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Transfer practice · Sum dictionary values such as {wood=3,stone=2}. Do not rely on array length or ordered numeric keys.
v3 · Activity 1 of 1 · iteration · ipairs · pairs · 10 min Runs here
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Sum dictionary values such as {wood=3,stone=2}. Do not rely on array length or ordered numeric keys.
Interface: totalQuantity(items:{{quantity:number}}) -> number
| Input | Expected |
|---|---|
Named materials{ wood = 3, stone = 2 } | 5 |
No materials{} | 0 |
local counts = {2, 4, 1}
local total = 0
for _, count in ipairs(counts) do
total = total + count
end
return totalThe unused index is named _. The accumulator grows from 0 to 2 to 6 to 7.
New syntax: ipairs(), pairs(), for key, value in iterator do
ipairs visits a dense sequence in index order. In for index, item in ipairs(items) do, the second value is the item at the current index.
pairs visits keys and values in a table without promising a sorted order. Use it for named fields when order is irrelevant.
An accumulator begins at the neutral value, zero for addition. Update it for each item and return it only after the loop finishes.
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totalQuantityitems
total 0
_, item in items
total total item.quantity
total
totalQuantityThis is a private experiment copy. It does not replace your answer or complete the activity.
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