const array = [1, 2, 3]; const mappedArray = _.map(array, (num) => num * 2); console.log(mappedArray); // [2, 4, 6]
const array = [1, 2, 3, 4, 5]; const filteredArray = _.filter(array, (num) => num % 2 === 0); console.log(filteredArray); // [2, 4]
const students = [ { name: 'John', age: 23 }, { name: 'Jane', age: 21 }, { name: 'Bob', age: 23 }, ]; const groupedStudents = _.groupBy(students, 'age'); console.log(groupedStudents); // { // '21': [{ name: 'Jane', age: 21 }], // '23': [{ name: 'John', age: 23 }, { name: 'Bob', age: 23 }] // }Package library: Underscore.js