The LHS lookup is done when a variable appears on the left-hand side of the assignment operation, as in the var a = 2 example, where the LHS lookup is trying to find the variable container itself so it can assign. But the question is: to the side of what? To the side o f an assignment operation. Here the author introduces the concept of left-hand side (LHS) and right-hand side (RHS) lookups.
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