javascript_map.js

IN:
const employees = [
    {
        "name": "John Don't",
        "performance": "medium",
        "salary": 10000
    },
    {
        "name": "Jane Does",
        "performance": "high",
        "salary": 9000
    }
]

const adjust_salary = (employee) => {
    const brackets = {
        "high": 1.2,
        "medium": 1.03,
        "low": 1
    }
    const factor = brackets[employee.performance]
    const current_salary = employee.salary
    return {
        "name" : employee.name,
        "performance": employee.performance,
        "salary": current_salary * factor
    }
}
    
employees.map(employee => adjust_salary(employee))

OUT:
[
   {
      "name":"John Don't",
      "performance":"medium",
      "salary":10300.0
   },
   {
      "name":"Jane Does",
      "performance":"high",
      "salary":10800.0
   }
]