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hello in this video were going to talk about a simple idea but has docHub impact concerning lists and actually a collection of variables which I call the reference types so to help illustrate this were not going to talk about lists in Italy were gonna take a look at a simple simple function call and using an integer so just take an idea whats happening here we create a variable called num we print it and then we invoke some function called do something and what do something does is it takes the value of num and passes it into a and then a gets changed to 99 so when I print num again afterwards what happens is I get this and this sometimes causes some confusion because because people so well wait a second I pass this into the function Ive changed it to 99 so were going to draw a little picture here to make sure we understand whats happening so when we docHub line six what happens is a spaces in memory is created and its called num and the computer stores the value one insi