solutions

01_helloWorld/helloWorld.js

@@ -1,5 +1,5 @@
 const helloWorld = function() {
-  return ''
+  return 'Hello, World!'
 };
 
 module.exports = helloWorld;

02_repeatString/repeatString.js

@@ -1,5 +1,12 @@
-const repeatString = function() {
+const repeatString = function (word, num) {
-
+  let output = "";
+  for (i = 1; i <= num; i++) {
+    output += word;
+  }
+  if (num < 0) {
+    output = "ERROR";
+  }
+  return output;
 };
 
 // Do not edit below this line

02_repeatString/repeatString.spec.js

@@ -4,19 +4,19 @@ describe('repeatString', () => {
   test('repeats the string', () => {
     expect(repeatString('hey', 3)).toEqual('heyheyhey');
   });
-  test.skip('repeats the string many times', () => {
+  test('repeats the string many times', () => {
     expect(repeatString('hey', 10)).toEqual('heyheyheyheyheyheyheyheyheyhey');
   });
-  test.skip('repeats the string 1 times', () => {
+  test('repeats the string 1 times', () => {
     expect(repeatString('hey', 1)).toEqual('hey');
   });
-  test.skip('repeats the string 0 times', () => {
+  test('repeats the string 0 times', () => {
     expect(repeatString('hey', 0)).toEqual('');
   });
-  test.skip('returns ERROR with negative numbers', () => {
+  test('returns ERROR with negative numbers', () => {
     expect(repeatString('hey', -1)).toEqual('ERROR');
   });
-  test.skip('repeats the string a random amount of times', function () {
+  test('repeats the string a random amount of times', function () {
     /*The number is generated by using Math.random to get a value from between
     0 to 1, when this is multiplied by 1000 and rounded down with Math.floor it 
     equals a number between 0 to 999 (this number will change everytime you run
@@ -31,7 +31,7 @@ describe('repeatString', () => {
     was randomly generated. */
     expect(repeatString('hey', number).match(/((hey))/g).length).toEqual(number);
   });
-  test.skip('works with blank strings', () => {
+  test('works with blank strings', () => {
     expect(repeatString('', 10)).toEqual('');
   });
 });

03_reverseString/reverseString.js

@@ -1,5 +1,10 @@
-const reverseString = function() {
+const reverseString = function (word) {
-
+  let charArray = word.split("");
+  let revArray = [];
+  for (i = charArray.length - 1; i >= 0; i--) {
+    revArray.push(charArray[i]);
+  }
+  return revArray.join('')
 };
 
 // Do not edit below this line

03_reverseString/reverseString.spec.js

@@ -5,14 +5,14 @@ describe('reverseString', () => {
     expect(reverseString('hello')).toEqual('olleh');
   });
 
-  test.skip('reverses multiple words', () => {
+  test('reverses multiple words', () => {
     expect(reverseString('hello there')).toEqual('ereht olleh')
   })
 
-  test.skip('works with numbers and punctuation', () => {
+  test('works with numbers and punctuation', () => {
     expect(reverseString('123! abc!')).toEqual('!cba !321')
   })
-  test.skip('works with blank strings', () => {
+  test('works with blank strings', () => {
     expect(reverseString('')).toEqual('')
   })
 });

04_removeFromArray/removeFromArray.js

@@ -1,5 +1,13 @@
-const removeFromArray = function() {
+const removeFromArray = function (array, ...toRemove) {
+  let result = [...array];
 
+  for (i = 0; i < toRemove.length; i++) {
+    let index = result.indexOf(toRemove[i]);
+    if (index >= 0) {
+      result.splice(index, 1);
+    }
+  }
+  return result;
 };
 
