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Ruby最大値(max)と最小値(min)の位置インデックス(index)を得る方法 ref: https://qiita.com/DrqYuto/items/4d4f0147659803e38d55
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| a=[1,2].each_with_index.max[1]+1 | |
| #=>2 | |
| a=[1,2].each_with_index.min[1]+1 | |
| =>1 |
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