Declare loop variables once and only once

[edwingustafson]

Declare loop variables at first use. Do not redeclare on subsequent uses.

[scottleibrand]

Does this have any effect on whether the variables are reset for nested loops? Or is the presence or absence of var irrelevant for that?

[edwingustafson]

No effect since I find each for loop diligently assigning its own initial value.

(To avoid loop variable reuse, some or all of the loops could be rewritten using forEach and the other array methods that take a callback function. That way JavaScript function scope makes each pass a sealed unit.)