JavaScript if/else Statement assign variable true or false

I believe I understand If/else statements using operators and numbers but I am not quite understanding it when it comes to a choice???

For example: I have two variables, lovesIcecream and typeOfIcecream. My goal is using an if/else statement, assign lovesIcecream to true if typeofIcecream is 'Chocolate', assign it to false if it is 'Vanilla'. This I have so far.

if(typeOfIcecream = ???) {
  lovesIcecream = true;
}else {
  lovesIcecream = false; 

I am not sure where to input 'Chocolate' and 'Vanilla' hence my question marks. I researched and studied javascript Control flow and if else statements by watching free videos online and it seems that I get the same examples which using numbers such as:

if(age >= 16) {
typeOfLicense = ('Full License')
}else {
typeOfLicense = ('None')
}

Anyways, If you can help me understand this and maybe suggest what I should be studying exactly to understand the 'typeOfIcecream' code better.