how to use loop in jsx code example

Example 1: react render for loop

// for loop workaround in react render
[...Array(n)].map((_, index) => <span key={index}>element {index}</span>)

Example 2: return jsx in for loop

var rows = [];
for (var i = 0; i < numrows; i++) {
    rows.push(ObjectRow());
}
return tbody(rows);