回答編集履歴
1
reduce
answer
CHANGED
|
@@ -1,1 +1,13 @@
|
|
|
1
|
-
`singou[value]`
|
|
1
|
+
`singou[value]`
|
|
2
|
+
|
|
3
|
+
-- reduce
|
|
4
|
+
かぶりまけたので別解。宣言だけするのはムダ
|
|
5
|
+
|
|
6
|
+
```javascript
|
|
7
|
+
const singou = ["赤","青","黄"].reduce(function(previousValue, currentValue, index, array) {
|
|
8
|
+
previousValue[currentValue] = index;
|
|
9
|
+
return previousValue;
|
|
10
|
+
},{});
|
|
11
|
+
|
|
12
|
+
console.dir(singou)
|
|
13
|
+
```
|