Primitive value types - String, Number, Boolean, Undefined, Null Reference value types - Object, Array, Function Callback function - A callback function is another function that is passed as an argument to another function, usually invoked after some event. Function expression - Declaring a function in the form of a var or const. Ex - const xxx = function () {}

It went well at first and the interviewers were excellent. The interviews went well, too. However, I never heard back from them. Not even a rejection. That said, the interviewers were great and if they like you, they'll try and find you a spot where you can fit in the company.