#22 - TypeScript

Author: Sac-Corts

Roadmap/22 - FUNCIONES DE ORDEN SUPERIOR/typescript/Sac-Corts.ts

@@ -0,0 +1,80 @@
+// Function that accepts another function as an argument 
+function processArray<T>(func: (item: T) => T, arr: T[]): T[] {
+    return arr.map(func);
+}
+
+function square(x: number): number {
+    return x * x;
+}
+
+const numbers: number[] = [1, 2, 3, 4];
+const squares: number[] = processArray(square, numbers);
+console.log(squares);
+
+// Function that returns another function
+function createSum(x: number): (y: number) => number {
+    return function(y: number): number {
+        return x + y;
+    };
+}
+
+const sum5 = createSum(5);
+console.log(sum5(20));
+
+// Using filter, map and reduce
+const numbers10: number[] = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
+const evenNumbers: number[] = numbers10.filter(num => num % 2 === 0);
+const evenSquares: number[] = evenNumbers.map(num => num * num); 
+const sumEvenSquares: number = evenSquares.reduce((total, num) => total + num, 0);
+
+console.log(evenNumbers);
+console.log(evenSquares);
+console.log(sumEvenSquares);
+
+// ** Extra Exercise ** //
+interface Student {
+    name: string;
+    birthdate: Date;
+    qualifications: number[];
+}
+
+const students: Student[] =  [{
+    name: 'Isaac',
+    birthdate: new Date(2001, 9, 21),
+    qualifications: [9.0, 10, 9.5, 9.8] 
+},
+{
+    name: 'Juan',
+    birthdate: new Date(2001, 6, 22),
+    qualifications: [9, 8, 8.5, 9.5]
+},
+{
+    name: 'Luis',
+    birthdate: new Date(2003, 10, 5),
+    qualifications: [6, 7, 7.5, 8]
+},
+{
+    name: 'María',
+    birthdate: new Date(2000, 4, 20),
+    qualifications: [10, 9.5, 10, 10]
+}]; 
+
+const studentAverage = students.map(student => {
+    const average = student.qualifications.reduce((sum, score) => sum + score, 0) / student.qualifications.length;
+    return { name: student.name, average: parseFloat(average.toFixed(2)) };
+});
+console.log(studentAverage);
+
+const bestStudents = studentAverage.filter(student => student.average >= 9);
+console.log(bestStudents);
+
+const datesOfBirthInOrder = students.sort((a, b) => b.birthdate.getTime() - a.birthdate.getTime());
+datesOfBirthInOrder.forEach(student => {
+    const date = student.birthdate;
+    console.log(`\n${student.name}: ${date.getFullYear()}-${date.getMonth() + 1}-${date.getDate()}`);
+});
+
+const allQualifications = students.flatMap(student => student.qualifications);
+const highestScore = Math.max(...allQualifications);
+
+console.log(`\nThe highest score is ${highestScore}`);