Solution

04_removeFromArray/removeFromArray.js

@@ -1,5 +1,8 @@
-const removeFromArray = function() {
+const removeFromArray = function(array, ...args) {
     
+    const newArray = [];
+
+    return array.filter(val => !args.includes(val));
 };
 
 // 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 +1,29 @@
-const sumAll = function() {
+const sumAll = function(first, second) {
     
+    if (first < 0 || second < 0) {
+        return 'ERROR';
+    } else if (!Number.isInteger(first)) {
+        return 'ERROR';
+    } else if (!Number.isInteger(second)) {
+        return 'ERROR';
+    } else if (first <= second){
+
+        let sum = 0;
+        
+        for (let i = first; i <= second; i++) {
+            sum += i;
+        }
+        return sum;
+
+    } else if (first > second) {
+
+        let sum = 0;
+        
+        for (let i = first; i >= second; i--) {
+            sum += i;
+        }
+        return sum;
+    }
 };
 
 // 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 +1,9 @@
-const leapYears = function() {
-
+const leapYears = function(year) {
+    if (year % 4 == 0 && year % 100 != 0 || year % 400 == 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

@@ -1,7 +1,17 @@
-const convertToCelsius = function() {
+const convertToCelsius = function(fahrenheit) {
+
+  let celsius = (fahrenheit - 32 ) * 5 / 9;
+  celsius = parseFloat(celsius.toFixed(1));
+  return celsius;
+
 };
 
-const convertToFahrenheit = function() {
+const convertToFahrenheit = function(celsius) {
+
+  let fahrenheit = (celsius * 9 / 5) + 32;
+  fahrenheit = parseFloat(fahrenheit.toFixed(1));
+  return fahrenheit;
+
 };
 
 // Do not edit below this line

07_tempConversion/tempConversion.spec.js

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

08_calculator/calculator.js

@@ -1,25 +1,73 @@
-const add = function() {
+const add = function(a, b) {
+
+	return a + b;
 
 };
 
-const subtract = function() {
+const subtract = function(a, b) {
+
+	return a - b;
 
 };
 
-const sum = function() {
+const sum = function(array) {
+
+	let suma = 0;
+
+  if (array.length == 0) {
+
+    return 0;
+
+  } else {
+
+    array.forEach(item => {
+      suma += item
+    });
+
+    return suma;
+  }
+};
+
+const multiply = function(array) {
+
+  let product = 1;
+
+  if (array.length == 0) {
+
+    return 0;
+
+  } else {
+
+    array.forEach(item => {
+      product *= item;
+    });
+    
+    return product;
+  }
 
 };
 
-const multiply = function() {
+const power = function(a, b) {
+
+	return Math.pow(a, b);
 
 };
 
-const power = function() {
+const factorial = function(a) {
 
-};
+	if (a < 0) {
 
-const factorial = function() {
+    return -1;
 
+  } else if (a == 0) {
+
+    return 1;
+
+  } else {
+
+    return a * factorial(a - 1);
+
+  }
 };
 
 // Do not edit below this line

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 +1,32 @@
-const palindromes = function () {
+const palindromes = function (string) {
     
+    const array = string.split("");
+    const newArray = [];
+    const reversedArray = [];
+    let newString = "";
+    let reversedString = "";
+
+    array.forEach(item => 
+        {
+            // verific daca este litera
+            if (item.toLowerCase() != item.toUpperCase()) {
+                newArray.push(item);
+                reversedArray.unshift(item);
+            }
+
+            newString = newArray.join("").toLowerCase();
+            reversedString = reversedArray.join("").toLowerCase();
+        });
+    
+    if (newString == reversedString) {
+
+        return true;
+
+    } else {
+
+        return false;
+
+    }
 };
 
 // Do not edit below this line

09_palindromes/palindromes.spec.js

@@ -4,22 +4,22 @@ 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);
   });
-  test.skip('works with numbers in a string', () => {
+  test('works with numbers in a string', () => {
     expect(palindromes('rac3e3car')).toBe(true);
   });
 });