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An ECMAScript 2015 / Babel possibility is using a generator function to create an array of JSX:

function* jsxLoop(times, callback)
{
 for(var i = 0; i < times; ++i)
 yield callback(i);
}
...
<tbody>
 {[...jsxLoop(numrows, i =>
 <ObjectRow key={i}/>
 )]}
</tbody>