solved

src/challenge.ts

@@ -1,5 +1,18 @@
 // 🌶️🌶️🌶️ Extra
 
+// let greaterThanTwentyFive = numbers.filter((number) => (number >= 25 ? true : false));
+
+// return greaterThanTwentyFive;
+
+// let squaredNumbers = numbers.map((number) => {
+//   return number ** 2;
+// });
+
+// return squaredNumbers;
+// const numbers: number[] = [1, 2, 3];
+// const strings: string[] = ["apple", "b", "c"];
+// type T = (numbers: number[], strings: string[]) => void;
+
 // `logger` function that:
 // - Accepts "array" parameter which holds elements of the same type
 // - log every element in an array
@@ -8,8 +21,19 @@
 // logger<number>([1, 2, 3]);
 // logger<number | string>([1, 2, 3, "one", "two", "three"]);
 function logger<T>(array: T[]): void {
-  // write your code here...
+	array.forEach((item) => console.log(item));
 }
+// 	let number = numbers.map((value) => {
+// 		console.log(value);
+
+logger([]);
+// function loggers<T>(array: T[]): void {
+// 	let string = strings.map((value) => {
+// 		console.log(value);
+// 	});
+// }
+
+// loggers(strings);
 
 // `toCelsius` function that:
 // - Accepts "temperatures" parameter of type "number[]", representing temperature values in Fahrenheit.
@@ -18,9 +42,9 @@ function logger<T>(array: T[]): void {
 // example:
 // toCelsius([32, 68, 100, 212]); // => [0, 20, 37.7778, 100]
 function toCelsius(temperatures: number[]): number[] {
-  // write your code here...
-
-  return []; // replace empty array with what you see is fit
+	// write your code here...
+	let conversion = temperatures.map((f) => (f - 32) * (5 / 9));
+	return conversion; // replace empty array with what you see is fit
 }
 
 // `hottestDays` function that:
@@ -31,17 +55,20 @@ function toCelsius(temperatures: number[]): number[] {
 // hottestDays([30, 40, 50, 60, 70], 45]); // => [50, 60, 70]
 // hottestDays([80, 90, 100, 110], 95); // => [100, 110]
 function hottestDays(temperatures: number[], threshold: number): number[] {
-  // write your code here...
-
-  return []; // replace empty array with what you see is fit
+	// write your code here...
+	let listOfHottestDays = temperatures.filter((temp) => temp > threshold);
+	return listOfHottestDays; // replace empty array with what you see is fit
 }
 
 // `logHottestDays` function that:
 // - Accepts "temperatures" parameter of type "number[]", representing temperature values in Fahrenheit.
 // - Accepts "threshold" parameter of type "number"
 // - Log temperatures that exceed the threshold to the console IN DEGREES CELSIUS  (hint: you can combine all previous functions)
 function logHottestDays(temperatures: number[], threshold: number): void {
-  // write your code here...
+	// write your code here...
+	const hotOnly = hottestDays(temperatures, threshold);
+	const converted = toCelsius(hotOnly);
+	logger(converted);
 }
 
 export { logger, toCelsius, hottestDays, logHottestDays };

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...
+	// write your code here...
+	let greaterThanTwentyFive = numbers.filter((number) => (number >= 25 ? true : false));
 
-  return []; // replace empty array with what you see is fit
+	return greaterThanTwentyFive; // replace empty array with what you see is fit
 }
 
 // `divisibleByFive` function that:
@@ -21,9 +22,10 @@ function greaterThanTwentyFive(numbers: number[]): number[] {
 // example:
 // divisibleByFive(numbers); // => [10, 20, 25, 35, 40]
 function divisibleByFive(numbers: number[]): number[] {
-  // write your code here...
+	// write your code here...
+	let divisibleByFive = numbers.filter((number) => (number % 5 === 0 ? true : false));
 
-  return []; // replace empty array with what you see is fit
+	return divisibleByFive; // replace empty array with what you see is fit
 }
 
 export { greaterThanTwentyFive, divisibleByFive };

src/mapping.ts

@@ -10,9 +10,12 @@ const numbers = [10, 13, 20, 25, 38, 35, 40];
 // example:
 // squaredNumbers(numbers); // => [100, 169, 400, 625, 1444, 1225, 1600]
 function squaredNumbers(numbers: number[]): number[] {
-  // write your code here...
+	// write your code here...
+	let squaredNumbers = numbers.map((number) => {
+		return number ** 2;
+	});
 
-  return []; // replace empty array with what you see is fit
+	return squaredNumbers; // replace empty array with what you see is fit
 }
 
 // `doubledNumbers` function that:
@@ -21,9 +24,12 @@ function squaredNumbers(numbers: number[]): number[] {
 // example:
 // doubledNumbers(numbers); // => [20, 26, 40, 50, 76, 70, 80]
 function doubledNumbers(numbers: number[]): number[] {
-  // write your code here...
+	// write your code here...
+	let doubledNumbers = numbers.map((number) => {
+		return number * 2;
+	});
 
-  return []; // replace empty array with what you see is fit
+	return doubledNumbers; // replace empty array with what you see is fit
 }
 
 export { squaredNumbers, doubledNumbers };

src/mapping_filtering.ts

@@ -10,9 +10,14 @@ const numbers = [10, 13, 20, 25, 38, 35, 40];
 // example:
 // filteredAndSquared(numbers); // => [400, 625, 1444, 1225, 1600]
 function filteredAndSquared(numbers: number[]): number[] {
-  // write your code here...
+	// write your code here...
+	let filtered = numbers.filter((number) => (number >= 20 ? true : false));
 
-  return []; // replace empty array with what you see is fit
+	let squared = filtered.map((number) => {
+		return number * number;
+	});
+
+	return squared; // replace empty array with what you see is fit
 }
 
 // `filteredAndTripled` function that:
@@ -21,9 +26,14 @@ function filteredAndSquared(numbers: number[]): number[] {
 // example:
 // filteredAndTripled(numbers); // => [30, 60, 75, 105, 120]
 function filteredAndTripled(numbers: number[]): number[] {
-  // write your code here...
+	// write your code here...
+	let filtered = numbers.filter((number) => (number % 5 === 0 ? true : false));
+
+	let squared = filtered.map((number) => {
+		return number * 3;
+	});
 
-  return []; // replace empty array with what you see is fit
+	return squared; // replace empty array with what you see is fit
 }
 
 export { filteredAndSquared, filteredAndTripled };