 // Do not edit below this line

04_removeFromArray/removeFromArray.spec.js

@@ -4,22 +4,22 @@ describe('removeFromArray', () => {
   test('removes a single value', () => {
     expect(removeFromArray([1, 2, 3, 4], 3)).toEqual([1, 2, 4]);
   });
-  test.skip('removes multiple values', () => {
+  test('removes multiple values', () => {
     expect(removeFromArray([1, 2, 3, 4], 3, 2)).toEqual([1, 4]);
   });
-  test.skip('ignores non present values', () => {
+  test('ignores non present values', () => {
     expect(removeFromArray([1, 2, 3, 4], 7, "tacos")).toEqual([1, 2, 3, 4]);
   });
-  test.skip('ignores non present values, but still works', () => {
+  test('ignores non present values, but still works', () => {
     expect(removeFromArray([1, 2, 3, 4], 7, 2)).toEqual([1, 3, 4]);
   });
-  test.skip('can remove all values', () => {
+  test('can remove all values', () => {
     expect(removeFromArray([1, 2, 3, 4], 1, 2, 3, 4)).toEqual([]);
   });
-  test.skip('works with strings', () => {
+  test('works with strings', () => {
     expect(removeFromArray(["hey", 2, 3, "ho"], "hey", 3)).toEqual([2, "ho"]);
   });
-  test.skip('only removes same type', () => {
+  test('only removes same type', () => {
     expect(removeFromArray([1, 2, 3], "1", 3)).toEqual([1, 2]);
   });
 });

05_sumAll/sumAll.js

@@ -1,5 +1,18 @@
-const sumAll = function() {
+const sumAll = function (number1, number2) {
+  let number1State = !Number.isInteger(number1) || (number1 < 0);
+  let number2State = !Number.isInteger(number2) || (number2 < 0);
+  if (number1State || number2State) {
+    return "ERROR";
+  } else {
+    let max = number1 >= number2 ? number1 : number2;
+    let min = number1 >= number2 ? number2 : number1;
+    let result =0
 
+    for (i=min;i<=max;i++) {
+        result += i
+    }
+    return result
+}
 };
 
 // Do not edit below this line

05_sumAll/sumAll.spec.js

@@ -4,19 +4,19 @@ describe('sumAll', () => {
   test('sums numbers within the range', () => {
     expect(sumAll(1, 4)).toEqual(10);
   });
-  test.skip('works with large numbers', () => {
+  test('works with large numbers', () => {
     expect(sumAll(1, 4000)).toEqual(8002000);
   });
-  test.skip('works with larger number first', () => {
+  test('works with larger number first', () => {
     expect(sumAll(123, 1)).toEqual(7626);
   });
-  test.skip('returns ERROR with negative numbers', () => {
+  test('returns ERROR with negative numbers', () => {
     expect(sumAll(-10, 4)).toEqual('ERROR');
   });
-  test.skip('returns ERROR with non-number parameters', () => {
+  test('returns ERROR with non-number parameters', () => {
     expect(sumAll(10, "90")).toEqual('ERROR');
   });
-  test.skip('returns ERROR with non-number parameters', () => {
+  test('returns ERROR with non-number parameters', () => {
     expect(sumAll(10, [90, 1])).toEqual('ERROR');
   });
 });

06_leapYears/leapYears.js

@@ -1,5 +1,13 @@
-const leapYears = function() {
+const leapYears = function(year) {
-
+if (year % 400 == 0) {
+    return true
+} else if (year % 100 == 0) {
+    return false
+} else if (year % 4 ==0) {
+    return true
+} else {
+    return false
+}
 };
 
 // Do not edit below this line

06_leapYears/leapYears.spec.js

@@ -4,19 +4,19 @@ describe('leapYears', () => {
   test('works with non century years', () => {
     expect(leapYears(1996)).toBe(true);
   });
-  test.skip('works with non century years', () => {
+  test('works with non century years', () => {
     expect(leapYears(1997)).toBe(false);
   });
-  test.skip('works with ridiculously futuristic non century years', () => {
+  test('works with ridiculously futuristic non century years', () => {
     expect(leapYears(34992)).toBe(true);
   });
-  test.skip('works with century years', () => {
+  test('works with century years', () => {
     expect(leapYears(1900)).toBe(false);
   });
-  test.skip('works with century years', () => {
+  test('works with century years', () => {
     expect(leapYears(1600)).toBe(true);
   });
-  test.skip('works with century years', () => {
+  test('works with century years', () => {
     expect(leapYears(700)).toBe(false);
   });
 });

