functionsArrayProblem.ts

const addName = (person: object): object => (
    {...person, name: 'John Doe'})
const addGender = (person: object): object => (
    {...person, gender: 'Male'})
const addJobTitle = (person: object): object => (
    {...person, title: 'Software Engineer'})
const addMonthlySalary = (person: object): object => (
    {...person, monthlySalary: 1000})
const addAnnualSalary = (person: object): object => (
    {...person, annualSalary: person['monthlySalary'] * 12})

const updateEmployee = (): object => {
    let employee: object = {
        id: 1,
        isActive: true,
    }
    employee = addName(employee)
    employee = addGender(employee)
    employee = addJobTitle(employee)
    employee = addMonthlySalary(employee)
    employee = addAnnualSalary(employee)
    return employee
}

console.log(updateEmployee())