#1-4 Task. Roman Tarasenko

README.md

@@ -29,7 +29,7 @@ To start javascript assignments please follow the next steps:
   git commit -m "Update the links"
   git push origin master
 ```
-* Open https://github.com/rolling-scopes-school/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/RomanTarasenko/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
@@ -73,7 +73,7 @@ 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/rolling-scopes-school/js-assignments/builds).
+* Push your updates to github server and check if tests passed on [travis-ci](https://travis-ci.org/RomanTarasenko/js-assignments/builds).
 * If everything is OK you can try to resolve the next task.
 
 ### How to debug tasks

package.json

@@ -13,6 +13,6 @@
   },
   "repository" : {
     "type" : "git",
-    "url" : "https://github.com/rolling-scopes-school/js-assignments.git"
+    "url" : "https://github.com/RomanTarasenko/js-assignments.git"
   }
 }

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 +69,7 @@ function getStringFromTemplate(firstName, lastName) {
  *   'Hello, Chuck Norris!' => 'Chuck Norris'
  */
 function extractNameFromTemplate(value) {
-    throw new Error('Not implemented');
+    return value.substring(7,value.length-1);
 }
 
 
@@ -84,7 +84,7 @@ function extractNameFromTemplate(value) {
  *   'cat'       => 'c'
  */
 function getFirstChar(value) {
-    throw new Error('Not implemented');
+    return value.substring(0,1);
 }
 
 /**
@@ -99,7 +99,7 @@ function getFirstChar(value) {
  *   '\tHello, World! ' => 'Hello, World!'
  */
 function removeLeadingAndTrailingWhitespaces(value) {
-    throw new Error('Not implemented');
+    return value.trim();
 }
 
 /**
@@ -114,7 +114,7 @@ function removeLeadingAndTrailingWhitespaces(value) {
  *   'cat', 3 => 'catcatcat'
  */
 function repeatString(value, count) {
-    throw new Error('Not implemented');
+    return value.repeat(count);
 }
 
 /**
@@ -130,7 +130,7 @@ function repeatString(value, count) {
  *   'ABABAB','BA' => 'ABAB'
  */
 function removeFirstOccurrences(str, value) {
-    throw new Error('Not implemented');
+    return str.replace(value, "");
 }
 
 /**
@@ -145,7 +145,7 @@ function removeFirstOccurrences(str, value) {
  *   '<a>' => 'a'
  */
 function unbracketTag(str) {
-    throw new Error('Not implemented');
+    return str.replace(/[\<\>]+/g, "");
 }
 
 
@@ -160,7 +160,7 @@ function unbracketTag(str) {
  *  'abcdefghijklmnopqrstuvwxyz' => 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
  */
 function convertToUpperCase(str) {
-    throw new Error('Not implemented');
+    return str.toLocaleUpperCase();
 }
 
 /**
@@ -174,7 +174,7 @@ function convertToUpperCase(str) {
  *   '[email protected]' => ['[email protected]']
  */
 function extractEmails(str) {
-    throw new Error('Not implemented');
+    return str.split(";") ;
 }
 
 /**
@@ -201,7 +201,11 @@ function extractEmails(str) {
  *
  */
 function getRectangleString(width, height) {
-    throw new Error('Not implemented');
+    let top = `┌${'─'.repeat(width -2)}┐\n` ;
+    let side = `│${' '.repeat(width -2)}│\n`;
+    let bottom = `└${'─'.repeat(width -2)}┘\n`;
+
+    return top + side.repeat(height - 2) + bottom;
 }
 
 
@@ -221,7 +225,11 @@ function getRectangleString(width, height) {
  *
  */
 function encodeToRot13(str) {
-    throw new Error('Not implemented');
+  let input = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
+  let output = 'NOPQRSTUVWXYZABCDEFGHIJKLMnopqrstuvwxyzabcdefghijklm';
+  let index = x => input.indexOf(x);
+  let translate = x => index(x) > -1 ? output[index(x)] : x;
+  return str.split('').map(translate).join('');
 }
 
 /**
@@ -238,7 +246,14 @@ function encodeToRot13(str) {
  *   isString(new String('test')) => true
  */
 function isString(value) {
-    throw new Error('Not implemented');
+    let val;
+    if (typeof value === 'string') {
+        val = value;
+    }
+    if (typeof value === 'object' && value !== null && !Array.isArray(value)) {
+        val = value.valueOf()
+    }
+    return (typeof val === 'string')
 }
 
 
@@ -267,9 +282,15 @@ function isString(value) {
  *   'K♠' => 51
  */
 function getCardId(value) {
-    throw new Error('Not implemented');
-}
+    const cards = [
+        '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 cards.indexOf(value);
+}
 
 module.exports = {
     concatenateStrings: concatenateStrings,

