scripts.js

const employees = [
    {
        "code": "CT7207",
        "salary": 40000,
        "id": 1007,
        "job": "Manager",
        "department": "Operations",
        "name": "Bently Smith",
        "hobbies": ["Sports", "Reading", "Painting"]
    },
    {
        "code": "CT7210",
        "salary": 80000,
        "id": 1010,
        "job": "Director",
        "department": "Operations",
        "name": "Isla Morris",
        "hobbies": ["Sports", "Reading"]
    },
    {
        "code": "CT7202",
        "salary": 15000,
        "id": 1002,
        "job": "Salesman",
        "department": "Sales",
        "name": "Allen Green",
        "hobbies": ["Sports", "Painting"]
    },
    {
        "code": "CT7208",
        "salary": 60000,
        "id": 1008,
        "job": "Analyst",
        "department": "Research",
        "name": "Xavier Campbell",
        "hobbies": ["Reading", "Painting"]
    },
    {
        "code": "CT7209",
        "salary": 50000,
        "id": 1009,
        "job": "Analyst",
        "department": "Research",
        "name": "Ethan Kumar",
        "hobbies": ["Crafting", "Painting"]
    },
    {
        "code": "CT7201",
        "salary": 20000,
        "id": 1001,
        "job": "Clerk",
        "department": "Accounting",
        "name": "John Marshal",
        "hobbies": ["Singing", "Painting"]
    },
    {
        "code": "CT7205",
        "salary": 15000,
        "id": 1005,
        "job": "Salesman",
        "department": "Sales",
        "name": "Ethan Almaas",
        "hobbies": ["Singing", "Dancing"]
    },
    {
        "code": "CT7211",
        "salary": 15000,
        "id": 1011,
        "job": "Salesman",
        "department": "Sales",
        "name": "Natalie Robinson",
        "hobbies": ["Writing"]
    },
    {
        "code": "CT7212",
        "salary": 15000,
        "id": 1012,
        "job": "Salesman",
        "department": "Sales",
        "name": "Earl Rose",
        "hobbies": ["Singing", "Sports"]
    },
    {
        "code": "CT7206",
        "salary": 20000,
        "id": 1006,
        "job": "Clerk",
        "department": "Accounting",
        "name": "Ilija Seifert",
        "hobbies": ["Singing", "Cooking"]
    },
    {
        "code": "CT7204",
        "salary": 20000,
        "id": 1004,
        "job": "Clerk",
        "department": "Accounting",
        "name": "Annette Burke",
        "hobbies": ["Reading", "Teaching"]
    },
    {
        "code": "CT7203",
        "salary": 15000,
        "id": 1003,
        "job": "Salesman",
        "department": "Sales",
        "name": "Fernando Gordon",
        "hobbies": []
    },
    {
        "code": "CT7213",
        "salary": 15000,
        "id": 1013,
        "job": "Salesman",
        "department": "Sales",
        "name": "Catherine Foster",
        "hobbies": []
    }
];

// get employee with id 1003
let result = employees.find(i => i.id === 1003);
console.log('get employee with id 1003:', result);

// get index of an employee having id 1008
result = employees.findIndex(i => i.id === 1008);
console.log('get index of an employee having id 1008:', result);

// get salesman employees
result = employees.filter(i => i.job === 'Salesman');
console.log('get salesman employees:', result);

// get employees having salary greater than 40K
result = employees.filter(i => i.salary > 40000);
console.log('get employees having salary greater than 40K:', result);

// get number of employees having salary greater than 50K and from research department
result = employees.filter(i => i.salary > 50000 && i.department === 'Research');
console.log('get employees having salary greater than 50K and from research department:', result);

// get only name and salary of all employees
result = employees.map(i => ({ name: i.name, salary: i.salary }));
console.log('get only name and salary of all employees:', result);

// get only name, job and annual salary of all employees
result = employees.map(i => ({ name: i.name, job: i.job, annual: i.salary * 12 }));
console.log('get only name, job and annual salary of all employees:', result);