07_tempConversion/tempConversion.js

@@ -1,13 +1,15 @@
-const ftoc = function() {
+const ftoc = function (temp) {
-
+  let celcius = ((temp - 32) * 5) / 9;
+  return Number(celcius.toFixed(1));
 };
 
-const ctof = function() {
+const ctof = function (temp) {
-
+  let fahrenheit = (temp * 9) / 5 + 32;
+  return Number(fahrenheit.toFixed(1));
 };
 
 // Do not edit below this line
 module.exports = {
   ftoc,
-  ctof
+  ctof,
 };

07_tempConversion/tempConversion.spec.js

@@ -4,22 +4,22 @@ describe('ftoc', () => {
   test('works', () => {
     expect(ftoc(32)).toEqual(0);
   });
-  test.skip('rounds to 1 decimal', () => {
+  test('rounds to 1 decimal', () => {
     expect(ftoc(100)).toEqual(37.8);
   });
-  test.skip('works with negatives', () => {
+  test('works with negatives', () => {
     expect(ftoc(-100)).toEqual(-73.3);
   });
 });
 
 describe('ctof', () => {
-  test.skip('works', () => {
+  test('works', () => {
     expect(ctof(0)).toEqual(32);
   });
-  test.skip('rounds to 1 decimal', () => {
+  test('rounds to 1 decimal', () => {
     expect(ctof(73.2)).toEqual(163.8);
   });
-  test.skip('works with negatives', () => {
+  test('works with negatives', () => {
     expect(ctof(-10)).toEqual(14);
   });
 });

08_calculator/calculator.js

@@ -1,25 +1,44 @@
-const add = function() {
+const add = function (a, b) {
-	
+  let result = a + b;
+  return result;
 };
 
-const subtract = function() {
+const subtract = function (a, b) {
-	
+  let result = a - b;
+  return result;
 };
 
-const sum = function() {
+const sum = function (array) {
-	
+  let result = 0;
+  for (i = 0; i < array.length; i++) {
+    result += array[i];
+  }
+  return result;
 };
 
-const multiply = function() {
+const multiply = function (array) {
-
+  let result = 1;
+  for (i = 0; i < array.length; i++) {
+    result *= array[i];
+  }
+  return result;
 };
 
-const power = function() {
+const power = function (a, b) {
-	
+  let result = a ** b;
+  return result;
 };
 
-const factorial = function() {
+const factorial = function (val) {
-	
+  let result = 1;
+  if (val == 0) {
+    result = 1;
+  } else {
+    for (i = 1; i <= val; i++) {
+      result *= i;
+    }
+  }
+  return result;
 };
 
 // Do not edit below this line
@@ -29,5 +48,5 @@ module.exports = {
   sum,
   multiply,
   power,
-  factorial
+  factorial,
 };

08_calculator/calculator.spec.js

@@ -5,73 +5,73 @@ describe('add', () => {
 		expect(calculator.add(0,0)).toBe(0);
 	});
 
-	test.skip('adds 2 and 2', () => {
+	test('adds 2 and 2', () => {
 		expect(calculator.add(2,2)).toBe(4);
 	});
 
-	test.skip('adds positive numbers', () => {
+	test('adds positive numbers', () => {
 		expect(calculator.add(2,6)).toBe(8);
 	});
 });
 
 describe('subtract', () => {
-	test.skip('subtracts numbers', () => {
+	test('subtracts numbers', () => {
 		expect(calculator.subtract(10,4)).toBe(6);
 	});
 });
 
 describe('sum', () => {
-	test.skip('computes the sum of an empty array', () => {
+	test('computes the sum of an empty array', () => {
 		expect(calculator.sum([])).toBe(0);
 	});
 