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 2 * Math.PI * radius;
 }
 
 /**
@@ -54,7 +54,10 @@ function getCicleCircumference(radius) {
  *  -3, 3  => 0
  */
 function getAverage(value1, value2) {
-    throw new Error('Not implemented');
+    if (value1 === value2) {
+        return value1
+    }
+    return ((value1 + value2) / 2);
 }
 
 /**
@@ -73,7 +76,7 @@ function getAverage(value1, value2) {
  *   (-5,0) (10,-10) => 18.027756377319946
  */
 function getDistanceBetweenPoints(x1, y1, x2, y2) {
-    throw new Error('Not implemented');
+    return Math.sqrt(((x2-x1)*(x2-x1)) +((y2-y1)*(y2-y1)));
 }
 
 /**
@@ -89,7 +92,7 @@ function getDistanceBetweenPoints(x1, y1, x2, y2) {
  *   5*x = 0         => 0
  */
 function getLinearEquationRoot(a, b) {
-    throw new Error('Not implemented');
+    return ((-b)/a);
 }
 
 
@@ -111,7 +114,7 @@ function getLinearEquationRoot(a, b) {
  *   (0,1) (1,2)     => 0
  */
 function getAngleBetweenVectors(x1, y1, x2, y2) {
-    throw new Error('Not implemented');
+    return Math.abs(Math.atan(y1 / x1) - Math.atan(y2 / x2))
 }
 
 /**
@@ -127,7 +130,8 @@ function getAngleBetweenVectors(x1, y1, x2, y2) {
  *     0     => 0
  */
 function getLastDigit(value) {
-    throw new Error('Not implemented');
+    const lastChar = value.toString()[value.toString().length - 1];
+    return +lastChar;
 }
 
 
@@ -143,7 +147,7 @@ function getLastDigit(value) {
  * '-525.5'     => -525.5
  */
 function parseNumberFromString(value) {
-    throw new Error('Not implemented');
+    return +value
 }
 
 /**
@@ -160,7 +164,7 @@ function parseNumberFromString(value) {
  *   1,2,3   => 3.741657386773941
  */
 function getParallelipidedDiagonal(a,b,c) {
-    throw new Error('Not implemented');
+    return Math.sqrt((a*a + b*b) + c*c)
 }
 
 /**
@@ -181,7 +185,10 @@ function getParallelipidedDiagonal(a,b,c) {
  *   1678, 3  => 2000
  */
 function roundToPowerOfTen(num, pow) {
-    throw new Error('Not implemented');
+    if (pow === 0){
+        return num;
+    }
+    return Math.round(num/Math.pow(10, pow)) * Math.pow(10, pow);
 }
 
 /**
@@ -202,7 +209,12 @@ function roundToPowerOfTen(num, pow) {
  *   17 => true
  */
 function isPrime(n) {
-    throw new Error('Not implemented');
+    for(let i = 2; i < n; i++) {
+        if(n % i === 0) {
+            return false;
+        }
+    }
+    return n > 1;
 }
 
 /**
@@ -221,7 +233,10 @@ function isPrime(n) {
  *   toNumber(new Number(42), 0) => 42
  */
 function toNumber(value, def) {
-    throw new Error('Not implemented');
+    if (value !== null && Number.isInteger(+value)) {
+        return +value
+    }
+    return def;
 }
 
 module.exports = {

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 +56,14 @@ function parseDataFromIso8601(value) {
  *    Date(2015,1,1)    => false
  */
 function isLeapYear(date) {
-   throw new Error('Not implemented');
+   let year = date.getFullYear();
+   if (year % 400 === 0 || year % 100 !==0){
+      if (year % 4 ===0){
+         return true;
+      }
+   }
+   return false;
+
 }
 
 
@@ -76,7 +83,26 @@ 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 hours = (endDate.getDay() - startDate.getDay()) * 24 + endDate.getHours() - startDate.getHours();
+      if (hours < 10){
+         hours = '0' + hours;
+      }
+   let minutes = endDate.getMinutes() - startDate.getMinutes();
+      if (minutes < 10){
+         minutes = '0' + minutes;
+      }
+   let seconds = endDate.getSeconds() - startDate.getSeconds();
+      if (seconds < 10){
+         seconds = '0' + seconds;
+      }
+   let milliseconds = endDate.getMilliseconds() - startDate.getMilliseconds();
+      if (milliseconds < 100 && milliseconds >= 10){
+         milliseconds = '0' + milliseconds;
+      }
+      if (milliseconds < 10){
+         milliseconds = '00' + milliseconds
+      };
+   return `${hours}:${minutes}:${seconds}.${milliseconds}`;
 }
 
 
@@ -94,7 +120,11 @@ function timeSpanToString(startDate, endDate) {
  *    Date.UTC(2016,3,5,21, 0) => Math.PI/2
  */
 function angleBetweenClockHands(date) {
-    throw new Error('Not implemented');
+   const hour = date.getUTCHours() > 12 ? date.getUTCHours() - 12 : date.getUTCHours();
+   const minutes = date.getUTCMinutes() * 6;
+   const hours = 0.5 * (60 * hour + date.getUTCMinutes());
+   const angle = hours - minutes > 180 ? hours - minutes - 180 : hours - minutes;
+   return (Math.abs(angle) * Math.PI)/180;
 }