, 2, 3]]], [ 0, 0, 1 ]      => 2        (arr[0][0][1])
  */
 function getElementByIndexes(arr, indexes) {
-    throw new Error('Not implemented');
+   indexes.map(element => arr = arr[element]);
+   return arr;
 }
 
 
@@ -559,7 +627,12 @@ function getElementByIndexes(arr, indexes) {
  * 
  */
 function swapHeadAndTail(arr) {
-    throw new Error('Not implemented');
+   let alen = arr.length;
+   let a = arr.length;
+   let head = arr.splice(0, alen / 2);
+   let tail;
+   if (a % 2 !== 0) tail = arr.splice(1, alen);else tail = arr.splice(0, alen);
+   return tail.concat(arr).concat(head);
 }