回答編集履歴
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追記
test
CHANGED
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@@ -41,3 +41,49 @@
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);
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```
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49
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50
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51
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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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52
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```javascript
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(function(arr){
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return [
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[x, arr.reduce(function(sum, [k, v]){
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return sum += k==x ? v : 0;
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}, 0)]
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64
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for
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(x of new Set(
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[ k for each ([k, ] in arr ) ]
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))
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]
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})([
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["a",10],
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["b",20],
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["c",30],
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["a",40],
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["a",50]
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]);
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```
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