Невоструев ИПР1-2

package.json

@@ -11,8 +11,8 @@
   "devDependencies": {
     "mocha": "^2.3.4"
   },
-  "repository" : {
-    "type" : "git",
-    "url" : "https://github.com/rolling-scopes-school/js-assignments.git"
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/rolling-scopes-school/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+'!';
 }
 
 /**
@@ -69,10 +69,9 @@ function getStringFromTemplate(firstName, lastName) {
  *   'Hello, Chuck Norris!' => 'Chuck Norris'
  */
 function extractNameFromTemplate(value) {
-    throw new Error('Not implemented');
+    return value.slice(7, -1);
 }
 
-
 /**
  * Returns a first char of the given string.
  *
@@ -84,7 +83,7 @@ function extractNameFromTemplate(value) {
  *   'cat'       => 'c'
  */
 function getFirstChar(value) {
-    throw new Error('Not implemented');
+    return value[0];
 }
 
 /**
@@ -99,7 +98,7 @@ function getFirstChar(value) {
  *   '\tHello, World! ' => 'Hello, World!'
  */
 function removeLeadingAndTrailingWhitespaces(value) {
-    throw new Error('Not implemented');
+    return value.trim();
 }
 
 /**
@@ -114,7 +113,7 @@ function removeLeadingAndTrailingWhitespaces(value) {
  *   'cat', 3 => 'catcatcat'
  */
 function repeatString(value, count) {
-    throw new Error('Not implemented');
+    return value.repeat(count);
 }
 
 /**
@@ -130,7 +129,7 @@ function repeatString(value, count) {
  *   'ABABAB','BA' => 'ABAB'
  */
 function removeFirstOccurrences(str, value) {
-    throw new Error('Not implemented');
+    return str.replace(value, '');
 }
 
 /**
@@ -145,7 +144,7 @@ function removeFirstOccurrences(str, value) {
  *   '<a>' => 'a'
  */
 function unbracketTag(str) {
-    throw new Error('Not implemented');
+    return str.slice(1, str.length-1);
 }
 
 
@@ -160,7 +159,7 @@ function unbracketTag(str) {
  *  'abcdefghijklmnopqrstuvwxyz' => 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
  */
 function convertToUpperCase(str) {
-    throw new Error('Not implemented');
+    return str.toUpperCase();
 }
 
 /**
@@ -174,7 +173,7 @@ function convertToUpperCase(str) {
  *   '[email protected]' => ['[email protected]']
  */
 function extractEmails(str) {
-    throw new Error('Not implemented');
+    return str.split(';');
 }
 
 /**
@@ -201,7 +200,9 @@ function extractEmails(str) {
  *
  */
 function getRectangleString(width, height) {
-    throw new Error('Not implemented');
+    return '┌' + '─'.repeat(width - 2) + '┐\n' +
+        ('│' + ' '.repeat(width - 2) + '│\n').repeat(height - 2) +
+        '└' + '─'.repeat(width - 2) + '┘\n';
 }
 
 
@@ -221,7 +222,11 @@ function getRectangleString(width, height) {
  *
  */
 function encodeToRot13(str) {
-    throw new Error('Not implemented');
+    var input = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
+    var output = 'NOPQRSTUVWXYZABCDEFGHIJKLMnopqrstuvwxyzabcdefghijklm';
+    var index = x => input.indexOf(x);
+    var translate = x => index(x) > -1 ? output[index(x)] : x;
+    return str.split('').map(translate).join('');
 }
 
 /**
@@ -238,7 +243,7 @@ function encodeToRot13(str) {
  *   isString(new String('test')) => true
  */
 function isString(value) {
-    throw new Error('Not implemented');
+    return typeof value === 'string' || value instanceof String;
 }
 
 
@@ -267,7 +272,14 @@ 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);
 }
 
 

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 +54,7 @@ function getCicleCircumference(radius) {
  *  -3, 3  => 0
  */
 function getAverage(value1, value2) {
-    throw new Error('Not implemented');
+    return value1 / 2 + value2 / 2;
 }
 
 /**
@@ -73,7 +73,7 @@ function getAverage(value1, value2) {
  *   (-5,0) (10,-10) => 18.027756377319946
  */
 function getDistanceBetweenPoints(x1, y1, x2, y2) {
-    throw new Error('Not implemented');
+    return Math.hypot((x2 - x1), (y2 - y1));
 }
 
