回答編集履歴
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追記
answer
CHANGED
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@@ -19,4 +19,27 @@
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19
19
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["a",40],
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20
20
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["a",50]]
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21
21
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);
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22
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+
```
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23
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+
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24
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+
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25
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+
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26
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+
ついでにfirefoxじゃないと動かない書き方で。
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27
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+
```javascript
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28
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(function(arr){
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29
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return [
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30
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[x, arr.reduce(function(sum, [k, v]){
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31
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return sum += k==x ? v : 0;
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32
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}, 0)]
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33
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for
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34
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(x of new Set(
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35
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[ k for each ([k, ] in arr ) ]
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36
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))
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37
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]
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38
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})([
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39
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["a",10],
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40
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["b",20],
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41
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["c",30],
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42
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["a",40],
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43
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["a",50]
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44
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]);
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22
45
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```
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