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do you know how to solve the most notorious JavaScript interview question of all time so here we have a for loop from zero to three and inside of that Loop we set a timeout and end that timeout after 100 milliseconds we log out I and this is actually going to log out 333 so why does this happen well first of all set timeout has a function so this function creates a closure meaning that we keep access to this eye even after the for Loop completes because this function is going to run after that Loop completes however VAR is being used to declare I and VAR creates function scoped variables meaning we only get one eye for this entire for Loop so that I is updated each time and all of these different functions we create have closures with access to the same eye so they all log out great however if we used let instead of VAR we would get 0 1 and 2 because let is block scoped meaning we have a different I for each iteration through this for Loop and thus we have different eyes in each of the
