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Do you know JS array methods?
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Do you know JS array methods?
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JavaScript
data.js Raw #
const employees = [
{
id: 1,
first_name: 'Jan',
lastname: 'Novák',
age: 45,
salary: 85000,
role: 'CEO',
},
{
id: 2,
first_name: 'Marie',
lastname: 'Svobodová',
age: 32,
salary: 45000,
role: 'Developer',
},
{
id: 3,
first_name: 'Petr',
lastname: 'Dvořák',
age: 28,
salary: 65000,
role: 'Developer',
},
{
id: 4,
first_name: 'Lucie',
lastname: 'Černá',
age: 24,
salary: 35000,
role: 'Developer',
},
{
id: 5,
first_name: 'Tomáš',
lastname: 'Procházka',
age: 38,
salary: 55000,
role: 'Manager',
},
{
id: 6,
first_name: 'Eva',
lastname: 'Marková',
age: 29,
salary: 42000,
role: 'Designer',
},
{
id: 7,
first_name: 'Martin',
lastname: 'Kučera',
age: 35,
salary: 48000,
role: 'Manager',
},
{
id: 8,
first_name: 'Anna',
lastname: 'Veselá',
age: 26,
salary: 35000,
role: 'Support',
},
{
id: 9,
first_name: 'Jakub',
lastname: 'Horák',
age: 31,
salary: 65000,
role: 'Developer',
},
{
id: 10,
first_name: 'Tereza',
lastname: 'Pokorná',
age: 27,
salary: 38000,
role: 'Accountant',
},
{
id: 11,
first_name: 'David',
lastname: 'Král',
age: 33,
salary: 45000,
role: 'Developer',
},
{
id: 12,
first_name: 'Barbora',
lastname: 'Němcová',
age: 30,
salary: 42000,
role: 'Designer',
},
{
id: 13,
first_name: 'Milan',
lastname: 'Urban',
age: 42,
salary: 55000,
role: 'Manager',
},
{
id: 14,
first_name: 'Veronika',
lastname: 'Machová',
age: 25,
salary: 38000,
role: 'Designer',
},
{
id: 15,
first_name: 'Filip',
lastname: 'Sedláček',
age: 34,
salary: 48000,
role: 'Manager',
},
{
id: 16,
first_name: 'Kristýna',
lastname: 'Vacková',
age: 28,
salary: 42000,
role: 'HR',
},
{
id: 17,
first_name: 'Josef',
lastname: 'Malý',
age: 39,
salary: 55000,
role: 'Manager',
},
{
id: 18,
first_name: 'Kateřina',
lastname: 'Šimková',
age: 31,
salary: 45000,
role: 'Analyst',
},
{
id: 19,
first_name: 'Ondřej',
lastname: 'Beneš',
age: 36,
salary: 65000,
role: 'Developer',
},
{
id: 20,
first_name: 'Michaela',
lastname: 'Fialová',
age: 29,
salary: 42000,
role: 'Designer',
},
{
id: 21,
first_name: 'Pavel',
lastname: 'Bartoš',
age: 44,
salary: 55000,
role: 'Manager',
},
{
id: 22,
first_name: 'Lenka',
lastname: 'Kolářová',
age: 27,
salary: 38000,
role: 'Designer',
},
{
id: 23,
first_name: 'Roman',
lastname: 'Kovář',
age: 33,
salary: 45000,
role: 'Developer',
},
{
id: 24,
first_name: 'Martina',
lastname: 'Říhová',
age: 30,
salary: 48000,
role: 'Manager',
},
{
id: 25,
first_name: 'Lukáš',
lastname: 'Vlček',
age: 35,
salary: 65000,
role: 'Developer',
},
{
id: 26,
first_name: 'Adéla',
lastname: 'Tichá',
age: 26,
salary: 35000,
role: 'Support',
},
{
id: 27,
first_name: 'Vojtěch',
lastname: 'Havel',
age: 40,
salary: 55000,
role: 'Manager',
},
{
id: 28,
first_name: 'Simona',
lastname: 'Hrubá',
age: 32,
salary: 45000,
role: 'HR',
},
{
id: 29,
first_name: 'Robert',
lastname: 'Krátký',
age: 37,
salary: 65000,
role: 'Developer',
},
{
id: 30,
first_name: 'Monika',
lastname: 'Zelená',
age: 28,
salary: 45000,
role: 'Developer',
},
{
id: 31,
first_name: 'Karel',
lastname: 'Marek',
age: 41,
salary: 48000,
role: 'Analyst',
},
{
id: 32,
first_name: 'Petra',
lastname: 'Vávrová',
age: 29,
salary: 42000,
role: 'Support',
},
{
id: 33,
first_name: 'Adam',
lastname: 'Řezáč',
age: 34,
salary: 65000,
role: 'Developer',
},
{
id: 34,
first_name: 'Jana',
lastname: 'Holubová',
age: 31,
salary: 42000,
role: 'HR',
},
{
id: 35,
first_name: 'Miroslav',
