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_/components/kaburi.jsx

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import { Component } from "react";
export default class extends Component {
render() {
const activity = this.props.activity.filter(a => a.ch === "kaburi");
const count = activity.length;
const time = activity
.map(a => a.endTime - a.startTime)
.reduce((a, c) => a + c, 0);
return (
<dl>
<dt>かぶり回数</dt>
<dd>{count}</dd>
<dt>かぶり時間 (ms)</dt>
<dd>{time}</dd>
</dl>
);
}
}