 /**
@@ -89,7 +89,7 @@ function getDistanceBetweenPoints(x1, y1, x2, y2) {
  *   5*x = 0         => 0
  */
 function getLinearEquationRoot(a, b) {
-    throw new Error('Not implemented');
+    return -b / a;
 }
 
 
@@ -111,7 +111,9 @@ 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) / (Math.sqrt(x1 * x1 + y1 * y1) * Math.sqrt(x2 * x2 + y2 * y2))
+    );
 }
 
 /**
@@ -127,7 +129,7 @@ function getAngleBetweenVectors(x1, y1, x2, y2) {
  *     0     => 0
  */
 function getLastDigit(value) {
-    throw new Error('Not implemented');
+    return value % 10;
 }
 
 
@@ -143,7 +145,7 @@ function getLastDigit(value) {
  * '-525.5'     => -525.5
  */
 function parseNumberFromString(value) {
-    throw new Error('Not implemented');
+    return Number.parseFloat(value);
 }
 
 /**
@@ -160,7 +162,7 @@ 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);
 }
 
 /**
@@ -169,7 +171,7 @@ function getParallelipidedDiagonal(a,b,c) {
  * @param {number} num
  * @param {number} pow
  * @return {number}
- *  
+ *
  * @example:
  *   1234, 0  => 1234
  *   1234, 1  => 1230
@@ -181,7 +183,7 @@ 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 +192,7 @@ function roundToPowerOfTen(num, pow) {
  *
  * @param {number} n
  * @return {bool}
- * 
+ *
  * @example:
  *   4 => false
  *   5 => true
@@ -202,7 +204,22 @@ function roundToPowerOfTen(num, pow) {
  *   17 => true
  */
 function isPrime(n) {
-    throw new Error('Not implemented');
+    if (n <= 1) {
+        return false;
+    } else if (n <= 3) {
+        return true;
+    } else if (!(n % 2) || !(n % 3)) {
+        return false;
+    }
+
+    let i = 5;
+    while (i * i <= n) {
+        if (!(n % i) || !(n % (i + 2))) {
+            return false;
+        }
+        i += 6;
+    }
+    return true;
 }
 
 /**
@@ -221,7 +238,7 @@ function isPrime(n) {
  *   toNumber(new Number(42), 0) => 42
  */
 function toNumber(value, def) {
-    throw new Error('Not implemented');
+    return +value ? +value : 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 new Date(value);
 }
 
 /**
@@ -37,7 +37,7 @@ function parseDataFromRfc2822(value) {
  *    '2016-01-19T08:07:37Z' => Date()
  */
 function parseDataFromIso8601(value) {
-   throw new Error('Not implemented');
+    return new Date(value);
 }
 
 
@@ -56,7 +56,9 @@ function parseDataFromIso8601(value) {
  *    Date(2015,1,1)    => false
  */
 function isLeapYear(date) {
-   throw new Error('Not implemented');
+    if ((date.getFullYear() % 4 == 0 && (date.getFullYear() % 100 != 0)) || date.getFullYear() % 400 == 0)
+        return true;
+    return false;
 }
 
 
@@ -76,14 +78,14 @@ 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');
+    return (new Date(endDate - startDate)).toISOString().slice(11, -1);
 }
 
 
 /**
  * Returns the angle (in radians) between the hands of an analog clock for the specified Greenwich time.
  * If you have problem with solution please read: https://en.wikipedia.org/wiki/Clock_angle_problem
- * 
+ *
  * @param {date} date
  * @return {number}
  *
@@ -94,7 +96,14 @@ function timeSpanToString(startDate, endDate) {
  *    Date.UTC(2016,3,5,21, 0) => Math.PI/2
  */
 function angleBetweenClockHands(date) {
-    throw new Error('Not implemented');
+    let h = new Date(date).getUTCHours();
+    h = h % 12;
+    let min = new Date(date).getUTCMinutes();
+    let angle = Math.abs(1/2 * (60 * h - 11 * min));
+    if (angle > 180) {
+        angle = (360 - angle);
+    }
+    return angle / 180 * Math.PI;
 }