13 Function Features

Default parameters

in Java Script we will have to provide all the arguments/parameters while calling the function. The missing values are assigned with undefined. If we use in any calculation then its going to end up with NaN etc.

Without default parameter

const annualSalary = (sal,bonus) =>{
   return sal+bonus;
}
//If we call this, it will print NaN
//console.log(annualSalary(2000)); 

//This will work fine
console.log(annualSalary(2000,500));

With default parameter

const annualSalary = (sal,bonus=0) =>{
    return sal+bonus;
 }
 console.log(annualSalary(2000));
 console.log(annualSalary(2000,500));

With default object parameter

const annualSalary = (sal,bonus={
    teamBonus: 0,
    employeeBonus: 0
}) =>{
    return sal+bonus.teamBonus+bonus.employeeBonus;
 }

 console.log(22000,{teamBonus:1000,employeeBonus:200});