-	test.skip('computes the sum of an array of one number', () => {
+	test('computes the sum of an array of one number', () => {
 		expect(calculator.sum([7])).toBe(7);
 	});
 
-	test.skip('computes the sum of an array of two numbers', () => {
+	test('computes the sum of an array of two numbers', () => {
 		expect(calculator.sum([7,11])).toBe(18);
 	});
 
-	test.skip('computes the sum of an array of many numbers', () => {
+	test('computes the sum of an array of many numbers', () => {
 		expect(calculator.sum([1,3,5,7,9])).toBe(25);
 	});
 });
 
 describe('multiply', () => {
-	test.skip('multiplies two numbers', () => {
+	test('multiplies two numbers', () => {
 		expect(calculator.multiply([2,4])).toBe(8);
 	});
 
-	test.skip('multiplies several numbers', () => {
+	test('multiplies several numbers', () => {
 		expect(calculator.multiply([2,4,6,8,10,12,14])).toBe(645120);
 	});
 });
 
 describe('power', () => {
-	test.skip('raises one number to the power of another number', () => {
+	test('raises one number to the power of another number', () => {
 		expect(calculator.power(4,3)).toBe(64); // 4 to third power is 64
 	});
 });
 
 describe('factorial', () => {
-	test.skip('computes the factorial of 0', () => {
+	test('computes the factorial of 0', () => {
 		expect(calculator.factorial(0)).toBe(1); // 0! = 1
 	});
 
-	test.skip('computes the factorial of 1', () => {
+	test('computes the factorial of 1', () => {
 		expect(calculator.factorial(1)).toBe(1);
 	});
 
-	test.skip('computes the factorial of 2', () => {
+	test('computes the factorial of 2', () => {
 		expect(calculator.factorial(2)).toBe(2);
 	});
 
-	test.skip('computes the factorial of 5', () => {
+	test('computes the factorial of 5', () => {
 		expect(calculator.factorial(5)).toBe(120);
 	});
 
-	test.skip('computes the factorial of 10', () => {
+	test('computes the factorial of 10', () => {
 		expect(calculator.factorial(10)).toBe(3628800);
 	});
 });

09_palindromes/palindromes.js

@@ -1,5 +1,42 @@
-const palindromes = function () {
+const palindromes = function (val) {
+  /*
+  let separatedBy = [" ", "!", ".", ","];
+  let separated;
+  let reversed;
+  let joined = val;
+  let removed
 
+  for (i = 0; i < separatedBy.length; i++) {
+    let temp = joined.split(separatedBy[i]);
+    joined = temp.join("");
+  }
+  removed = joined.split("");
+  for (i = removed.length - 1; i >= 0; i--) {
+    reversed.push(separated[i]);
+  }
+  if (separated === reversed) {
+    return true;
+  } else {
+    return false;
+  }
+  */
+  let separatedBy = [" ", "!", ".", ","];
+  let separated = val.toLowerCase().split("");
+  let reversed = [];
+
+  for (i = 0; i < separatedBy.length; i++) {
+    separated = separated.filter(function (d) {
+      return d != separatedBy[i];
+    });
+  }
+  for (i = separated.length - 1; i >= 0; i--) {
+    reversed.push(separated[i]);
+  }
+  if (separated.join("") === reversed.join("")) {
+    return true;
+  } else {
+    return false;
+  }
 };
 
