To create an array of size n
and having null
values, you can use Array(n).fill(null)
function. It works in both Javascript and ReactJs. Check out this code example –
arrayOf9Values = Array(9).fill(null);
Example in React JS –
class Board extends React.Component {
constructor(props) {
super(props);
this.state = {
squares: Array(9).fill(null),
xIsNext: true,
};
}
Source: ReactJS Docs