Undefined array

How would we use an undefined array as a crutch; that is, a size model for a whole series of arrays that might get generated to fit this profile?

 > a = new Array(10)
<- (10) [empty × 10]

How would Array.forEach() create another array with defined values given this array model?

Isn’t it abt that instance from Wanderlust?

Snippet

That is an identity which makes sense to declare as a constant.

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