Javascript - while vs do while loop

Have You ever wondered what is the difference between these two loops?

Here's the answer:

while (numOfCustomers > 0){
    console.log("How can I help you ?");
    
    // Help The Customers
    
    numOfCustomers = numOfCustomers - 1;
}

//vs

do{
    console.log("How can I help you ?");
    
    // Help The Customers

    numOfCustomers = numOfCustomers - 1;
}while(numOfCustomers >1)

The only difference between these loops is whether the conditional is tested before the first iteration (while) or after the first iteration (do .. while).

In either form, if the conditional test as false the next iteration will not run that means if the condition is initially false a (while) loop will never run but a (do..while) loop will run just the first time.