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Add further append explanation #923

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Add further append explanation
Dava96 Sep 26, 2026
79c6b29
Add memory
Dava96 Sep 26, 2026
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3 changes: 3 additions & 0 deletions arrays-and-slices.md
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Expand Up @@ -373,6 +373,9 @@ func SumAll(numbersToSum ...[]int) []int {
In this implementation, we are worrying less about capacity. We start with an
empty slice `sums` and append to it the result of `Sum` as we work through the varargs.

However, If we were to pre-allocate the capacity of the slice using `make([]int, 0, lengthOfNumbers)`.
This would avoid unnecessary memory allocations due to the slice size already being known.

Our next requirement is to change `SumAll` to `SumAllTails`, where it will
calculate the totals of the "tails" of each slice. The tail of a collection is
all items in the collection except the first one \(the "head"\).
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