 // Do not edit below this line

09_palindromes/palindromes.spec.js

@@ -4,19 +4,19 @@ describe('palindromes', () => {
   test('works with single words', () => {
     expect(palindromes('racecar')).toBe(true);
   });
-  test.skip('works with punctuation ', () => {
+  test('works with punctuation ', () => {
     expect(palindromes('racecar!')).toBe(true);
   });
-  test.skip('works with upper-case letters ', () => {
+  test('works with upper-case letters ', () => {
     expect(palindromes('Racecar!')).toBe(true);
   });
-  test.skip('works with multiple words', () => {
+  test('works with multiple words', () => {
     expect(palindromes('A car, a man, a maraca.')).toBe(true);
   });
-  test.skip('works with multiple words', () => {
+  test('works with multiple words', () => {
     expect(palindromes('Animal loots foliated detail of stool lamina.')).toBe(true);
   });
-  test.skip('doesn\'t just always return true', () => {
+  test('doesn\'t just always return true', () => {
     expect(palindromes('ZZZZ car, a man, a maracaz.')).toBe(false);
   });
 });

10_fibonacci/fibonacci.js

@@ -1,5 +1,22 @@
-const fibonacci = function() {
+const fibonacci = function (d) {
-
+  let order = +d;
+  if (order <= 0) {
+    return "OOPS";
+  } else {
+    if (order === 1) {
+      return 1;
+    } else {
+      let prev = 0;
+      let next = 1;
+      let result;
+      for (i = 2; i <= order; i++) {
+        result = prev + next;
+        prev = next;
+        next = result;
+      }
+      return result
+    }
+  }
 };
 
 // Do not edit below this line

10_fibonacci/fibonacci.spec.js

@@ -4,28 +4,28 @@ describe('fibonacci', () => {
   test('4th fibonacci number is 3', () => {
     expect(fibonacci(4)).toBe(3);
   });
-  test.skip('6th fibonacci number is 8', () => {
+  test('6th fibonacci number is 8', () => {
     expect(fibonacci(6)).toBe(8);
   });
-  test.skip('10th fibonacci number is 55', () => {
+  test('10th fibonacci number is 55', () => {
     expect(fibonacci(10)).toBe(55);
   });
-  test.skip('15th fibonacci number is 610', () => {
+  test('15th fibonacci number is 610', () => {
     expect(fibonacci(15)).toBe(610);
   });
-  test.skip('25th fibonacci number is 75025', () => {
+  test('25th fibonacci number is 75025', () => {
     expect(fibonacci(25)).toBe(75025);
   });
-  test.skip('doesn\'t accept negatives', () => {
+  test('doesn\'t accept negatives', () => {
     expect(fibonacci(-25)).toBe("OOPS");
   });
-  test.skip('DOES accept strings', () => {
+  test('DOES accept strings', () => {
     expect(fibonacci("1")).toBe(1);
   });
-  test.skip('DOES accept strings', () => {
+  test('DOES accept strings', () => {
     expect(fibonacci("2")).toBe(1);
   });
-  test.skip('DOES accept strings', () => {
+  test('DOES accept strings', () => {
     expect(fibonacci("8")).toBe(21);
   });
 });

11_getTheTitles/getTheTitles.js

@@ -1,5 +1,9 @@
-const getTheTitles = function() {
+const getTheTitles = function (array) {
-
+  let titles = [];
+  for (i = 0; i < array.length; i++) {
+    titles.push(array[i].title);
+  }
+  return titles
 };
 
 // Do not edit below this line

12_findTheOldest/findTheOldest.js

@@ -1,5 +1,21 @@
-const findTheOldest = function() {
+const findTheOldest = function (array) {
+    let resultYearOfDeath
 
+  let oldest = array.reduce(function (result, choice) {
+    if (result.yearOfDeath === undefined) {
+      let date = new Date();
+      resultYearOfDeath = date.getUTCFullYear();
+    } else {
+        resultYearOfDeath = result.yearOfDeath
+    }
+    let resultAge = resultYearOfDeath - result.yearOfBirth;
+    let choiceAge = choice.yearOfDeath - choice.yearOfBirth;
+
+    choiceAge > resultAge ? result = choice : result = result
+
+    return result;
+  });
+  return oldest
 };
 
