done

src/challenge.ts

@@ -10,6 +10,7 @@
 function logger<T>(array: T[]): void {
   // write your code here...
 }
+console.log(logger);
 
 // `toCelsius` function that:
 // - Accepts "temperatures" parameter of type "number[]", representing temperature values in Fahrenheit.
@@ -20,7 +21,7 @@ function logger<T>(array: T[]): void {
 function toCelsius(temperatures: number[]): number[] {
   // write your code here...
 
-  return []; // replace empty array with what you see is fit
+  return temperatures.map((temp:number)=> temp= temperatures-32 8) ; // replace empty array with what you see is fit
 }
 
 // `hottestDays` function that:

src/filtering.ts

@@ -2,6 +2,7 @@
  * Use this array of numbers if you want to
  * manually test your functions
  */
+
 const numbers = [10, 13, 20, 25, 38, 35, 40];
 
 // `greaterThanTwentyFive` function that:
@@ -12,7 +13,7 @@ const numbers = [10, 13, 20, 25, 38, 35, 40];
 function greaterThanTwentyFive(numbers: number[]): number[] {
   // write your code here...
 
-  return []; // replace empty array with what you see is fit
+  return numbers.filter((grade: number) => grade >= 25); // replace empty array with what you see is fit
 }
 
 // `divisibleByFive` function that:
@@ -23,7 +24,9 @@ function greaterThanTwentyFive(numbers: number[]): number[] {
 function divisibleByFive(numbers: number[]): number[] {
   // write your code here...
 
-  return []; // replace empty array with what you see is fit
+  return numbers.filter((nums: number) => nums % 5 === 0); // replace empty array with what you see is fit
 }
+console.log(divisibleByFive(numbers));
+console.log(greaterThanTwentyFive(numbers));
 
 export { greaterThanTwentyFive, divisibleByFive };

src/mapping.ts

@@ -12,7 +12,7 @@ const numbers = [10, 13, 20, 25, 38, 35, 40];
 function squaredNumbers(numbers: number[]): number[] {
   // write your code here...
 
-  return []; // replace empty array with what you see is fit
+  return numbers.map((nums: number) => nums * nums); // replace empty array with what you see is fit
 }
 
 // `doubledNumbers` function that:
@@ -23,7 +23,9 @@ function squaredNumbers(numbers: number[]): number[] {
 function doubledNumbers(numbers: number[]): number[] {
   // write your code here...
 
-  return []; // replace empty array with what you see is fit
+  return numbers.map((num: number) => num * 2); // replace empty array with what you see is fit
 }
+console.log(squaredNumbers(numbers));
+console.log(doubledNumbers(numbers));
 
 export { squaredNumbers, doubledNumbers };

src/mapping_filtering.ts

@@ -12,7 +12,9 @@ const numbers = [10, 13, 20, 25, 38, 35, 40];
 function filteredAndSquared(numbers: number[]): number[] {
   // write your code here...
 
-  return []; // replace empty array with what you see is fit
+  return numbers
+    .filter((numd: number) => numd >= 20)
+    .map((numd: number) => numd * numd); // replace empty array with what you see is fit
 }
 
 // `filteredAndTripled` function that:
@@ -23,7 +25,11 @@ function filteredAndSquared(numbers: number[]): number[] {
 function filteredAndTripled(numbers: number[]): number[] {
   // write your code here...
 
-  return []; // replace empty array with what you see is fit
+  return numbers
+    .filter((num: number) => num % 5 === 0)
+    .map((num: number) => num * 3); // replace empty array with what you see is fit
 }
+console.log(filteredAndSquared(numbers));
+console.log(filteredAndTripled(numbers));
 
 export { filteredAndSquared, filteredAndTripled };