Gorbunov 251051

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.slice(7, -1);
 }
 
 
@@ -84,7 +84,7 @@ function extractNameFromTemplate(value) {
  *   'cat'       => 'c'
  */
 function getFirstChar(value) {
-    throw new Error('Not implemented');
+    return value[0];
 }
 
 /**
@@ -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.slice(1, -1);
 }
 
 
@@ -160,7 +160,7 @@ function unbracketTag(str) {
  *  'abcdefghijklmnopqrstuvwxyz' => 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
  */
 function convertToUpperCase(str) {
-    throw new Error('Not implemented');
+    return str.toUpperCase();
 }
 
 /**
@@ -174,7 +174,7 @@ function convertToUpperCase(str) {
  *   '[email protected]' => ['[email protected]']
  */
 function extractEmails(str) {
-    throw new Error('Not implemented');
+    return str.split(';');
 }
 
 /**
@@ -201,7 +201,10 @@ function extractEmails(str) {
  *
  */
 function getRectangleString(width, height) {
-    throw new Error('Not implemented');
+    const topLine = '┌' + '─'.repeat(width - 2) + '┐\n';
+    const middleLine = '│' + ' '.repeat(width - 2) + '│\n';
+    const bottomLine = '└' + '─'.repeat(width - 2) + '┘\n';
+    return topLine + middleLine.repeat(height - 2) + bottomLine;
 }
 
 
@@ -221,7 +224,10 @@ function getRectangleString(width, height) {
  *
  */
 function encodeToRot13(str) {
-    throw new Error('Not implemented');
+    const alpha = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
+    const flipped = 'NOPQRSTUVWXYZABCDEFGHIJKLMnopqrstuvwxyzabcdefghijklm';
+    return str.replace(/[a-z]/gi, letter => flipped[alpha.indexOf(letter)]);
+}
 }
 
 /**
@@ -238,7 +244,7 @@ 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 +273,12 @@ function isString(value) {
  *   'K♠' => 51
  */
 function getCardId(value) {
-    throw new Error('Not implemented');
+    const arr = ['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 arr.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.sqrt(Math.pow((x2 - x1), 2) + Math.pow((y2 - y1), 2));
 }
 
 /**
@@ -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 +111,17 @@ function getLinearEquationRoot(a, b) {
  *   (0,1) (1,2)     => 0
  */
 function getAngleBetweenVectors(x1, y1, x2, y2) {
-    throw new Error('Not implemented');
+    let angle = Math.atan2(x1, y1) - Math.atan2(x2, y2);
+
+    if (angle < 0) {
+        angle += 2 * Math.PI;
+    }
+
+    if (angle > Math.PI) {
+        angle -= 2 * Math.PI;
+    }
+
+    return angle;;
 }
 
 /**
@@ -127,7 +137,7 @@ function getAngleBetweenVectors(x1, y1, x2, y2) {
  *     0     => 0
  */
 function getLastDigit(value) {
-    throw new Error('Not implemented');
+    return value % 10;
 }
 
 
@@ -143,7 +153,7 @@ function getLastDigit(value) {
  * '-525.5'     => -525.5
  */
 function parseNumberFromString(value) {
-    throw new Error('Not implemented');
+    return +value;
 }
 
 /**
@@ -160,7 +170,7 @@ 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));
 }
 
 /**
@@ -181,7 +191,7 @@ 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);
 }
 
 /**
@@ -202,7 +212,13 @@ 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 true;
 }
 
 /**
@@ -221,7 +237,7 @@ function isPrime(n) {
  *   toNumber(new Number(42), 0) => 42
  */
 function toNumber(value, def) {
-    throw new Error('Not implemented');
+    return Number(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 +56,18 @@ function parseDataFromIso8601(value) {
  *    Date(2015,1,1)    => false
  */
 function isLeapYear(date) {
-   throw new Error('Not implemented');
+    const year = date.getFullYear();
+
+    if (year % 4 != 0) {
+        return false;
+    }
+    else if (year % 100 != 0) {
+        return true;
+    }
+    else if (year % 400 != 0) {
+        return false;
+    }
+    else return true;
 }
 
 
@@ -76,7 +87,12 @@ 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');
+    const rez = endDate - startDate;
+    let h = Math.trunc(rez / 3600000 % 100).toString().padStart(2, '0');
+    let m = Math.trunc(rez / 60000 % 60).toString().padStart(2, '0');
+    let s = Math.trunc(rez / 1000 % 60).toString().padStart(2, '0');
+    let ms = Math.trunc(rez % 1000).toString().padStart(3, '0');
+    return (h + ':' + m + ':' + s + '.' + ms);
 }
 
 
@@ -94,7 +110,15 @@ function timeSpanToString(startDate, endDate) {
  *    Date.UTC(2016,3,5,21, 0) => Math.PI/2
  */
 function angleBetweenClockHands(date) {
-    throw new Error('Not implemented');
+    let hours = date.getUTCHours();
+    let minutes = date.getUTCMinutes();
+    hours = (hours > 12 ? hours - 12 : hours);
+    let angle = Math.abs(0.5 * (60 * hours - 11 * minutes))
+
+    if (angle > 180) {
+        angle -= 180;
+    }
+    return angle * Math.PI / 180;
 }