Do local variables inside of a loop get garbage collected?

Question

I\'m wondering if it is more efficient to place any vars referenced within a loop, outside of the loop - or can they get garbage collected like vars inside of a function?

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Answer 1

var is function scoped, not blocked scoped, so it does not matter whether they appear inside the loop or not. What is the scope of variables in JavaScript? explains this distinction.

The next version of JavaScript will have let-scoped variables and the value stored in those would become collectible at the end of a loop body run if declared inside the loop.