lastname: 'Jelínek',
age: 43,
salary: 55000,
role: 'Manager',
},
{
id: 36,
first_name: 'Klára',
lastname: 'Štěpánková',
age: 27,
salary: 38000,
role: 'Support',
},
{
id: 37,
first_name: 'Daniel',
lastname: 'Doležal',
age: 36,
salary: 65000,
role: 'Developer',
},
{
id: 38,
first_name: 'Nikola',
lastname: 'Urbanová',
age: 30,
salary: 42000,
role: 'Designer',
},
{
id: 39,
first_name: 'Marek',
lastname: 'Šťastný',
age: 38,
salary: 48000,
role: 'Analyst',
},
{
id: 40,
first_name: 'Zuzana',
lastname: 'Kadlecová',
age: 29,
salary: 35000,
role: 'Support',
},
{
id: 41,
first_name: 'Jiří',
lastname: 'Moravec',
age: 45,
salary: 55000,
role: 'Manager',
},
{
id: 42,
first_name: 'Hana',
lastname: 'Beranová',
age: 33,
salary: 45000,
role: 'HR',
},
{
id: 43,
first_name: 'Michal',
lastname: 'Růžička',
age: 32,
salary: 65000,
role: 'Developer',
},
{
id: 44,
first_name: 'Andrea',
lastname: 'Kopecká',
age: 28,
salary: 38000,
role: 'Designer',
},
{
id: 45,
first_name: 'Radek',
lastname: 'Bureš',
age: 37,
salary: 48000,
role: 'Manager',
},
{
id: 46,
first_name: 'Denisa',
lastname: 'Havlíčková',
age: 26,
salary: 35000,
role: 'Support',
},
{
id: 47,
first_name: 'Patrik',
lastname: 'Pospíšil',
age: 34,
salary: 45000,
role: 'Developer',
},
{
id: 48,
first_name: 'Iveta',
lastname: 'Kratochvílová',
age: 31,
salary: 42000,
role: 'Designer',
},
{
id: 49,
first_name: 'Štěpán',
lastname: 'Janda',
age: 39,
salary: 65000,
role: 'Developer',
},
{
id: 50,
first_name: 'Gabriela',
lastname: 'Součková',
age: 30,
salary: 42000,
role: 'HR',
},
];
answers.js Raw #
// 1. Find the with id 20
// 2. Find all employees with role "Manager"
// 3. Check if there any employee with role "CEO"
// 4. Make sure that all employees are older than 18
// 5. Calculate the total wages we are paying the employees
// 6. How many employees each role has and what is the total wages paid for each role
// 7. Modify the items in the array to also include the full name of the employee
// 8. Say hello to each employeesolution.js Raw #
// 1. Find the with id 20
const employeeWithId20 = employees.find(employee => employee.id === 20);
console.log(employeeWithId20);
// 2. Find all employees with role "Manager"
const managers = employees.filter(employee => employee.role === 'Manager');
console.log(managers);
// 3. Check if there any employee with role "CEO"
const isAnyEmployeeCEO = employees.some(employee => employee.role === 'CEO');
console.log(isAnyEmployeeCEO);
// 4. Make sure that all employees are older than 18
const areAllEmployeesOlderThan18 = employees.every(employee => employee.age > 18);
console.log(areAllEmployeesOlderThan18);
// 5. Calculate the total wages we are paying the employees
const totalWages = employees.reduce((acc, employee) => acc + employee.salary, 0);
console.log(totalWages);
// 6. How many employees each role has and what is the total wages paid for each role
const roles = employees.reduce((acc, employee) => {
if (!acc[employee.role]) {
acc[employee.role] = { count: 0, salary: 0, avg: 0 };
}
acc[employee.role].count++;
acc[employee.role].salary += employee.salary;
acc[employee.role].avg = acc[employee.role].salary / acc[employee.role].count;
return acc;
}, {});
console.log(roles);
// 7. Modify the items in the array to also include the full name of the employee
const employeesWithFullName = employees.map(employee => ({
...employee,
fullName: `${employee.first_name} ${employee.lastname}`,
}));
console.log(employeesWithFullName);
// 8. Say hello to each employee
employeesWithFullName.forEach(employee => console.log(`Hello ${employee.fullName}`));