JavaScript LHS and RHS Lookup

javascript lookup
ZIS picture ZIS · Apr 3, 2016 · Viewed 7.4k times · Source

I was reading the Scopes and Closure of You don't know JS book by Kyle Simpson, specifically this topic Compiler Speak.

There they mention the LHS and RHS lookup. I am failed to understand these two terms, can anyone help me to realize them?

Answer

Ahmed Eid picture Ahmed Eid · Sep 20, 2016

LHS look-up is done when a variable appears on the left-hand side of an assignment operation, and an RHS look-up is done when a variable appears on the right-hand side of an assignment operation.

I think of it as follows :
lhs lookup is a container lookup
rhs lookup is a value lookup

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