JavaScript完全ﾆﾘｶｲｼﾀ
$ node> [100, 100, 100, 100].map(parseInt)[ 100, NaN, 4, 9 ]
コールバック関数に余分な引数を渡すらしいんだよねhttps://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map#tricky_use_case
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