If you need to deallocate a value by unsetting it, you may consider `let` over `const`, but if you really need to micro-manage the garbage collector, you should probably watch “Slay’n the Waste Monster”, instead:
JavaScript ES6+: var, let, or const?
Eric Elliott

Optimizing in the wrong place is so common. It’s amazing how people won’t use `let` but they also don’t make use of more common optimizations that could easily replace the expense of `let`+ more.

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