 // Do not edit below this line

12_findTheOldest/findTheOldest.spec.js

@@ -21,7 +21,7 @@ describe('findTheOldest', () => {
     ]
     expect(findTheOldest(people).name).toBe('Ray');
   });
-  test.skip('finds the oldest person if someone is still living', () => {
+  test('finds the oldest person if someone is still living', () => {
     const people = [
       {
         name: "Carly",
@@ -40,7 +40,7 @@ describe('findTheOldest', () => {
     ]
     expect(findTheOldest(people).name).toBe('Ray');
   });
-  test.skip('finds the oldest person if the OLDEST is still living', () => {
+  test('finds the oldest person if the OLDEST is still living', () => {
     const people = [
       {
         name: "Carly",

13_caesar/caesar.js

@@ -1,5 +1,37 @@
-const caesar = function() {
+const caesar = function (str, encode) {
+  let arr = str.split("");
+  let arrToCode = arr.map(function (c) {
+    return c.charCodeAt();
+  });
 
+  encode = encode % 26;
+
+  let encodedArr = arrToCode.map(function (num) {
+    if (97 <= num && num <= 122) {
+      if (num + encode > 122) {
+        return 97 + (num + encode - 123);
+      } else if (num + encode < 97) {
+        return 122 + (num + encode - 96);
+      } else {
+        return num + encode;
+      }
+    } else if (65 <= num && num <= 90) {
+      if (num + encode > 90) {
+        return 65 + (num + encode - 91);
+      } else if (num + encode < 65) {
+        return 90 + (num + encode - 64);
+      } else {
+        return num + encode;
+      }
+    } else {
+      return num;
+    }
+  });
+  let encodedChar = encodedArr.map(function (d) {
+    return String.fromCharCode(d);
+  });
+
+  return encodedChar.join("");
 };
 
 // Do not edit below this line

13_caesar/caesar.spec.js

@@ -3,21 +3,21 @@ const caesar = require('./caesar')
 test('works with single letters', () => {
   expect(caesar('A', 1)).toBe('B');
 });
-test.skip('works with words', () => {
+test('works with words', () => {
   expect(caesar('Aaa', 1)).toBe('Bbb');
 });
-test.skip('works with phrases', () => {
+test('works with phrases', () => {
   expect(caesar('Hello, World!', 5)).toBe('Mjqqt, Btwqi!');
 });
-test.skip('works with negative shift', () => {
+test('works with negative shift', () => {
   expect(caesar('Mjqqt, Btwqi!', -5)).toBe('Hello, World!');
 });
-test.skip('wraps', () => {
+test('wraps', () => {
   expect(caesar('Z', 1)).toBe('A');
 });
-test.skip('works with large shift factors', () => {
+test('works with large shift factors', () => {
   expect(caesar('Hello, World!', 75)).toBe('Ebiil, Tloia!');
 });
-test.skip('works with large negative shift factors', () => {
+test('works with large negative shift factors', () => {
   expect(caesar('Hello, World!', -29)).toBe('Ebiil, Tloia!');
 });

package.json

@@ -14,11 +14,11 @@
   },
   "homepage": "https://github.com/TheOdinProject/javascript-exercises#readme",
   "devDependencies": {
-    "jest": "^26.6.3",
-    "jest-cli": "^26.6.3",
     "eslint": "^7.26.0",
     "eslint-config-airbnb-base": "^14.2.1",
-    "eslint-plugin-import": "^2.22.1"
+    "eslint-plugin-import": "^2.22.1",
+    "jest": "^26.6.3",
+    "jest-cli": "^26.6.3"
   },
   "scripts": {
     "test": "jest"
@@ -26,7 +26,7 @@
   "eslintConfig": {
     "root": true
   },
-   "jest": {
+  "jest": {
     "testPathIgnorePatterns": [
       "generator-exercise/"
     ]