done

src/filtering.ts

@@ -10,9 +10,10 @@ const numbers = [10, 13, 20, 25, 38, 35, 40];
 // example:
 // greaterThanTwentyFive(numbers); // => [38, 35, 40]
 function greaterThanTwentyFive(numbers: number[]): number[] {
-  // write your code here...
+  return numbers.filter((number: number) => number >= 25);
 
-  return []; // replace empty array with what you see is fit
+  // write your code here...
+  // replace empty array with what you see is fit
 }
 
 // `divisibleByFive` function that:
@@ -23,7 +24,7 @@ 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((number: number) => number % 5 === 0); // replace empty array with what you see is fit
 }
 
 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((number: number) => number * number); // replace empty array with what you see is fit
 }
 
 // `doubledNumbers` function that:
@@ -23,7 +23,7 @@ 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((number: number) => number * 2); // replace empty array with what you see is fit
 }
 
 export { squaredNumbers, doubledNumbers };

src/mapping_filtering.ts

@@ -12,18 +12,28 @@ 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
+  // const numMap = numbers.filter((number: number) => number >= 20);
+  // const filterdMap = numMap.map((number: number) => number * number);
+  // return filterdMap;
+  return numbers
+    .filter((number: number) => number >= 20)
+    .map((number: number) => number * number);
+  // replace empty array with what you see is fit
 }
 
-// `filteredAndTripled` function that:
+// `filteredAnTripled` function that:
 // - Accepts "numbers" parameter of type "number[]".
 // - Return an array of numbers, where each number is tripled if it is divisible by 5.
 // example:
 // filteredAndTripled(numbers); // => [30, 60, 75, 105, 120]
 function filteredAndTripled(numbers: number[]): number[] {
   // write your code here...
 
-  return []; // replace empty array with what you see is fit
+  return numbers
+    .filter((number: number) => number % 5 === 0)
+    .map((number: number) => number * 3);
+
+  // replace empty array with what you see is fit
 }
 
 export { filteredAndSquared, filteredAndTripled };