// get only first name and last name of all employees
result = employees.map(i => {
    const names = i.name.split(' ');
    return { firstName: names[0], lastName: names[1] };
});
console.log('get only first name and last name of all employees:', result);

// get name and salary of employees having salary greater than 10K but less than 20K ordered by name
result = employees
    .filter(i => i.salary > 10000 && i.salary < 20000)
    .map(i => ({ name: i.name, salary: i.salary }))
    .sort((emp1, emp2) => {
        const name1 = emp1.name.toLowerCase();
        const name2 = emp2.name.toLowerCase();

        if (name1 < name2) {
            return -1;
        } else if (name1 > name2)
            return 1;
        else return 0;
    });
console.log('get name and salary of employees having salary greater than 10K but less than 20K ordered by name:', result);

// return true if all employees having salary greater than 10K
// result = employees.filter(i => i.salary > 10000).length === employees.length;
result = employees.every(i => i.salary > 10000);
console.log('return true if all employees having salary greater than 10K:', result);

// return true if any employee is having salary greater than 60K
// result = employees.filter(i => i.salary > 60000).length > 0;
result = employees.some(i => i.salary > 60000);
console.log('return true if any employee is having salary greater than 60K:', result);

// get employees whose hobby is Reading
// result = employees.filter(i => i.hobbies.filter(hobby => hobby === 'Reading').length);
result = employees.filter(i => i.hobbies.some(hobby => hobby === 'Reading'));
console.log('get employees whose hobby is Reading:', result);

// get sum of all salaries
result = employees.map(i => i.salary).reduce((accumulator, currentValue) => currentValue + accumulator, 0);
console.log('get sum of all salaries:', result);

// get average of salary of employees
result = employees.map(i => i.salary).reduce((accumulator, currentValue) => currentValue + accumulator) / employees.length;
console.log('get average of salary of employees:', result);

// get max salary
result = Math.max(...employees.map(i => i.salary));
console.log('get max salary:', result);

// get min salary
result = Math.min(...employees.map(i => i.salary));
console.log('get min salary:', result);

// get all distinct job names
result = Array.from(new Set(employees.map(i => i.job)));
console.log('get all distinct job names:', result);

// get distinct hobbies
// result = Array.from(new Set(employees.map(i => i.hobbies).flat()));
result = Array.from(new Set(employees.flatMap(i => i.hobbies)));
console.log('get distinct hobbies:', result);

// get employee name and likes (hobbies). 
// The likes is a string as "Like hobby1/hobby2/hobby3". The likes will be created from hobbies array
result = employees.map(i => ({ name: i.name, likes: 'Likes ' + i.hobbies.join('/') }));
console.log('get employee name and likes:', result);

// remove employee having id 1010
const employeeIndex = employees.findIndex(i => i.id === 1010);
result = employees.splice(employeeIndex, 1);
console.log('remove employee having id 1010:', result);

// get sum of salary department wise
result = Array
    .from(new Set(employees.map(i => i.department)))
    .map(department => ({
        department,
        salary: employees
            .filter(i => i.department === department)
            .map(i => i.salary)
            .reduce((accumulator, currentValue) => currentValue + accumulator, 0)
    }));
console.log('get sum of salary department wise:', result);

// get employees name and code whose name starts with alphabet "e" (case insensitive)
result = employees.filter(i => i.name.toLowerCase().startsWith('e'));
console.log('get employees name and code whose name starts with alphabet "e":', result);

// get employees name and code whose name ends with alphabet "n" (case insensitive)
result = employees.filter(i => i.name.toLowerCase().endsWith('n'));
console.log('get employees name and code whose name ends with alphabet "n":', result);

// get employees name and code whose name have "tly"
result = employees.filter(i => i.name.toLowerCase().search('tly') !== -1);
console.log('get employees name and code whose name have "tly":', result);